DTL Series www.murata-ps.com DTL22A Model Voltage-Controlled 20 Amp 100 Watt, Electronic Loads Features ■ 0-10V input/control voltage ■ 0-20A output/load current ■ 2.5-50V output compliance voltage ■ 0-100W output/load power ■ 10MΩ output impedance ■ 500Vdc isolation ■ ±1% accuracy under all conditions ■ 200µsec full-scale step response ■ 2" x 2", shielded metal package ■ Operate in parallel for higher power Applications ■ Power-supply test and characterization ■ Static/dynamic power-supply burn-in ■ Power-resistor substitution ■ Real-time load simulation ■ Capacitor discharge testing The DTL22A is an isolated (500Vdc), near-ideal (ZIN = ZOUT ≥ 10MΩ), analog/ voltage-controlled current sink. Its 0-20A output/load current is straightforwardly "programmed" by applying a 0-10V input. The control signal can be generated by circuits as simple as the wiper of a trimpot or as sophisticated as programmable logic controllers (PLC’s) or analog-output computer I/O boards (D/A boards). The DTL22A supports any combination of IOUT = 0-20 Amps and VOUT = 2.5-50 Volts. Its thermally efficient, metal package, when properly heat sunk, can dissipate output/load power up to 100 Watts. The easy-to-use DTL22A is an excellent building block for low-cost, fully flexible, power-supply (AC/DC or DC/DC) or power-component (MOSFET’s, diodes, etc.) test and burn-in applications. It is accurate (±5mA offset error, ±1% overall accuracy), fast (200µsec full-scale step response), and capable of impressive resolution. If it is controlled with a 12-bit, 0-10V D/A converter, for example, one LSB (least significant bit) of the D/A corresponds to a 5mA change in the DTL22A’s output/load current. The DTL22A is packaged in a small (2" x 2" x 0.5"), thermally efficient metal package incorporating an aluminum baseplate with threaded inserts. It is powered by a single +5V supply and draws a mere 150mA. The DTL22A has an output compliance voltage of 2.5-50 Volts. Should the output/load voltage drop below the 2.5V required for proper biasing, an internal monitoring circuit activates the DTL22A’s output Fault line. See DATEL’s DTL22A-LC for compliance voltages as low as 0.6V. The DTL22A and other electronic loads, controller boards, and software from DATEL are outstanding building-block components for power-supply burn-in and test systems. They are extremely reliable, cost-effective solutions that enable you to quickly configure impressively accurate systems. +5 VOLT SUPPLY +5 VOLT RETURN ISOLATED DC/DC CONVERTER ISOLATED DC/DC CONVERTER +LOAD +LOAD CONTROL VOLTAGE IN (+) CONTROL VOLTAGE IN (–) + BUFFER AMPLIFIER FAULT AMPLIFIER CURRENT DRIVER – ISOLATION AMPLIFIER –LOAD ERROR DETECTION –LOAD Figure 1. Simplified Schematic www.murata-ps.com Technical enquiries email: [email protected], tel: +1 508 339 3000 MDC_DTL22A.B01 Page 1 of 4 DTL Series DTL22A Model Voltage-Controlled 20 Amp 100 Watt, Electronic Loads ➀ Performance Specifications and Ordering Guide Output Input Model Control Voltage (Volts) Impedance (Minimum) Current (Amps) Resolution (mA) ➁ Compliance Voltage (Volts) ➂ Power (Watts) Package (Case, Pinout) DTL22A 0 to +10 10MΩ 0-20 5 2.5-50 0-100 C24, P51 ➀ Typical at TA = +25°C with nominal +5V supply voltage, unless noted. ➁ Listed resolution (5mA) is for a typical application in which the DTL22A is controlled by a voltage generated by a 12-bit D/A converter with a 0-10V output range. One LSB (least significant bit) of the D/A corresponds to 0.0244% (1/4096) of full scale (20 Amps), which equals approximately 5mA. ➂ 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. M E C H A N I C A L S P E C I F I C AT I O N S PA R T N U M B E R S T R U C T U R E DTL 22 A A-Series High Reliability DATEL Electronic Load Case C24 Voltage Range: 22 = 2.5 to 50V T E M P E R AT U R E D E R AT I N G 100 90 Output Power/Load (Watts) 80 70 60 50 40 30 I/O Connections 20 10 0 10 20 30 40 50 60 70 80 90 100 Baseplate Temperature (°C) The horizontal axis of the above chart references the temperature of the DTL22A’s aluminum baseplate. The device can continually dissipate up to 100 Watts if the baseplate is maintained at or below +50°C. At +25°C ambient temperature, with no heat sink or supplemental air flow, the DTL22A can reliably dissipate a continuous 10 Watts. Pin Function P51 Pin Function P51 1 +5 Volt Supply 7 Control Voltage In (–) 2 +5 Volt Return 8 –Load 3 Fault 9 –Load 4 No Pin 10 +Load 5 Control Voltage In (+) 11 +Load 6 No Pin Contact DATEL for Heat Sink information. www.murata-ps.com Technical enquiries email: [email protected], tel: +1 508 339 3000 MDC_DTL22A.B01 Page 2 of 4 DTL Series DTL22A Model Voltage-Controlled 20 Amp 100 Watt, Electronic Loads Performance/Functional Specifications Typical @ TA = +25°C with nominal +5V supply voltage, unless noted. Input Control Voltage 0-10 Volts Impedance 10MΩ, minimum Output Transfer Function IOUT (Amps) = 2VIN (Volts) Current: Range Resolution ➀ Offset Error ➁ Gain Error Absolute Accuracy ➂ 0-20 Amps 0.025%FS (5mA) ±5mA, maximum ±0.25%, maximum ±1%, maximum Voltage ➃ 2.5-50 Volts Power ➄ 0-100 Watts Impedance 10MΩ, minimum Isolation Voltage: Analog Input to ±Load +5V Power to Input or ±Load Any Pin to Case 500Vdc, minimum 500Vdc, minimum 500Vdc, minimum Isolation Resistance 100MΩ, minimum Fault Logic Levels: Logic "1" (@ 150µA) Logic "0" (@ 1.6mA) +3.5 Volts, minimum +0.4 Volts, maximum Dynamic Performance ➀ Listed resolution (5mA) is for a typical application in which the DTL22A is controlled by a voltage generated by a 12-bit D/A converter with a 0-10V output range. One LSB (least significant bit) of the D/A corresponds to 0.0244% (1/4096) of full scale (20 Amps), which equals approximately 5mA. ➁ Offset error is defined as the current sunk/sourced by the DTL22A’s output, under any output-voltage conditions, when the applied control voltage is 0 Volts. ➂ Applies over all ranges/combinations of specified output current, load voltage, output power, operating temperature and VCC. ➃ For proper operation, the DTL22A's output voltage must remain within the range listed. Voltages greater than the listed maximum can damage the device. Voltages less than the listed minimum provide insufficient bias for the output stage and will result in unpredictable or no operation. See Ouput Compliance Voltage and the Fault Line for details. ➄ The DTL22A can achieve its maximum output/load power only when its baseplate temperature is properly maintained. See Temperature Derating. ➅ Specified for the full-scale step from 10mA to 20 Amps settling to ±1% (±200mA) of final value. A minimal loading of 10mA is recommended to achieve the fastest dynamic response. ➆ Baseplate temperature. See Note 5 and Temperature Derating. Absolute Maximum Ratings Supply Voltage (+VCC, Pin 1) –0.5 to +5.5 Volts Input Voltage (Pin 4) –0.5 to 15 Volts Output Reverse-Polarity Protection No protection Output Overvoltage Protection No protection Output Undervoltage Protection Yes (See Fault Line) Case Temperature +85°C Output Slew Rate 0.4A/µsec, minimum Storage Temperature (Ambient) –40 to +85°C Output Settling Time ➅ 200µsec Lead Temperature (Soldering, 10 sec.) +300°C Dynamic Loading: ➅ 10mA to 20A 0 to 20A 5kHz 1kHz 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. Power Requirements Power Supply Range (+VCC, Pin 1) +4.75-5.25 Volts (+5V nominal) Power Supply Current 110mA typ., 150mA max. TECHNICAL NOTES Environmental Operating Temperature ➆ –25 to +85°C Storage Temperature –40 to +85°C Humidity (Non-condensing) to 95% Altitude Above Sea Level 10,000 feet Physical Dimensions 2" x 2" x 0.5" (51 x 51 x 12.7mm) Shielding 6-sided Case Material Tin-plated steel shell with aluminum baseplate Pin Material Brass, solder coated Mounting Holes Through-hole spacers, #4-40 clearance Weight 1.9 ounces (54 grams) www.murata-ps.com Overview The DTL22A is an analog programmable (0 to +10V control) current sink. It’s output/load current range is 0 to 20 Amps over a compliance voltage range of 2.5 to 50 Volts and an output/load power range of 0 to 100 Watts. The device’s transfer function is as follows: Iout (Amps) = 2VIN (Volts) Examples: Control VIN = 1 Volt, IOUT = 2 Amps Control VIN = 10 Volts, IOUT = 20 Amps In a typical power-supply test or burn-in application, the "positive" output and "return" pins of the device under test (DUT) are connected to the DTL22A’s +Load (pins 10 and 11) and –Load (pins 8 and 9) outputs. Technical enquiries email: [email protected], tel: +1 508 339 3000 MDC_DTL22A.B01 Page 3 of 4 DTL Series DTL22A Model Voltage-Controlled 20 Amp 100 Watt, Electronic Loads Thermal Considerations TECHNICAL NOTES Output Compliance Voltage and the Fault Line For proper operation, the DTL22A’s output/load voltage must always be between 2.5 and 50 Volts. The device cannot be used to directly load extremely low-voltage (such as 1.5V or 1.8V) power components or to simulate a true short circuit (0 Volts). Voltages greater than 50V can damage the device. Voltages <2.5V 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 2.5V and the DTL22A’s output is at risk of becoming disabled, the Fault line activates. The Fault line is an active-low function with an open-collector output (internal 10kΩ 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 DTL22A’s –Load output (pins 8 and 9) and the power device under test (DUT) to "translate" the DTL22A’s 47.5V 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 DTL22A’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 –2.5 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 DTL22A always sees at least 5 Volts across its outputs. The DTL22A can reliably handle 100W loads if its aluminum baseplate temperature is maintained at or below +50°C. 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 DTL22A applications. Contact us for details about our DTL-HS100D12 heat sinks. Constant-Resistance Application The DTL22A operates as a constant-current electronic load in its typical configuration. A constant-resistance mode of operation can be achieved as follows: The DTL22A has a high-impedance, isolated analog input that permits the inputs to be connected directly across the load. The DTL22A sinks 20 Amps for a 10 Volt full-scale input or I = 2 × VIN. If you make VIN = VLOAD, (the voltage across the load), then R = VLOAD /I = VLOAD / (2 × VLOAD ) = 0.5 Ohms. Consequently, the load looks like a 0.5 Ohm resistor. Furthermore, if you make VIN = k × VLOAD by connecting a potentiometer or resistive divider across the load, then R = VLOAD / (2 × k × VLOAD) = 0.5/k. Adjusting the potentiometer effectively gives you an adjustable power resistor. At k = 0.5, R = 1 Ohm; at k = 0.25, R = 2 Ohms, etc. The only limitations you must observe are the maximum load voltage (50V) and the maximum100 Watt power dissipation. A multiplying digtal-to-analog converter or a digital potentiometer can also be used to effectively make a programmable resistance. 11 +LOAD 10 + DTL22A DUT 5V 9 –LOAD – + SHORT CIRCUIT RELAY – 8 Figure 2. An "Offset Supply" Enables True Short-Circuit Testing USA: 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: [email protected] ISO 9001 and 14001 REGISTERED 03/20/09 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. © 2009 Murata Power Solutions, Inc. www.murata-ps.com Mansfield (MA), Tel: (508) 339-3000, email: [email protected] Canada: Toronto, Tel: (866) 740-1232, email: [email protected] UK: Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected] France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected] Germany: München, Tel: +49 (0)89-544334-0, email: [email protected] Japan: Tokyo, Tel: 3-3779-1031, email: [email protected] Osaka, Tel: 6-6354-2025, email: [email protected] China: Shanghai, Tel: +86 215 027 3678, email: [email protected] Guangzhou, Tel: +86 208 221 8066, email: [email protected] Singapore: Parkway Centre, Tel: +65 6348 9096, email: [email protected] Technical enquiries email: [email protected], tel: +1 508 339 3000 MDC_DTL22A.B01 Page 4 of 4