DTL23A Ver la hoja de datos (PDF) - Unspecified

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DTL23A

Voltage-Controlled, 2 Amp 100 Watt, Electronic Loads

Unspecified 

DTL Series

100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD

TECHNICAL NOTES

Output Compliance Voltage and the Fault Line

For proper operation, the DTL23A's output/load voltage must always be between

2.5 and 200 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 200V 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 DTL23A'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

200V, and operation above 200V can damage the device.

An "offset supply" can be inserted between the DTL23A's -Load output (pins

8 and 9) and the power device under test (DUT) to "translate" the DTL23A's

197.5V 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 DTL23A's output be

allowed to experience a polarity reversal.

If a 5V/2.0A offset supply is inserted as shown, the range of DUT voltages will

be -2.5 to +195 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 DTL23A always sees at least 5 Volts across its

outputs.

Thermal Considerations

The DTL23A 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 DTL23A applications. Please contact

us for details and concerning our DTL-HS100D12 heat sink.

Constant Resistance Application

The DTL23A operates as a constant current electronic load in its typical

configuration. A constant resistance mode of operation can be achieved

as follows:

The DTL23A has a high impedance isolated analog input, that allows the

analog inputs to be connected directly across the load. The DTL23A sinks

2.0 amps for a 10V full scale input or I = 0.2 x VIN. If you make VIN = VLOAD

(the voltage across the load), then R = VLOAD/I = VLOAD / (0.2 x VLOAD) = 5

Ohms. Consequently, the load looks like a 5 Ohm resistor.

Furthermore, if you make VIN = k x VLOAD by connecting a potentiometer or

resistive divider across the load, then R = VLOAD / (0.2 x k x VLOAD) = 5/k so

adjusting the potentiometer will give you an adjustable power resistor e.g. at

K = 5, then R = 1 Ohm, k = 2.5 then R = 2 Ohms, etc. The only limitation

that you must observe is the maximum load voltage (200V) 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

®

®

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 München, 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.

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