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| Preliminary (R) (R) INNOVATION and EXCELLENCE DTL Series DTL24A Model Voltage-Controlled, 10 Amp 100 Watt, Electronic Loads Features 0-10V Input/control voltage 0-10A output/load current 2.5-150V output compliance voltage 0-100W output/load power 10M output impedance 500Vdc Isolation 1% accuracy under all conditions 200sec full-scale step response 2" x 2", shielded metal package Operate in parallel for higher power The DTL24A is an isolated (500Vdc), near-ideal (Zin = ZOUT >= 10M), analog/voltage-controlled current sink. It's 0-10A ouput/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 DTL24A supports any combination of IOUT = 0-10 Amps and VOUT = 2.5-150 Volts. Its thermally efficient, metal package, when properly heat sunk, can dissipate output/load power up to 100 Watts. The easy-to-use DTL24A 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 (200sec 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 2.5mA change in the DTL24A's output/load current. The DTL24A is packaged in a small (2" x 2" x 0.5"), thermally efficient metal package incorporating an aluminum baseplate with through-hole mounting inserts. It is powered by a single +5V supply and draws a mere 150mA. The DTL24A has an output compliance voltage of 2.5-150 Volts. Should the output/load voltage drop below the 2.5V required for proper biasing, an internal monitoring circuit activates the DTL24A's output Fault line. See DATEL's DTL22A-LC for compliance voltages as low as 0.6V. The DTL24A 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. Applications Power-supply test and characterization Static/dynamic power-supply burn-in Power-resistor substitution Real-time load simulation Capacitor discharge testing Figure 1. Simplified Schematic DATEL, Inc. Mansfield, MA 02048 (USA) * Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 * Email: sales@datel.com * Internet: www.datel.com DTL Series Performance Specifications and Ordering Guide Input Model DTL24A Control Voltage (Volts) 0 to +10V Impedance (Minimum) 10M Current (Amps) 0-10 100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD Output Output Resolution (mA) 2.5 Compliance Voltage (Volts) 2.5-150 Power (Watts) 0-100 Package (Case, Pinout) C24, P51 Typical at TA = +25C with nominal +5V supply voltage, unless noted. Listed resolution (2.5mA) is for a typical application in which the DTL24A 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 (10 Amps), which equals approximately 2.5mA. 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. PART NUMBER STRUCTURE MECHANICAL SPECIFICATIONS DTL DATEL Electronic Load DTL 22A 24 22A A A-Series Voltage Range: 24 = 2.5 to 150V High Reliability TEMPERATURE DERATING Output Power/Load (Watts) Pin Baseplate Temperature (C) Baseplate Temperature (C) Function P51 +5 Volt Supply +5 Volt Return Fault No Pin I/O Connections Pin Function P51 7 8 9 10 11 Control Voltage In (-) -Load -Load +Load +Load 1 2 3 4 5 6 The horizontal axis of the above chart references the temperature of the DTL24A'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 supplemenatal air flow, the DTL24A can reliably dissipate a continuous 10 Watts. Control Voltage In (+) No Pin Contact DATEL for Heat Sink information. 2 100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD Performance/Functional Specifications Typical @ TA = +25C with nominal +5V supply voltage, unless noted. DTL24A Input Control Voltage Impedance Transfer Function Current: Range 0-10 Volts 10 M, minimum Output IOUT (Amps) = 1 x VIN (Volts) Resolution Offset Error Gain Error Absolute Accuracy Voltage Power Isolation Voltage: Analog Input to Load +5V Power to Input or Load Any pin to case Isolation Resistance Fault Logic Levels: Logic "1" (@150A) Logic "0" (@1.6 mA) Output Slew Rate: Output Settling Time Dynamic Loading: 10mA to 10A 0 to 10A 0-10 Amps 0.025%FS (2.5 mA) 5 mA 0.25%, maximum 1%, maximum 2.5-150 Volts 0-100 Watts 500Vdc, minimum 500Vdc, minimum 500Vdc, minimum 100M, minimum +3.5 Volts, minimum +0.4 Volts, maximum Listed resolution (2.5mA) is for a typical application in which the DTL24A 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 (10 Amps), which equals approximately 2.5mA. Offset error is defined as the current sunk/sourced by the DTL24A's output, under any output-voltage conditions, when the applied control voltage is 0 Volts. Applies over all ranges/combinations of specified output current, load voltage, output power, operating temperature and VCC. For proper operation, the DTL24A'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 Output Compliance Voltage and Fault Line for details. The DTL24A can achieve its maximum output/load power only when its baseplate temperature is properly maintained. See Temperature Derating. Specified for the full-scale step from 10mA to 10 Amps settling to 1% (100mA) of final value. A minimal loading of 10mA is recommended to achieve the fastest dynamic response. Baseplate temperature. See Note 5 and Temperature Derating. Absolute Maximum Ratings Power Supply Voltage (+Vcc, Pin 1) Control Voltage In (Pin 5) Output Reverse-Polarity Protection Output Overvoltage Protection Output Undervoltage Protection Case Temperature Storage Temperature Lead Temperature (soldering, 10 sec.) -0.5 to +5.5 Volts -0.5 to +15 Volts No protection No protection Yes (See Fault Line) +85C -40 to +85C +300C Dynamic Performance 0.4 A/sec, minimum 200 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. Power Requirements +4.75-5.25 Volts (+5V nominal) 110mA typ., 150mA max. 5 kHz 1 kHz TECHNICAL NOTES Power Supply Range (+Vcc, Pin1) Power Supply Current Operating Temperature Storage Temperature Humidity (Non-condensing) Altitude Above Sea Level Operating Tem Dimensions Shielding Case Material Pin Material Mounting Holes Weight Overview The DTL24A is an analog programmable (0 to +10V control) current sink. Its output/load current range is 0 to 10 Amps over a compliance voltage range of 2.5 to 150 Volts and an output/load power range of 0 to 100 Watts. The device's transfer function is as follows: Iout (Amps) = 1 x VIN (Volts) Examples: Control VIN = 1 Volt, IOUT = 1 Amps Control VIN = 10 Volts, IOUT = 10 Amps In a typical power-supply test or burn-in application, the output pins of the device under test (DUT) are connected to the DTL24A's +Load (pins 10 and 11) and -Load (pins 8 and 9) outputs. Environmental -25 to +85C -40 to +85C to 95% 10,000 feet Physical 2" x 2" x 0.5" (51 x 51 x 12.7 mm) Six-sided Tin-plated steel shell with aluminum baseplate Brass, solder coated Through-hole spacers, #4-40 clearance 1.9 ounces (54 grams) 3 DTL Series TECHNICAL NOTES 100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD Output Compliance Voltage and the Fault Line For proper operation, the DTL24A's output/load voltage must always be between 2.5 and 150 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 150V 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 DTL24A'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 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 150V, and operation above 150V can damage the device. An "offset supply" can be inserted between the DTL24A's -Load output (pins 8 and 9) and the power device under test (DUT) to "translate" the DTL24A's 147.5V 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 DTL24A's output be allowed to experience a polarity reversal. If a 5V/10A offset supply is inserted as shown, the range of DUT voltages will be -2.5 to +145 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 DTL24A always sees at least 5 Volts across its outputs. Thermal Considerations The DTL24A can reliably handle 100W loads if its aluminum baseplate 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 heatsink solutions for your higher-power DTL24A applications. Please contact us for details and concerning our DTL-HS100D12 heat sink. Constant Resistance Application The DTL24A operates as a constant current electronic load in its typical configuration. A constant resistance mode of operation can be achieved as follows: The DTL24A has a high impedance isolated analog input, that allows the analog inputs to be connected directly across the load. The DTL24A sinks 10 amps for a 10V full scale input or I = 1 x VIN. If you make VIN = VLOAD (the voltage across the load), then R = VLOAD/I = VLOAD / (1 x VLOAD) = 1.0 Ohms. Consequently, the load looks like a 1.0 Ohm resistor. Furthermore, if you make VIN = k x VLOAD by connecting a potentiometer or resistive divider across the load, then R = VLOAD / (1 x k x VLOAD) = 1/k so adjusting the potentiometer will give you an adjustable power resistor e.g. at K = 1, then R = 1 Ohm, k = 0.5 then R = 2 Ohms, etc. The only limitation that you must observe is the maximum load voltage (150V) and 100 watt power dissipation. A multiplying digital-to-analog converter, or a digital potentiometer could be utilized to make a programmable resistance. Figure 2. An "offset Supply" Enables True Short-Circuit Testing (R) (R) INNOVATION and EXCELLENCE ISO-9001 REGISTERED DS-0xxx 5/01 DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: sales@datel.com DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark. 4 |
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