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Technical S pecification
BQ60120HEA30
35-75V
Input
12V
Output
360Watt
Power
2250Vdc
Isolation
Half-brick
DC/DC Conver ter
The BQ60120HEA30 BusQor TM Exa series converter is a next-generation, board-mountable, isolated, wide input, reg ulated, fixed switching frequency DC/DC converter that uses synchronous rectification to achieve extremely high conver sion efficiency. The BusQor Exa series provides an isolated step down voltage from 35-75V to 12V with tight output volt age regulation in a standard "half-brick" module and is avail able in open-frame and baseplated version. BusQor con verters are ideal for customers who need multiple outputs and wish to use point of load converters to work with a 12V rail. T h e B u s Q o r E x a s e r i e s c o n v e rt e r s o f f e r i n d u s t r y - l e a d i n g u s e able output current for powering intermediate bus architech ture systems. RoHS 5/6 compliant (see page 12 ).
Operational Features
* Ultra-high efficiency, 95% at full rated load current * Delivers up to 360 Watts of output power, subject to derating over temperature and airflow * Wide input voltage range: 35V - 75V, with 100V 100ms input voltage transient withstand capability * Fixed frequency switching provides predictable EMI performance
Bus Conver ter
BQ60120HEA30 Module
Pr otection Features
* * * * * Input under-voltage lockout Output current limit and short circuit protection Output over-voltage protection Thermal shutdown Backdrive protection prevents excessive negative current flow
Mechanical Features
* Industry standard half-brick pin-out configuration * Industry standard size: 2.3" x 2.4" (58.4 x 61mm) * Total height 0.45" (11.5mm), permits better airflow and smaller card pitch (0.54" baseplated module) * Total weight: 2.6 oz. (75 grams) for open-frame
Contr ol Features
* On/Off control referenced to input side (positive and negative logic options are available) * Remote sense for the output voltage compensates for output distribution drops * Output voltage trim down to 6.0V permits custom voltages and voltage margining (+5%/-50%) * Short startup inhibit time
Safety Features
* 2250V, 30 M input-to-output isolation * UL/cUL 60950-1 recognized (US & Canada), basic insulation rating * TUV certified to EN60950-1 * Meets 72/23/EEC and 93/68/EEC directives * Meets UL94V-0 flammability requirements
Product # BQ60120HEA30 Phone 1-888-567-9596 www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 1
Technical Specification
MECHANICAL DIAGRAM
Open-Frame Version
1.400
(35.56)
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
1.90
(48.2)
1.000
(25.40)
1.55
(39.3)
0.31
(8.0)
0.700
(17.78)
0.85
(21.5)
0.400
(10.16)
0.50
(12.6)
0.11
(2.9)
2.30
(58.4)
1.90
(48.3)
Top View
Bottom View
Each exposed copper staple connected to adjacent pin 5 and 9. See Note 7
0.400 0.19
(4.8)
0.50
(12.7)
(10.16)
0.422 + 0.030
(10.72 + 0.76)
1.400
(35.56)
2.40
(61.0)
Side View
NOTES
1) Pins 1, 2, 4, 6-8 are 0.040" (1.02mm) diameter with 0.080" (2.03mm) diameter standoff shoulders. 2) Pins 5 and 9 are 0.080" (2.03 mm) diameter shoulderless pins. 3) Other pin extension lengths available. Recommended pin length is 0.03" (0.76mm) greater than the PCB thickness. 4) All Pins: Material - Copper Alloy Finish - Tin/Lead over Nickel plate 5) Undimensioned components are shown for visual reference only. 6) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 7) Same net copper planes recommended on customer board in designated areas adjacent to pins 5 and 9, as worst case bottom side clearance could cause exposed copper staple to touch customer board surface. 8) Weight: 2.6 oz. (75g) typical 9) Workmanship: Meets or exceeds IPC-A-610C Class II 10) UL/TUV standards require a clearance greater than 0.04" (1.02mm) between input and output for Basic insulation. This issue should be considered if any copper traces are on the top side of the user's board. Note that the ferrite cores are considered part of the input/primary circuit.
Product # BQ60120HEA30 Phone 1-888-567-9596
0.145
(3.68) See Note 3
Customer Board
Lowest Component
0.010+/-0.009
(0.25+/-0.22)
Bottom side Clearance
See Note 10
PIN DESIGNATIONS
Pin No. Name
1 2 4 5 6 7 8 9 Vin(+) ON/OFF Vin(-) Vout(-) SENSE(-) TRIM SENSE(+) Vout(+)
Function
Positive input voltage TTL input to turn converter on and off, referenced to Vin(-), with internal pull up. Negative input voltage Negative output voltage Return remote sense Output voltage trim Positive remote sense Positive output voltage
09/02/05 Page 2
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Doc.# 005-2BH612M Rev. B
Technical Specification
MECHANICAL DIAGRAM
Baseplated Version
2.40
(61.0)
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
1.400
(35.56)
Bottom View
M3 Threaded Insert 4 Places See Note 1 & 2
1.000
(25.40)
0.700 (17.78) 0.400
(10.16)
Bottom view is identical to openframe version shown on Page 2.
0.300
(7.62)
Side View
2.30
(58.4)
0.506 + 0.030
(12.85 + 0.76)
0.20
(5.1)
Top View
1.90
(48.3)
1.90
(48.3)
0.19
(4.8)
Customer Board
Lowest Component
0.010 +.009
(.25 +.22) Bottom side Clearance
0.145
(3.68) See Note 6
0.50
(12.7)
0.400
(10.16)
0.20
(5.1)
Pin farside typical
1.400
(35.56)
2.000
(50.80)
NOTES
1) M3 screws used to bolt unit's baseplate to other surfaces (such as heatsink) must not exceed 0.100" (2.54 mm) depth below the surface of the baseplate. 2) Applied torque per screw should not exceed 6in-lb. (0.7 Nm) 3) Baseplate flatness tolerance is 0.004" (.10mm) TIR for surface 4) Pins 1, 2, 4, 6-8, are 0.040" (1.02mm) diameter with 0.080" (2.03mm) diameter standoff shoulders 5) Pins 5, 9 are 0.080" (2.03mm) diameter shoulderless pins. 6) Other pin extension lengths available 7) All Pins: Material - Copper Alloy Finish - Tin/Lead over Nickel plate 8) Undimensioned components are shown for visual reference only. 9) Weight: 4.3 oz. (123 g) typical 10) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) 11) Workmanship: Meets or exceeds IPC-A-610C Class II
Product # BQ60120HEA30 Phone 1-888-567-9596 www.synqor.com
PIN DESIGNATIONS
Pin connections are identical to open-frame version shown on Page 2. Use "B" as 10th letter in part number for baseplated version (see ordering page).
Doc.# 005-2BH612M Rev. B
09/02/05
Page 3
Technical Specification
BQ60120HEA30 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
TA=25C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40C to +100C ambient temperature with appropriate power derating. Specifications subject to change without notice.
Min. Typ. Max.
100 80 100 2250 100 125 48 33.5 30.5 3.0 140 30 20 130 0\1.0\5.0 100\90 100 0.2 12.00 75 34.4 32.4 11.6 180 50 40 20
Units
V V V V C C V V V V A mA mA mA mA A F\H\F nH\F F
Notes & Conditions
Continuous Continuous 100ms transient, square wave Basic insulation level, Pollution degree 2 See Figures 7 - 10 for derating
Input Voltage Non-Operating Operating Operating Transient Protection Isolation Voltage (input to output) Operating Temperature Storage Temperature Operating Input Voltage Range Input Under-Voltage Lockout Turn-On Voltage Threshold Turn-Off Voltage Threshold Lockout Voltage Hysteresis Maximum Input Current No-Load Input Current Disabled Input Current Input Reflected Ripple Current Input Terminal Ripple Current Recommended Input Fuse Input Filter Component Values (C1\L\C2) Output Filter Component Values (Lout\Cout) Recommended External Input Capacitance Recommended External Input Capacitor ESR1
-40 -55 35 31.5 29.5
INPUT CHARACTERISTICS
100% Load, 35 Vin, trimmed up 5% RMS thru inductor; Figures 15 & 17 RMS; Figures 15 & 16 Fast blow external fuse recommended Internal values; see Figure D Internal values; see Figure D Typical ESR 0.2; see Figure 15
100kHz, -40C to 100C
100 0.04 11.88
1.5 12.12
V
OUTPUT CHARACTERISTICS
Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Current Range Output DC Current-Limit Inception Back-Drive Current Limit while Enabled Back-Drive Current Limit while Disabled Maximum Output Capacitance Start-up Output Voltage Overshoot (with max. cap.) Recommended External Output Capacitance Input Voltage Ripple Rejection Output Voltage during Load Current Transient For a Step Change in Output Current (0.1A/s) For a Step Change in Output Current (5A/s) Settling Time Turn-On Transient Turn-On Time Start-Up Inhibit Period 100% Load 50% Load Semiconductor Junction Temperature Board Temperature Transformer Temperature Maximum Baseplate Temperature Limit Isolation Voltage (dielectric strength) Isolation Resistance Isolation Capacitance
11.75
+0.05 \ 6 +0.1 \ 12 +0.1 \ 12 +0.2 \ 24 +45 +90 12.33 60 20 37 1.8 0.3 0 80 300 500 100 120 40 30 40 3.2 0.6 >10,000
%\mV %\mV mV V mV mV A A A A F % F dB mV mV s
0 34 0.8
44
Over sample, line, load, temperature & life 44F local ceramic, Figures 15 & 18 Full Load; Figures 15 & 18 Full Load; Figures 15 & 18 Subject to thermal derating; Figures 7 - 10 Output Voltage 10% Low; Figure 19 Negative current drawn from output Negative current drawn from output 12Vout at 30A resistive load 10,000F, Iout=30A resistive load Local ceramic 120 Hz; Figure 22 50% to 75% to 50% Iout max; Figure 13 50% to 75% to 50% Iout max; Figure 14 To within 1% Vout nom Full load, Vout=90% nom.; Figures 11 & 12 Figures 1 - 6 Figures 1 - 6 Package rated to 150C UL rated max operating temp 130C See Figures 7 - 10 for derating curves Applies to BQ60120HEB30 only
DYNAMIC CHARACTERISTICS
8 2
14 3 95 95
20 4
ms ms % %
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
125 125 125 100 2250 30 1000
C C C C V M pF
ISOLATION CHARACTERISTICS
1. Electrolytic capacitor ESR tends to increase dramatically at low temperature.
Product # BQ60120HEA30
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Doc.# 005-2BH612M Rev. B
09/02/05
Page 4
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
Min.
270 135 -2 3.5 2.7 -2 4.5 -50 113
Typ.
300 150
Max.
330 165 0.8 18 18 0.8
Units
kHz kHz V V V V V k % % C C
6
Notes & Conditions
Synchronous to regulation stage
Switching Frequency Regulation Stage Switching Frequency Isolation Stage ON/OFF Control (Option P) Off-State Voltage On-State Voltage ON/OFF Control (Option N) Off-State Voltage On-State Voltage ON/OFF Control (Either Option) Pull-Up Voltage Pull-Up Resistance Output Voltage Trim Range Output Over-Voltage Protection Over-Temperature Shutdown Over-Temperature Shutdown Restart Hysteresis Load Current Scale Factor Calculated MTBF (Telcordia) Calculated MTBF (MIL-217) Field Demonstrated MTBF
5 10 118 120 10 600 1.9 1.4
6 +5 123
Figure A Measured across Pins 9 & 5; Figure B Over full temp range; % of nominal Vout Average PCB Temperature See App Note: Output Load Current Calc.
RELIABILITY CHARACTERISTICS
10 Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta 106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta 106 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter P
STANDARDS COMPLIANCE
Notes
File # E194341, Basic insulation & pollution degree 2 Certified by TUV Test on entire assembly; board & plastic components UL94V-0 compliant ESD test, 8kV - NP, 15kV air - NP (Normal Performance) Section 7 - electrical safety, Section 9 - bonding/grounding
UL/cUL 60950-1 EN60950-1 72/23/EEC 93/68/EEC Needle Flame Test (IEC 695-2-2) IEC 61000-4-2 GR-1089-CORE Telcordia (Bellcore) GR-513
* An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
# Units
32 5 5 10 5 5 5 15 pins
Test Conditions
10-55Hz sweep, 0.060" total excursion,1 min./sweep, 120 sweeps for 3 axis
Life Test Vibration Mechanical Shock Temperature Cycling Power/Thermal Cycling Design Marginality Humidity Solderability
95% rated Vin and load, units at derating point, 1000 hours
100g minimum, 2 drops in x and y axis, 1 drop in z axis -40C to 100C, unit temp. ramp 15C/min., 500 cycles Toperating = min to max, Vin = min to max, full load, 100 cycles Tmin-10C to Tmax+10C, 5C steps, Vin = min to max, 0-105% load 85C, 85% RH, 1000 hours, 2 minutes on and 6 hours off MIL-STD-883, method 2003
* Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply robust, reliable product. Contact factory for official product family qualification document.
OPTIONS
SynQor provides various options for Logic Sense, Pin Length and Feature Set for this family of DC/DC converters. Please consult the last page of this specification sheet for information on available options.
Product # BQ60120HEA30 Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents, including but not limited to U.S. Patent # 5,999,417; 6,222,742 B1; 6,594,159 B2; 6,545,890 B2.
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Doc.# 005-2BH612M Rev. B
09/02/05
Page 5
Technical Specification
100 22 20 95 18
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
90
Power Dissipation (W)
16 14 12 10 8 6 35 Vin 4 2 0 48 Vin 75 Vin
Efficiency (%)
85
80 35 Vin 75 48 Vin 75 Vin 70 0 3 6 9 12 15 18 21 24 27 30
0
3
6
9
12
15
18
21
24
27
30
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal 12V output vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 2: Power dissipation at nominal 12V output vs. load current for minimum, nominal, and maximum input voltage at 25C.
100
22 20
95
18
Efficiency (%)
90
Power Dissipation (W)
16 14 12 10 8 6 35 Vin 4 2 0 48 Vin 75 Vin
85
80 35 Vin 75 48 Vin 75 Vin 70 0 3 6 9 12 15 18 21 24 27 30
0
3
6
9
12
15
18
21
24
27
30
Load Current (A)
Load Current (A)
Figure 3: Efficiency at trimmed-down 9.0V output vs. load current for minimum, nominal, and maximum input voltage at 25C.
Figure 4: Power dissipation at trimmed-down 9.0V output vs. load current for minimum, nominal, and maximum input voltage at 25C.
100
22 20
95
18
Efficiency (%)
90
Power Dissipation (W)
16 14 12 10 8 6 4 2 0 35 Vin 48 Vin 75 Vin
85
80 35 Vin 75 48 Vin 75 Vin 70 0 3 6 9 12 15 18 21 24 27 30
0
3
6
9
12
15
18
21
24
27
30
Load Current (A)
Load Current (A)
Figure 5: Efficiency at trimmed-down 6.0V output vs. load current for minimum, nominal, and maximum input voltage at 25C.
Product # BQ60120HEA30 Phone 1-888-567-9596
Figure 6: Power dissipation at trimmed-down 6.0V output vs. load current for minimum, nominal, and maximum input voltage at 25C.
Doc.# 005-2BH612M Rev. B 09/02/05 Page 6
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Technical Specification
30
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
20
15
10
400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
5
0 0 25 40 55 70 85
Ambient Air Temperature (C)
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from input to output (nominal input voltage).
30
Figure 8: Thermal plot of converter at 25 amp load current (300W) with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from input to output (nominal input voltage).
20
15
10
400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s)
5
0 0 25 40 55 70 85
Ambient Air Temperature (C)
Figure 9: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from pin 1 to pin 4 (nominal input voltage).
Figure 10: Thermal plot of converter at 24.5 amp load current (294W) with 55C air flowing at the rate of 200 LFM. Air is flowing across the converter from pin 1 to pin 4 (nominal input voltage).
Figure 11: Turn-on transient at full load (resistive load) (10 ms/div). Input voltage pre-applied. Top Trace: Vout (5V/div). Bottom Trace: ON/OFF input (5V/div)
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Figure 12: Turn-on transient at zero load (10 ms/div). Top Trace: Vout (5V/div). Bottom Trace: ON/OFF input (5V/div).
Doc.# 005-2BH612M Rev. B 09/02/05 Page 7
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Semiconductor junction temperature is within 1C of surface temperature
25
Iout (A)
Semiconductor junction temperature is within 1C of surface temperature
25
Iout (A)
Technical Specification
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
Figure 13: Output voltage response to step-change in load current (50%75%-50% of Iout(max); dI/dt = 0.1A/s). Load cap: 47F ceramic cap. Top trace: Vout (500mV/div), Bottom trace: Iout (10A/div).
Figure 14: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 5A/s). Load cap: 470F, 15 m ESR tantalum cap and 47F ceramic cap. Top trace: Vout (500mV/div), Bottom trace: Iout (10A/div).
See Fig. 17
source impedance
4.7 H
See Fig. 16 See Fig. 18
iS
iC
DC/DC Converter
2x22 F
local ceramic capacitance
VOUT
VSOURCE
100 F, ESR 0.2
electrolytic capacitor
1 F ceramic, 15 F tantalum
Figure 15: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 16), Input Reflected Ripple Current (Figure 17) and Output Voltage Ripple (Figure 18).
Figure 16: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 4.7H source impedance and 100F electrolytic capacitor (100 mA/div). (See Figure 15)
Figure 17: Input reflected ripple current, is, through a 4.7 H source inductor at nominal input voltage and rated load current (10 mA/div). (See Figure 15)
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Figure 18: Output voltage ripple at nominal input voltage and rated load current (20 mV/div). Load capacitance: 2x22F ceramic capacitor. Bandwidth: 500 MHz. (See Figure 15)
Doc.# 005-2BH612M Rev. B 09/02/05 Page 8
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Technical Specification
16
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
OVP Shutdown
14
Output Voltage (V)
12 10 8 6 4 35 - 75 Vin 2 0 -5 0 5 10 15 20 25 30 35 40 45
Load Current (A)
Figure 19: Output voltage vs. load current showing typical current limit curves and OVP shutdown point.
Figure 20: Load current (10A/div) as a function of time when the converter attempts to turn on into a 1 m short circuit.
1
0 -10
Output Impedance ( )
0.1
Forward Transmission (dB)
-20 -30 -40 -50 -60 -70 -80 -90 -100
35 Vin 48 Vin 75 Vin
0.01
35 Vin 48 Vin 75 Vin
0.001
0.0001 100 1,000 10,000 100,000
-110 100 1,000 10,000 100,000
Hz
Hz
Figure 21: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power.
Figure 22: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power.
20 10 0
35 Vin Input Impedance ( )
100
Reverse Transmission (dB)
10
35 Vin
-10 -20 -30 -40 100 1,000 10,000 100,000
48 Vin 75 Vin
1
48 Vin 75 Vin
0.1
0.01 100 1,000 Hz 10,000 100,000
Hz
Figure 23: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power.
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Figure 24: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power.
Doc.# 005-2BH612M Rev. B 09/02/05 Page 9
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Technical Specification
BASIC OPERATION AND FEATURES
The BusQor Exa series converter uses a two-stage power conversion topology. The first stage keeps the output voltage constant over variations in line, load, and temperature. The second stage uses a transformer to provide the functions of input/output isolation and voltage step-down to achieve the low output voltage required. Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance. Rectification of the transformer's output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes. This is the primary reason that the BusQor converter has such high efficiency. Dissipation throughout the converter is so low that it does not require a heatsink for operation. Since a heatsink is not required, the BusQor converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink. The BusQor converter can thus be built more simply and reliably using high yield surface mount techniques on a PCB substrate. The BusQor series of half-brick, quarter-brick and eighth-brick converters uses the industry standard footprint and pin-out configuration.
Input: Output: Current: Package:
CONTROL FEATURES
35-75 V 12 V 30 A Half-brick
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure A details five possible circuits for driving the ON/OFF pin. REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs correct for voltage drops along the conductors that connect the converter's output pins to the load. Pin 8 should be connected to Vout(+) and Pin 6 should be connected to Vout(-) at the point on the board where regulation is desired. If these connections are not made, the converter will deliver an output voltage that is slightly lower than its specified value. Note: the output over-voltage protection circuit senses the voltage across the sense leads (pins 8 and 6) to determine when it should trigger, not the voltage across the converter's output pins (pins 9 and 5). OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. SynQor uses industry standard trim equations.
ON/OFF
ON/OFF
ON/OFF
To decrease the output voltage, the user should connect a resistor between Pin 7 and Pin 6 (SENSE(-) input). For a desired decrease of the nominal output voltage, the value of the resistor should be
Rtrim-down =
Vin(_) Remote Enable Circuit Vin(_) Negative Logic (Permanently Enabled) ON/OFF
TTL/ CMOS
(100%) - 2 k
x 100%
Vin(_) Positive Logic (Permanently Enabled)
where
% =
Vnominal - Vdesired Vnominal
5V ON/OFF
To increase the output voltage, the user should connect a resistor between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase of the nominal output voltage, the value of the resistor should be
Vin(_) Open Collector Enable Circuit
Vin(_) Direct Logic Drive
Rtrim-up =
(Vnominal - 2) x VDES + VNOM 1.225
VDES - VNOM
09/02/05
k
Figure A: Various circuits for driving the ON/OFF pin.
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Technical Specification
Figure B graphs the relationship between the trim resistor value and Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down.
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
constant output current. There is no minimum operating output voltage. The converter will run with low on-board power dissipation down to zero output voltage. A redundant circuit will shutdown the converter if the primary current limit fails. Back-Drive Current Limit: If there is negative output current of a magnitude larger than the "Back-Drive Current Limit while Enabled" specification*, then a fast back-drive limit controller will increase the output voltage to maintain a constant output current. If this results in the output voltage exceeding the "Output OverVoltage Protection" threshold*, then the unit will shut down. The full I-V output characteristic can be seen in Figure 19. Output Over-Voltage Limit: If the voltage across the output pins exceeds the "Output Over-Voltage Protection" threshold*, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. Load capacitance determines exactly how high the output voltage will rise in response to these conditions. Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the OverTemperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value. Start-up Inhibit Period: If any protection feature causes the converter to shut down, the converter will attempt to restart after 2ms (typical), the "Startup Inhibit Period".* On initial application of input voltage, with the on/off pin set to enable the converter, the "Turn-On Time"* will increase by only 2ms.
0 10,000.0
5
10
15
20
25
30
35
40
45
50
1,000.0
Trim Resistance (kOhms)
100.0
10.0
1.0
0.1
0.0
% Increase in Vout
% Decrease in Vout
Figure B: Trim Graph for 12Vout module
Note: the TRIM feature does not affect the voltage at which the output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage protection circuit to engage, particularly during transients. It is not necessary for the user to add capacitance at the Trim pin. The node is internally filtered to eliminate noise. Total DC Variation of Vout: For the converter to meet its full specifications, the maximum variation of the DC value of Vout, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the application note titled "Input System Instability" available on the SynQor website. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical "Turn-On Voltage Threshold" value* before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Current Limit: If the output current exceeds the "Output DC Current Limit Inception" point*, then a fast linear current limit controller will reduce the output voltage to maintain a * See specification page.
Product # BQ60120HEA30 Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 11
Technical Specification
APPLICATION CONSIDERATIONS
Input System Instability: This condition can occur because any DC/DC converter appears incrementally as a negative resistance load. A detailed application note titled "Input System Instability" is available on the SynQor website (www.synqor.com) which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits: Figure C below provides a typical circuit diagram which details the input filtering and voltage trimming. Input Filtering and External Input Capacitance: Figure D below shows the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of an external electrolytic input capacitor. The recommended external input capacitance is specified in the "Input Characteristics" section. More detailed information is available in the application note titled "EMI Characteristics" on the SynQor website. Output Filtering and External Output Capacitance: Figure D below shows the internal output filter components. This filter dramatically reduces output voltage ripple. However, some
Input: Output: Current: Package:
35-75 V 12 V 30 A Half-brick
minimum external output capacitance is required, as specified in the Output Characteristics section on the Electrical Specifications page. No damage will occur without this capacitor connected, but peak output voltage ripple will be much higher. RoHS Compliance: The EU led RoHS (Restriction of Hazardous Substances) Directive bans the use of Lead, Cadmium, Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical and Electronic Equipment. SynQor products are currently 5/6 RoHS compliant with lead being the exception. For more information please visit our RoHS Compliance / Lead Free Initiative web or e-mail us at rohs@synqor.com.
2 x 22F local ceramic Electrolytic Capacitor
Vin(+)
Vout(+) Vsense(+) Rtrim-up
or
Vin
External Input Filter
ESR 0.2
100F
ON/OFF
Trim
Vsense(_) Vin(_) Vout(_)
Rtrim-down
Cload
Iload
Figure C: Typical application circuit (negative logic unit, permanently enabled).
Lin
Vin(+) C1 Vin(_) C2
Regulation Stage Current Sense Isolation Stage
Lout /2
Vout(+) Cout
Lout /2
Vout(_)
Figure D: Internal Input and Output Filter Diagram (component values listed on the specifications page).
Product # BQ60120HEA30 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2BH612M Rev. B 09/02/05 Page 12
Technical Specification
PART NUMBERING SYSTEM
The part numbering system for SynQor's BusQor DC/DC converters follows the format shown in the example below.
BQ 60 120 H E A 30 N N S Options (see Ordering Information) Output Current Thermal Design Performance Level Package Size Output Voltage Input Voltage Product Family
Input: Output: Current: Package:
ORDERING INFORMATION
35-75 V 12 V 30 A Half-brick
The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options.
Model Number BQ60120HEw25xyz BQ60120HEw30xyz Input Voltage 35 - 75 V 35 - 75 V Output Max Output Voltage Current 12 V 25 A 12 V 30 A
The following option choices must be included in place of the x y z spaces in the model numbers listed above.
Options Description: w x y z
Thermal Design Enable Logic Pin Length Feature Set
The first 12 characters comprise the base part number and the last 3 characters indicate available options. Although there are no default values for enable logic, pin length, and feature set, the most common options are negative logic, 0.145" pins and standard feature set. These part numbers are more likely to be readily available in stock for evaluation and prototype quantities.
K - 0.110" A - Open Frame P - Positive N - 0.145" S - Standard B - Baseplated N - Negative R - 0.180" Y - 0.250"
Application Notes
A variety of application notes and technical white papers can be downloaded in pdf format from our website.
Contact SynQor for further information:
Phone: Toll Free: Fax: E-mail: Web: Address:
978-849-0600 888-567-9596 978-849-0602 power@synqor.com www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA
Phone 1-888-567-9596
Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor.
Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor.
Doc.# 005-2BH612M Rev. B 09/02/05 Page 13
Product # BQ60120HEA30
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