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參數(shù)資料
| 型號： | DTL23A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Voltage-Controlled, 2 Amp 100 Watt, Electronic Loads |
| 中文描述： | 電壓控制，2安培100瓦，電子負載 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 653K |
| 代理商： | DTL23A |
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.
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, 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
INNOVATION and EX C ELL E N C E
ISO-9001 REGISTERED
DS-0xxx 5/01
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
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
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.
Figure 2. An "offset Supply" Enables
True Short-Circuit Testing
4
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 V
IN
. If you make V
IN
= V
LOAD
(the voltage across the load), then R = V
LOAD
/I = V
LOAD
/ (0.2 x V
LOAD
) = 5
Ohms. Consequently, the load looks like a 5 Ohm resistor.
Furthermore, if you make V
IN
= k x V
LOAD
by connecting a potentiometer or
resistive divider across the load, then R = V
LOAD
/ (0.2 x k x V
LOAD
) = 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.
DTL Series
100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD
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