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UEI30 Series
30W Isolated Wide-Range DC/DC Converters
Featuring a full 30 Watt output in 1.8 square inches of board area, the UEI series isolated DC/DC converter family offers efficient regulated DC power for printed circuit board mounting.
PRODUCT OVERVIEW
Wide range 4:1 inputs on the 0.92" x 1.92" x 0.35" converter are either 9 to 36 Volts DC (Q12 models) or 18 to 75 Volts DC (Q48 models), ideal for battery-powered and telecom equipment. Fixed output voltages from 3.3 VDC to 15 VDC are tightly regulated and may be trimmed within 10% of nominal output. Applications include small instruments, computer-based systems, data communications equipment, remote sensor systems, vehicle and portable electronics. The UEI 30W Series includes full magnetic and optical isolation up to 2250 Volts DC (basic insulation). For connection to digital systems, the outputs offer fast settling to current step loads and tolerance of higher capacitive loads. Excellent ripple and noise specifications assure compatibility to circuits using CPU's, ASIC's, programmable logic and FPGA's. No minimum load is required. For systems requiring controlled startup/shutdown, an external switch, transistor or digital logic may be used to activate the remote On/Off control. Remote Sense inputs compensate for resistive line drops at high currents. A wealth of self-protection features avoid both converter and external circuit problems. These include input undervoltage lockout and overtemperature shutdown. The outputs current limit using the "hiccup" autorestart technique and the outputs may be short-circuited indefinitely. Additional features include output overvoltage and reverse conduction elimination. The synchronous rectifier forward topology offers high efficiency for minimal heat buildup and "no fan" operation. The open frame design is also available under special quantity order with an encapsulation shell and thermallyconductive potting compound. This option offers additional cooling in low-airflow, high temperature applications.
Typical unit
FEATURES
Small footprint DC/DC converter, ideal for high current applications 0.92" x 1.92" x 0.35" open frame package Wide range input voltages 9-36 and 18-75Vdc Double lead-free assembly and attachment for RoHS standards Isolation up to 2250 VDC (basic) Up to 30W total output power with overtemperature shutdown High efficiency synchronous rectifier forward topology Stable no-load operation with no required external components -40 to +85C temperature range with derating Designed to meet UL60950-1, CSA-C22.2 No. 234, EN60950-1 safety approvals Extensive self-protection shut down features RoHS hazardous substance compliant
SIMPLIFIED SCHEMATIC
+VOUT +VIN GATE DRIVE
-VIN
-VOUT ISOLATION BARRIER
On/Off Control
Control
OPTO ISOLATION
Reference, trim & Error Amplifier
TRIM
Typical topology is shown.
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MDC_UEI Series 30W.A01 Page 1 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE Output Power R/N (mVp-p) Regulation (Max.) VIN VOUT IOUT Nom. (V) (A) (W) Typ. Max. Line Load (V) Root Modelc UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C 3.3 3.3 5 5 12 12 15 15 9 9 6 6 2.5 2.5 2 2 29.7 29.7 30 30 30 30 30 30 Please contact Murata Power Solutions for further information. 25 50 0.1% 0.1% Please contact Murata Power Solutions for further information. 24 48 24 48 24 48 24 48 Input Range (V) 9-36 18-75 9-36 18-75 9-36 18-75 9-36 18-75 Please contact Murata Power Solutions for further information. 130 0.70 87.9% 89% Please contact Murata Power Solutions for further information. IIN, IIN, full no load load (A) (mA) Efficiency Min. Typ.
Open Frame Package, C80 Case (inches) 0.92x1.92x0.35 0.92x1.92x0.35 0.92x1.92x0.35 0.92x1.92x0.35 0.92x1.92x0.35 0.92x1.92x0.35 0.92x1.92x0.35 0.92x1.92x0.35 Pinout P21 P21 P21 P21 P21 P21 P21 P21
c Please refer to the part number structure for additional options and complete ordering part numbers. d All specifications are at nominal line voltage and full load, +25 deg.C. unless otherwise noted. See detailed specifications.
Output capacitors are 1 F ceramic in parallel with 10 F electrolytic. Input cap is 22 F, low ESR. These I/O caps are necessary for our test equipment and may not be needed for your application. e Sense input is not included for 12 Vout and higher models. Sense is optional for 5 Vout and lower.
PART NUMBER STRUCTURE
UEI30 - 050 - Q48 N - C
RoHS-6 hazardous substancecompliance Nominal Output Voltage In tenths of a volt Note: Not all model number combinations are available. Contact Murata Power Solutions. On/Off Control Polarity: P = Positive N = Negative Positive "P" polarity is standard for Q12 models and optional special order for Q48 models. Negative "N" polarity is standard for Q48 models and optional special order for Q12 models.
Input Voltage Range: Q12 = 9-36V Q48 = 18-75V
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Be cautious when there is high atmospheric humidity. We strongly recommend a mild pre-bake (100 C. for 30 minutes). Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders: Maximum Preheat Temperature Maximum Pot Temperature Maximum Solder Dwell Time 115 C. 270 C. 7 seconds
For Sn/Pb based solders: Maximum Preheat Temperature Maximum Pot Temperature Maximum Solder Dwell Time 105 C. 250 C. 6 seconds
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MDC_UEI Series 30W.A01 Page 2 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
MECHANICAL SPECIFICATIONS
INPUT/OUTPUT CONNECTIONS
Pin 1 2 3
Function P21 + Vin - Vin Remote On/Off*
Pin 4 5 6
Function P21 + Vout - Vout Trim
* The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) polarity.
PHYSICAL CHARACTERISTICS Outline dimensions Pin material Pin diameter Pin Finish Weight Electromagnetic interference Flammability Rating Safety See mechanical specs Copper alloy with gold plate over nickel underplate 0.04" (1.016mm) Gold plate 0.53 oz (15g) Designed to meet FCC part 15, class B, EN55022 (may need filter) UL 94V-0 Designed to meet IEC/EN/UL/cUL 60950-1, CSA-C22.2 No. 60950-1
TOP VIEW 1.92 (48.8)
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 Components are shown for reference only.
PIN #1
.92 (23.4)
SIDE VIEW .35 (8.9) .25 (6.4)
MOUNTING PLANE .040 .002 PIN WITH .071 .002 SHOULDER 6X AT PINS 1-6 #3
#6
#5 .400 (10.16) C L .400 (10.16)
BOTTOM VIEW 1.800 (45.72) C L .900 REF (22.86)
#2 .300 (7.62) .100 (2.54) .300 (7.62)
C L #4 END VIEW
#1
UEI30 Open Frame 30W Package C80
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MDC_UEI Series 30W.A01 Page 3 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
INPUT CHARACTERISTICS Remote On/Off Control Input Current Under- Reflected Recom- Internal Reverse Start-up voltage (back) mended Input Polarity On/Off Ripple Inrush Output Low Standby Fuse threshold ShutFilter Short Negative Logic 2 TranProtection Current Positive Logic down Current Line Mode Type sient Circuit V V mA pk-pk A2sec mA A mA A mA "P" model suffix "N" model suffix 17.3 17.0 16.0 16.2 30 0.05 50 1.99 1.89 6 6 OFF=Gnd pin or -0.7 to +1.2V max. ON=open pin or +10 to +15V max. OFF=open pin or +10 to +15V max. ON=Gnd pin or -0.7 to +1.2V max.
Model Family
UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C
1
L-C
N/A
1
OUTPUT CHARACTERISTICS IOUT Max. A UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C 9 6 1 Capacitive Loading Max. Adjustment Temperature Range Coefficient Low ESR <0.02 Max, resistive load % of VNOM % of VOUT /C F Ripple/Noise (20 MHz bandwidth)8 Line/Load Regulation OV protection method Minimum loading Efficiency VOUT Accuracy 50% Load % of VNOM Overvoltage protection Hiccup auto-start after fault removal V 5.0 7.3 Magnetic See ordering guide feedback
Model Family
10
0.02
2,000
No
ABSOLUTE MAXIMUM RATINGS Volts, max. continuous Q12 models Volts, transient, 100 mSec Input Voltage Volts, max. continuous Q48 models Volts, transient, 100 mSec On/Off control, referred to -Vin Input Reverse Polarity Protection Output Overvoltage
0-36 VDC to rated specifications 50 VDC, no damage 0-75 VDC to rated specifications 100 VDC, no damage -0.7 V. min to +15V max. See fuse section VOUT nom. +20% max. Current-limited. Devices can withstand sustained short circuit without damage. The outputs are not intended to accept appreciable reverse current. Device includes electronic overtemperature shutdown protection under normal operation. -55 to +125 C. See soldering specifications
Absolute Maximum Ratings Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied nor recommended. Maximum Ratings Notes The UEI-30W series does not include electronic Input Overvoltage Protection. Therefore it is possible for the input to exceed the continuous ratings listed above and still operate. However, units are not routinely Production-tested above the continuous ratings. Therefore, the rated specifications do not apply at excessive input voltage and performance is undetermined. At some combinations of high ambient temperature, low airflow or high output current, the controller may shut down from overtemperature if the maximum rated input voltage is exceeded. The transient specifications indicate that sample lots were successfully tested for 100 mS at the transient stress voltage and were not damaged. As a practical matter in your application, it is often difficult to determine how long an input overvoltage was applied. Therefore, do not exceed the continuous voltage rating.
Output Current
Overtemperature Protection Storage Temperature Lead Temperature
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MDC_UEI Series 30W.A01 Page 4 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
ISOLATION CHARACTERISTICS Input to Output. Model Family Min VDC UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C 2000 2250 2000 2250 2000 2250 2000 2250 Min M 10 10 10 10 10 10 10 10 1000 Basic 65 Basic Isolation Resistance Isolation Capacitance Insulation Safety Rating pF UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C 100 to 1% 200 to 1% VOUT 400 to 1% VOUT 100 to 1% VOUT TBD 250 275 TBD 50 50 DYNAMIC CHARACTERISTICS Start-up Time Dynamic Load Response VIN to VOUT Remote On/Off Switching Frequency (50-75-50% regulated to VOUT load step) (Max.) regulated (Max.) sec 100 to 2% VOUT 180 to 2% mSec 50 50 mSec 50 50 KHz 275 280 275 275
Model Family
MISCELLANEOUS CHARACTERISTICS Output Current Limit Inception Model Family Output Short Circuit 98% of VOUT, after warmup Protection Method A 11.2 7.0 Current limiting, hiccup auto restart Output Short Circuit Current A TBD 0.3 max. Monotonic (external 2,000,000 VOUT < VSET) -40 to +85C; with Derating (see Notes) To +85C/ 85% RH Calculated Output Short Output MTBF Circuit Duration Pre-biased (Note 4) (output shorted setup to ground) Hours Relative Storage Thermal Humidity, Operating Temperature temperature protection/ nonrange shutdown Range condensing C C C
UEI30-033-Q12P-C UEI30-033-Q48N-C UEI30-050-Q12P-C UEI30-050-Q48N-C UEI30-120-Q12P-C UEI30-120-Q48N-C UEI30-150-Q12P-C UEI30-150-Q48N-C 5.3 5.8 TBD
as much output filtering as needed to achieve your noise requirements. Excessive output capacitance can retard transient response or possibly cause instability. Low ESR ceramic capacitors may degrade dynamic performance. Be sure to thoroughly test your system under full load with all components installed. (9) All models are fully operational and meet published specifications, including "cold start" at -40C. At full power, the package temperature of all on-board components must not exceed +128C. (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) The output overvoltage protection is automatic recovery. The overvoltage may occur either from internal failure or from an external forcing voltage as in a shared power system. (12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover. After an output overcurrent or short circuit, "hiccup" operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately resumes normal operation. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (15) If reverse polarity is accidentally applied to the input, to ensure reverse input protection with full output load, always connect an external input fuse in series with the +Vin input. Use approximately twice the full input current rating with nominal input voltage. CAUTION: This product is not internally fused. To comply with safety agency certifications and to avoid injury to personnel or equipment, the user must connect an external fast-blow fuse to the input terminals. See fuse information.
Continuous
-55 to 125C
115
Specification Notes: (1) All models are tested and specified with external 1 F and 10 F parallel output capacitors and a 22 F external input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test equipment and may not be required to achieve specified performance in your applications. All models are stable and regulate within spec under no-load conditions. All specifications are typical unless noted. General conditions for Specifications are +25 deg.C, Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied for extended testing under power. (2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=33 F, 100V, Cbus=220 F, 100V, Lbus=12 H. (3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard=+25 deg.C, full load, natural air convection. (5) The On/Off Control is normally selected by a switch or an open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to Input Common and do not exceed the On/Off voltage specifications. (6) Output current limiting begins when the output voltage degrades approximately 2% from the selected setting. (7) The outputs are not intended to sink appreciable reverse current. (8) Output noise may be further reduced by adding an external filter. Low voltage logic circuits may have a small voltage margin between logic ZERO and logic ONE, requiring noise suppression. Use only
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MDC_UEI Series 30W.A01 Page 5 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
APPLICATION NOTES
Input Fusing Certain applications and/or safety agencies may require fuses at the inputs of power conversion components. Fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. We recommend a time delay fuse installed in the ungrounded input supply line with a value which is approximately twice the maximum line current, calculated at the lowest input voltage. The installer must observe all relevant safety standards and regulations. For safety agency approvals, install the converter in compliance with the end-user safety standard, i.e. IEC/EN/UL 60950-1. Input Reverse-Polarity Protection If the input voltage polarity is reversed, an internal diode will become forward biased and likely draw excessive current from the power source. If this source is not current-limited or the circuit appropriately fused, it could cause permanent damage to the converter. Input Under-Voltage Shutdown and Start-Up Threshold Under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifications). Once operating, converters will not turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off operation at a single input voltage. Users should be aware however of input sources near the Under-Voltage Shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. Such situations could oscillate. To prevent this, make sure the operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. Start-Up Time Assuming that the output current is set at the rated maximum, the Vin to Vout StartUp Time (see Specifications) is the time interval between the point when the ramping input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified accuracy band. Actual measured
times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. These converters include a soft start circuit to moderate the duty cycle of its PWM controller at power up, thereby limiting the input inrush current. The On/Off Remote Control interval from On command to VOUT regulated assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specified accuracy band. The specification assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to VOUT regulated specification such as external load capacitance and soft start circuitry. Input Source Impedance These converters will operate to specifications without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite impedance, performance is improved by adding external filter components. Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to totally characterize all applications, some experimentation may be needed. Note that external input capacitors must accept high speed switching currents. Because of the switching nature of DC/DC converters, the input of these converters must be driven from a source with both low AC impedance and adequate DC input regulation. Performance will degrade with increasing input inductance. Excessive input inductance may inhibit operation. The DC input regulation specifies that the input voltage, once operating, must never degrade below the Shut-Down Threshold under all load conditions. Be sure to use adequate trace sizes and mount components close to the converter. I/O Filtering, Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors (CIN in the figure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient IR drops in the input conductors. Users should select input capacitors for bulk capacitance (at appropriate frequencies), low ESR and high RMS ripple current ratings. In the figure below,
TO OSCILLOSCOPE
CURRENT PROBE LBUS CBUS CIN
1
+INPUT
VIN
+ - + -
2 CIN = 33F, ESR < 700m @ 100kHz CBUS = 220F, ESR < 100m @ 100kHz LBUS = 12H
-INPUT
Figure 2. Measuring Input Ripple Current
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MDC_UEI Series 30W.A01 Page 6 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
the CBUS and LBUS components simulate a typical DC voltage bus. Your specific system configuration may require additional considerations. Please note that the values of CIN, LBUS and CBUS will vary according to the specific converter model. In critical applications, output ripple and noise (also referred to as periodic and random deviations or PARD) may be reduced by adding filter elements such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR. In the figure, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. In order to minimize circuit errors and standardize tests between units, scope measurements should be made using BNC connectors or the probe ground should not exceed one half inch and soldered directly to the fixture. located adjacent to the switching controller, approximately in the center of the unit. See the Performance and Functional Specifications. CAUTION: If you operate too close to the thermal limits, the converter may shut down suddenly without warning. Be sure to thoroughly test your application to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in the next section illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced airflow measured in Linear Feet per Minute ("LFM"). Note that these are AVERAGE measurements. The converter will accept brief increases in temperature and/or current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that very low flow rates (below about 25 LFM) are similar to "natural convection," that is, not using fan-forced airflow.
C2 SCOPE RLOAD
COPPER STRIP +OUTPUT
C1
-OUTPUT COPPER STRIP
C1 = 0.1F CERAMIC C2 = 10F LOW ES LOAD 2-3 INCHES (51-76mm) FROM MODULE
MPS makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. As a practical matter, it is quite difficult to insert an anemometer to precisely measure airflow in most applications. Sometimes it is possible to estimate the effective airflow if you thoroughly understand the enclosure geometry, entry/exit orifice areas and the fan flowrate specifications. If in doubt, contact MPS to discuss placement and measurement techniques of suggested temperature sensors. CAUTION: If you routinely or accidentally exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these graphs are all collected at slightly above Sea Level altitude. Be sure to reduce the derating for higher density altitude. Output Overvoltage Protection This converter monitors its output voltage for an over-voltage condition using an on-board electronic comparator. The signal is optically coupled to the primary side PWM controller. If the output exceeds OVP limits, the sensing circuit will power down the unit, and the output voltage will decrease. After a time-out period, the PWM will automatically attempt to restart, causing the output voltage to ramp up to its rated value. It is not necessary to power down and reset the converter for the this automatic OVP-recovery restart. If the fault condition persists and the output voltage climbs to excessive levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling is referred to as "hiccup" mode. It safely tests full current rated output voltage without damaging the converter. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protection. In the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. Consider using an appropriate fuse in series with the output. Output Current Limiting As soon as the output current increases to approximately 125% to 150% of its maximum rated value, the DC/DC converter will enter a current-limiting mode. The output voltage will decrease proportionally with increases in output
Figure 3 - Measuring Output Ripple and Noise (PARD)
Floating Outputs Since these are isolated DC/DC converters, their outputs are "floating" with respect to their input. The essential feature of such isolation is ideal ZERO CURRENT FLOW between input and output. Real-world converters however do exhibit tiny leakage currents between input and output (see Specifications). These leakages consist of both an AC stray capacitance coupling component and a DC leakage resistance. When using the isolation feature, do not allow the isolation voltage to exceed specifications. Otherwise the converter may be damaged. Designers will normally use the negative output (-Output) as the ground return of the load circuit. You can however use the positive output (+Output) as the ground return to effectively reverse the output polarity. Minimum Output Loading Requirements These converters employ a synchronous rectifier design topology. All models regulate within specification and are stable under no load to full load conditions. Operation under no load might however slightly increase output ripple and noise. Thermal Shutdown To prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. If environmental conditions cause the temperature of the DC/DC's to rise above the Operating Temperature Range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. When the temperature decreases below the turn-on threshold, the converter will automatically restart. There is a small amount of hysteresis to prevent rapid on/off cycling. The temperature sensor is typically
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MDC_UEI Series 30W.A01 Page 7 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
current, thereby maintaining a somewhat constant power output. This is commonly referred to as power limiting. Current limiting inception is defined as the point at which full power falls below the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly rise above its rated value. This enhances reliability and continued operation of your application. If the output current is too high, the converter will enter the short circuit condition. Output Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the output current demand increases. If the output voltage drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the PWM controller. Following a time-out period, the PWM will restart, causing the output voltage to begin ramping up to its appropriate value. If the short-circuit condition persists, another shutdown cycle will initiate. This on/off cycling is called "hiccup mode". The hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures. A short circuit can be tolerated indefinitely. Trimming the Output Voltage The Trim input to the converter allows the user to adjust the output voltage over the rated trim range (please refer to the Specifications). In the trim equations and circuit diagrams that follow, trim adjustments use either a trimpot or a single fixed resistor connected between the Trim input and either the +Sense or -Sense terminals. (On some converters, an external user-supplied precision DC voltage may also be used for trimming). Trimming resistors should have a low temperature coefficient (100 ppm/deg.C or less) and be mounted close to the converter. Keep leads short. If the trim function is not used, leave the trim unconnected. With no trim, the converter will exhibit its specified output voltage accuracy. There are two CAUTIONs to be aware for the Trim input: CAUTION: To avoid unplanned power down cycles, do not exceed EITHER the maximum output voltage OR the maximum output power when setting the trim. Be particularly careful with a trimpot. If the output voltage is excessive, the OVP circuit may inadvertantly shut down the converter. If the maximum power is exceeded, the converter may enter current limiting. If the power is exceeded for an extended period, the converter may overheat and encounter overtemperature shut down. CAUTION: Be careful of external electrical noise. The Trim input is a senstive input to the converter's feedback control loop. Excessive electrical noise may cause instability or oscillation. Keep external connections short to the Trim input. Use shielding if needed.
-INPUT
+OUTPUT
ON/OFF CONTROL
TRIM RTRIM DOWN
LOAD
+INPUT
-OUTPUT
Figure 5 - Trim adjustments to decrease Output Voltage using a Fixed Resistor
Trim Equations
Trim Up Trim Down
UEI30-033-Q12/-Q48
RT UP (:) = 12775 VO - 3.3 - 2050 RTDOWN (:) = 5110 (Vo - 2.5) 3.3 - VO - 2050
UEI30-050-Q12/-Q48
RT UP (:) = 12775 VO - 5 - 2050 RTDOWN (:) = 5110 (Vo - 2.5) - 2050 5 - VO
UEI30-120-Q12/-Q48
RT UP (:) = 25000 VO - 12 - 5110 RTDOWN (:) = 10000 (Vo-2.5) -5110 12 - VO
-INPUT
+OUTPUT
RT UP (:) = 25000 VO - 15
UEI30-150-Q12/-Q48
- 5110 RTDOWN (:) = 10000 (Vo-2.5) -5110 15 - VO
ON/OFF CONTROL
TRIM
7 5-22 TURNS
LOAD
Where Vo = Desired output voltage. Adjustment accuracy is subject to resistor tolerances and factory-adjusted output accuracy. Mount trim resistor close to converter. Use short leads. Remote On/Off Control On the input side, a remote On/Off Control can be ordered with either polarity. Positive: Standard models are enabled when the On/Off pin is left open or is pulled high to +VIN with respect to -VIN. An internal bias current causes the open pin to rise to +VIN. Some models will also turn on at lower intermediate voltages (see Specifications). Positive-polarity devices are disabled when the
+INPUT
-OUTPUT
Figure 4 - Trim adjustments using a trimpot
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MDC_UEI Series 30W.A01 Page 8 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
On/Off is grounded or brought to within a low voltage (see Specifications) with respect to -VIN. Negative: Optional negative-polarity devices are on (enabled) when the On/ Off is grounded or brought to within a low voltage (see Specifications) with respect to -VIN. The device is off (disabled) when the On/Off is left open or is pulled high to +15VDC Max. with respect to -VIN. Dynamic control of the On/Off function should be able to sink appropriate signal current when brought low and withstand appropriate voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) between the time of On/Off Control activation and stable, regulated output. This time will vary slightly with output load type and current and input conditions. There are two CAUTIONs for the On/Off Control: CAUTION: While it is possible to control the On/Off with external logic if you carefully observe the voltage levels, the preferred circuit is either an open drain/open collector transistor or a relay (which can thereupon be controlled by logic). The On/Off prefers to be set at approx. +15V (open pin) for the ON state, assuming positive logic. CAUTION: Do not apply voltages to the On/Off pin when there is no input power voltage. Otherwise the converter may be permanently damaged.
3 ON/OFF CONTROL
-INPUT
+OUTPUT
ON/OFF CONTROL
TRIM R TRIM UP
LOAD
+INPUT
-OUTPUT
Figure 6 - Trim adjustments to increase Output Voltage using a Fixed Resistor
+VCC
1
-INPUT
Figure 7 - Driving the On/Off Control Pin (suggested circuit)
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Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UEI Series 30W.A01 Page 9 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
PERFORMANCE DATA
Efficiency vs. Line Voltage and Load Current @ 25C
UEI30-033-Q48
Maximum Current Temperature Derating @Sea Level (VIN = 24V, airflow is from input to output)
100 90
9.1
9
Output Current (Amps)
80
8.9
Natural convection 100 LFM 200 LFM
Efficiency (%)
70 60 50
Vin = 75 V Vin = 48 V Vin = 24 V Vin = 18 V
8.8
8.7
8.6
40 30 20 0 1 2 3 4 5 6 7 8 9
8.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Ambient Temperature (C)
Load Current (Amps)
UEI30-033-Q48
Maximum Current Temperature Derating @Sea Level (VIN = 48V, airflow is from input to output)
9.1
9
Output Current (Amps)
8.9
Natural convection 100 LFM 200 LFM
8.8
8.7
8.6
8.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Ambient Temperature (C)
Efficiency vs. Line Voltage and Load Current @ 25C
UEI30-050-Q12
Maximum Current Temperature Derating @Sea Level (VIN = 36V, longitudinal airflow)
100
6.1 6.0
90
80
Output Current (Amps)
5.9 5.8 5.7 5.6 5.5
20 25 30 35 40 45 50
Efficiency (%)
70
Vin = 75 V Vin = 48 V Vin = 24 V Vin = 18 V
Natural convection 100 LFM 200 LFM 300 LFM
60
50
40
55
60
65
70
75
80
85
90
30
Ambient Temperature (C)
20
0
5. 00
4. 00
Load Current (Amps)
3. 00
1. 00
2. 00
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6. 00
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_UEI Series 30W.A01 Page 10 of 11
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
PERFORMANCE DATA UEI30-050-Q48
Efficiency vs. Line Voltage and Load Current @ 25C
100 90
6.1
Maximum Current Temperature Derating @Sea Level (VIN = 18V, transverse airflow)
80
6.0 Output Current (Amps)
Efficiency (%)
70 60 50 40 30 20
Vin = 75 V Vin = 48 V Vin = 24 V Vin = 18 V
5.9 5.8 5.7 5.6 5.5 20
Natural convection 100 LFM 200 LFM 300 LFM
25
30
35
40
45
50 55 60 65 Ambient Temperature (C)
70
75
80
85
90
3.0 0
2.0 0
1.0 0
Load Current (Amps)
4.0 0
5.0 0
Maximum Current Temperature Derating @Sea Level (VIN = 24V, transverse airflow)
UEI30-050-Q48
6.0 0
0
Maximum Current Temperature Derating @Sea Level (VIN = 48V, transverse airflow)
6.1 Output Current (Amps) 6.0 5.9 5.8 5.7 5.6 5.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Output Current (Amps)
6.1 6.0 5.9 5.8 5.7 5.6 5.5 20 25 30 35 40 45 50 55 60 65 Ambient Temperature (C) 70 75 80 85 90 Natural convection 100 LFM
Natural convection
Ambient Temperature (C)
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
02/20/09
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2008 Murata Power Solutions, Inc.
www.murata-ps.com
MDC_UEI Series 30W.A01 Page 11 of 11

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