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부품번호 DTL22A 기능
기능 Voltage-Controlled
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DTL22A 데이터시트, 핀배열, 회로
NEW
www.DataSheet4U.com
®®
INNOVATION and EXCELLENCE
DTL Series
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
10Moutput 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 10M), 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
CONTROL
VOLTAGE IN (+)
CONTROL
VOLTAGE IN (–)
FAULT
+
BUFFER
AMPLIFIER
AMPLIFIER
CURRENT
DRIVER
ISOLATION
AMPLIFIER
ERROR
DETECTION
Figure 1. Simplified Schematic
+LOAD
+LOAD
–LOAD
–LOAD
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: [email protected] · Internet: www.datel.com




DTL22A pdf, 반도체, 판매, 대치품
DTL Series
100 WATT, ANALOG-CONTROLLED ELECTRONIC LOAD
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
10kpull-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.
Thermal Considerations
The DTL22A can reliably handle 100W loads if its aluminum baseplate tem-
perature 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 resis-
tor. 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 program-
mable resistance.
+LOAD
11
10
DTL22A
–LOAD
9
8
5V
–+
+
DUT
Figure 2. An "Offset Supply" Enables
True Short-Circuit Testing
SHORT
CIRCUIT
RELAY
®®
INNOVATION and EXCELLENCE
ISO 9001 REGISTERED
DS-0497 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: [email protected]
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: 6-6354-2025
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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DTL22A

Voltage-Controlled

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