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| 100 Watt, Digitally Programmable Low-Voltage, Electronic Loads DTL Series DTL2A-LC Model Features 12-bit, optically isolated (500Vdc), CMOS/TTL-compatible serial input Output load voltages as low as 0.6 Volts Output current 0-20A in 5mA increments Output power to 100 Watts 10M minimum output impedance 10mA offset error; 0.4% gain error 100sec full-scale step response Operate in parallel for higher power Miniature, 2" x 2" metal package Applications Static/dynamic power-supply burn-in Power-supply test and characterization Battery capacity testing Current-source testing Capacitor discharge testing Real-time load simulation DATEL's new DTL2A-LC is an optically isolated, digitally programmable, serialinput electronic load designed for use in burn-in, characterization and test of today's low-voltage power supplies and power components. The DTL2A-LC is essentially a digitally controlled current source that can sink currents from 0 to 20 Amps, at loading voltages as low as 0.6 Volts, up to a maximum power of 100 Watts. The DTL2A-LC accepts a serialized, 12-bit, CMOS/TTL-compatible, digital input word easily supplied by any standard digital I/O card. The DTL2A-LC optically isolates (500Vdc) the digital data, latches it, and presents it to an on-board, 12-bit, digitalto-analog (D/A) converter. The D/A output drives a near-ideal (10M min. output impedance), voltage-controlled current source. One LSB (least significant bit) of the D/A corresponds to a 5mA increment (0.025% of 20A) in load current. The DTL2A-LC guarantees a 10mA max. offset error and a 0.4% max. gain error. It has an impressive full-scale step response time of 100sec and can be updated at rates to 20kHz. The DTL2A-LC operates from a single +5V and draws a mere 150mA. It is housed in a thermally efficient, 2" x 2" x 0.5" metal package that has an aluminum baseplate with through-hole spacers for easy pcb mounting and/or heat-sink attachment. When operating with constant currents up to 20 Amps, the DTL2A-LC has an output compliance voltage of 0.6 to 50 Volts. Should the output/load voltage drop below the 0.6V minimum required for proper biasing, an internal monitoring circuit activates the DTL2A-LC's output Fault line. DATEL's electronic loads and their companion controller boards and software are outstanding building-block components for power-supply (AC/DC and DC/DC converters) and power-component (diodes, FET's, etc.) burn-in and test systems. They are an extremely reliable, cost-effective solution that enables you to quickly configure flexible, impressively accurate systems. OPTO ISOLATORS INPUT BUFFERS CONTROL STROBE (CS) +LOAD CLOCK (CLK) DATA LATCH 12-BIT D/A AMPLIFIER AND CURRENT SENSOR -LOAD LATCH DATA (LD) -LOAD +LOAD POWER DEVICE UNDER TEST SERIAL DATA INPUT (SDI) +5V SUPPLY GROUND ISOLATED DC/DC CONVERTER UNDERVOLTAGE DETECTION FAULT Figure 1. Simplified Schematic www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MDC_DTL2A-LC Page 1 of 5 100 Watt, Digitally Programmable Low-Voltage, Electronic Loads Performance Specifications and Ordering Guide Input Resolution (Bits) 12 Logic Compatibility CMOS/TTL Current (Amps) 0-20 Resolution (mA) 5 DTL Series DTL2A-LC Model Output Compliance Voltage (Volts) 0.6-50 Power (Watts) 0-100 Package (Case, Pinout) C24, P31 Model DTL2A-LC Typical at TA = +25C with nominal +5V supply voltage unless noted. The smallest increment/decrement in output current is defined by one LSB (least significant bit) of the 12-bit digital input word. One LSB is equal to full scale (FS) divided by 4096 which corresponds to 0.0244% of 20A or 4.88mA. For proper operation, the unit's output/load voltage must remain within this range. Voltages greater than the listed maximum can damage the device. Voltages less than the minimum provide insufficient bias for the output stage and will result in unpredictable or no operation. See Output Compliance Voltage and the Fault Line for details. See Performance/Functional Specifications for details. PA R T N U M B E R S T R U C T U R E M E C H A N I C A L S P E C I F I C AT I O N S DTL DATEL Electronic Load 2 A - LC Low Compliance Voltage A-Series High Reliability 0.50 (12.70) 2.00 (50.80) ALUMINUM BASEPLATE METAL CASE Case C24 Voltage Range: 2 = 0.6 to 50V 0.040 0.002 DIA. (1.016 0.051) 0.20 MIN (5.08) 1.800 (45.72) 1.640 (41.66) 0.060 0.002 DIA. (1.524 0.051) 0.10 (2.54) 0.08 (2.03) T E M P E R AT U R E D E R AT I N G 7 100 90 80 8 6 1.20 (30.48) 6 EQ. SP. @ 0.200 (5.08) 5 4 3 2 1 9 2.00 1.640 (41.66) (50.80) Output Power/Load (Watts) 10 70 60 50 40 30 20 11 0.40 (10.16) BOTTOM VIEW #4-40 CLEAR THRU (TYP. 4 PL) 0.22 (5.59) I/O Connections Pin Function P31 Fault Ground +5 Volt Supply Latch Data (LD) Serial Data In (SDI) Clock (CLK) Pin 7 8 9 10 11 Function P31 Control Strobe (CS) -Load -Load +Load +Load 1 2 0 10 20 30 40 50 60 70 80 90 100 10 Baseplate Temperature ( C) 3 4 5 The horizontal axis of the above chart references the temperature of the DTL2A-LC's aluminum baseplate. The device can continually dissipate up to 100 Watts if the baseplate is maintained at or below +50C. At +25C ambient temperature, with no heat sink or supplemental air flow, the DTL2A can reliably dissipate a continuous 10 Watts. 6 Contact DATEL for Heat Sink information. www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MDC_DTL2A-LC Page 2 of 5 Performance/Functional Specifications Typical @ TA = +25C with nominal +5V supply voltage, unless noted. 100 Watt, Digitally Programmable Low-Voltage, Electronic Loads The smallest increment/decrement in output current is defined by one LSB (least significant bit) of the 12-bit digital input word. One LSB is equal to full scale (FS) divided by 4096 which corresponds to 0.0244% of 20A or 4.88mA. For proper operation, the unit's output/load voltage must remain within this range. Voltages greater than the listed maximum can damage the device. Voltages less than than the minimum provide insufficient bias for the output stage and will result in unpredictable or no operation. See Output Compliance Voltage and the Fault Line for details. Offset error is defined as the current sunk/sourced by the DTL2A's output, under any output voltage conditions, when the digital input word is all "0's." Full scale step (20 Amps) settling to within 5mA of its final value. See Temperature Derating. Applies over all specified ranges/combinations of load voltage/current, operating temperature, and VCC. DTL Series DTL2A-LC Model Digital Inputs/Outputs Logic Compatibility (Pins 1, 4-7) Input Logic Levels: Logic "1" Logic "0" Input Logic Loading: Logic "1" (IIH @ VIH = 5 Volts) Logic "0" (IIL @ VIL = 0 Volts) Output Logic Levels: Logic "1" (@ 150A) Logic "0" (@ 1.6mA) Timing Current: Range Resolution Accuracy Voltage Range Power Range Impedance Offset Error Gain Error Isolation Voltage: Digital Inputs/Output to Load Any Pin to Case Isolation Resistance Output Slew Rate Output Settling Time Digital Input Update Rate Power Supply Range (+VCC, Pin 3) Power Supply Current Operating Temperature Storage Temperature Humidity (Non-condensing) Altitude Above Sea Level Dimensions Shielding Case Material Pin Material Mounting Holes Weight CMOS/TTL +2 Volts, minimum +0.8 Volts, maximum 20A, maximum -0.6mA, maximum +3.5 Volts, minimum +0.4 Volts, maximum See Timing Diagram Absolute Maximum Ratings Power Supply Voltage (+VCC, Pin 3) -0.5 to +5.5 Volts -0.5 to +5.5 Volts No protection No protection Yes (See Fault Line) +105C -40 to +125C +300C Output 0-20 Amps 0.024%FS (4.88mA) 3%, maximum 0.6-50 Volts 0-100 Watts 10M, minimum 10mA, maximum 0.4%, maximum 500Vdc, minimum 500Vdc, minimum 100M, minimum Digital Input Voltage (Pins 4-7) Output Reverse-Polarity Protection Output Overvoltage Protection Output Undervoltage Protection Case Temperature Storage Temperature (Ambient) Lead Temperature (Soldering, 10 sec.) These are stress ratings. Exposure of devices to 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. Dynamic Performance 10A/sec, minimum 100sec to 20kHz TECHNICAL NOTES Overview The DTL2A-LC is a digitally programmable, CMOS/TTL-compatible, serialinput current sink. It's output/load current range is 0 to 20 Amps (in 4.88mA increments), over a compliance voltage range of 0.6 to 50 Volts and an output/ load power range of 0 to 100 Watts. The device's digital I/O coding is straight binary (see table below). A digital input of all "0's" forces a load current of 0 Amps. A digital input of all "1's" forces a load current of 19.995 Amps. In a typical power-supply test or burn-in application, the output pins of the device under test (DUT) are connected to the DTL2A-LC's +Load (pins 10 and 11) and -Load (pins 8 and 9) outputs. The DTL2A-LC's operation is controlled by its four digital input lines (Serial Data In, Clock, Latch Data and Control Strobe). Serial Input Data Word MSB 1111 1100 1000 0111 0100 0010 0000 0000 1111 0000 0000 1111 0000 0000 0000 0000 LSB 1111 0000 0000 1111 0000 0000 0001 0000 Power Requirements +4.75-5.25 Volts (+5V nominal) 110mA typ., 150mA max. Environmental -40 to +100C (Case) -40 to +125C (Ambient) to 95% 10,000 feet Physical 2" x 2" x 0.5" (51 x 51 x 12.7mm) 6-sided (Connected to pin 2) Tin-plated steel shell with aluminum baseplate Brass, solder coated Through-hole spacers, #4-40 clearance 1.9 ounces (54 grams) Load Current (Amps) DTL2A 19.995 15.000 10.000 9.995 5.000 2.500 0.005 0.000 Mapping of the Serial-Input Data to Load Current www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MDC_DTL2A-LC Page 3 of 5 100 Watt, Digitally Programmable Low-Voltage, Electronic Loads Initialization Preparing the DTL2A-LC to accept new digital data is accomplished by applying logic "1's" to Control Strobe (CS, pin 7), Latch Data (LD, pin 4) and Clock (CLK, pin 6) with all signals present and stable for a minimum of 1sec. During this interval, it does not matter whether or not data is present on the Serial Data In (SDI, pin 5) line. Serial Data Following initialization, the 12-bit digital word representing the desired output current is applied to the SDI pin. The serial data should appear starting with the most significant bit (MSB, bit 1, D11) and ending with the least significant bit (LSB, bit 12, D0). With each data bit present and stable on the SDI line, the CLK must be toggled through a low-to-high transition to register that bit. Twelve rising clock edges, at rates up to 500kHz, are required to clock all 12 digital bits into the DTL2A-LC's input register. Latching Data and Presenting It to the D/A After loading the LSB, the serial data word is latched by bringing the Control Strobe (pin 7) high and then toggling the Latch Data pin (pin 4) through a high-low-high sequence. Approximately 100sec later, the output current will settle to its final desired value. Software: C Language The following steps describe a typical timing sequence when using the DTL2ALC's 4 digital inputs and a programming language such as C. Using 4 bits of a typical 8-bit port, assign BIT_0 to the Control Strobe (CS, pin 7), BIT_1 to Latch Data (LD, pin 4), BIT_2 to Serial Data In (SDI, pin 5), and BIT_3 to the Clock (CLK, pin 6). 1. Initialize with Control Strobe, Latch Data, and Clock high: BIT_0 = 1, BIT_1 = 1, BIT_2 = X (don't care), BIT_3 = 1 2. Bring the Control Strobe low. BIT_0 = 0 3. Apply the MSB (D11) of the serial data word to Serial Data In. BIT_2 = 0 or 1 -LOAD DTL Series DTL2A-LC Model Output Compliance Voltage and the Fault Line For proper operation, the DTL2A-LC's output/load voltage must always be between 0.6 and 50 Volts. The device cannot be used to directly load extremely low-voltage (<0.6V) power components or to simulate a true short circuit (0 Volts). Voltages greater than 50V can damage the device. Voltages <0.6V will result in insufficient biasing of the output current source and consequently unpredictable or no operation. Accordingly, we have installed an internal output/load-voltage monitoring circuit. If the output/load voltage drops below 0.6V and the DTL2A-LC's output is at risk of becoming disabled, the Fault line activates. The Fault line is an optically isolated, active-low function with an opencollector output (internal 10k pull-up resistor to +5V). Under normal conditions, its output is high (logic "1"). Under fault conditions (VOUT < 2.5V), its output drops to a logic "0." There is no output/load-voltage monitoring circuit for voltages greater than 50V, and operation above 50V can damage the device. An "offset supply" can be inserted between the DTL2A-LC's -Load output (pins 8 and 9) and the power device under test (DUT) to "translate" the DTL2A-LC's 49.4V output/load voltage range. The offset supply must have adequate current capabilities and be connected with the polarities indicated in Figure 2 below. Under no circumstances should the voltage across the DTL2A-LC's output be allowed to experience a polarity reversal. If a 5V/20A offset supply is inserted as shown, the range of DUT voltages will be -4.4 to +45 Volts. Such a configuration can be used for true short-circuit testing. A mechanical relay can be used to short the outputs of the DUT while the offset supply ensures the DTL2A-LC always sees at least 5 Volts across its outputs. +LOAD 11 10 + DUT 5V 9 8 - + - SHORT CIRCUIT RELAY DTL2A-LC 4. Toggle the Clock high-low-high. BIT_3 = 1 to 0 to 1 5. Apply D10 of the serial data word to Serial Data In. BIT_2 = 0 or 1 6. Toggle the Clock high-low-high. BIT_3 = 1 to 0 to 1 7. Repeat the process for remaining data bits D9 through D0. 8. Drive the Control Strobe high. BIT_0 = 1 9. Toggle the Latch Data input high-low-high. BIT_1 = 1 to 0 to 1. Figure 2. An "Offset Supply" Enables True Short-Circuit Testing Thermal Considerations The DTL2A-LC can reliably handle 100W loads if its case temperature is maintained at or below +50C. With no heat sinking or auxiliary cooling, the device can only handle loads up to 10 Watts. Please refer to the Temperature Derating Curve for additional information. DATEL's Electronic Load Applications Engineers can assist you in developing heat-sink solutions for your higher-power DTL2A-LC applications. Please contact us for details. www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MDC_DTL2A-LC Page 4 of 5 100 Watt, Digitally Programmable Low-Voltage, Electronic Loads DTL Series DTL2A-LC Model tdh SDI D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 tds tin CLK tcss tcl tch tcsh CS tld1 LD tld2 tldw Timing CLK Min. - 1 1 1 1 2 2 2 0.5 0.5 Typ. - - - - - - - - - - Max. 500 - - - - - - - - - Units kHz sec sec sec sec sec sec sec sec sec tin tcl = tch tcss tcsh tld1 tld2 tldw tds tdh Figure 3. DTL2A-LC Timing Diagram USA: UK: France: Japan: Mansfield (MA), Tel: (508) 339-3000, email: sales@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 Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Website: www.murata-ps.jp Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com 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 REGISTERED 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. Germany: Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com China: 05/01/08 www.murata-ps.com Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 MDC_DTL2A-LC Page 5 of 5 |
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