Preliminary
®
®
INNOVATION and EXCELLENCE
DTL Series
DTL23A Model
Voltage-Controlled, 2 Amp
100 Watt, Electronic Loads
Features
0-10V Input/control voltage
0-2A output/load current
2.5-200V 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
The DTL23A is an isolated (500Vdc), near-ideal (Zin = Z
OUT
>= 10MΩ), analog/voltage-controlled
current sink. It's 0-2.0A 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 DTL23A supports any combination of I
OUT
= 0-2.0 Amps and V
OUT
= 2.5-200 Volts.
Its thermally efficient, metal package, when properly heat sunk, can dissipate output/load power up
to 100 Watts.
The easy-to-use DTL23A 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 0.5mA change in the DTL23A's
output/load current.
The DTL23A 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 DTL23A has an output compliance voltage of 2.5-200 Volts. Should the output/load voltage
drop below the 2.5V required for proper biasing, an internal monitoring circuit activates the DTL23A's
output Fault line. See DATEL's DTL22A-LC for compliance voltages as low as 0.6V.
The DTL23A 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
DTL23A
Control
Voltage
(Volts)
0 to +10V
Impedance
(Minimum)
10MΩ
Current
(Amps)
0-2.0
100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD
Output
Output
Resolution
(mA)
0. 5
Compliance
Voltage
(Volts)
2.5-200
Power
(Watts)
0-100
Package
(Case, Pinout)
C24, P51
Typical at T
A
= +25°C with nominal +5V supply voltage, unless noted.
Listed resolution (0.5mA) is for a typical application in which the DTL23A 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 (2.0 Amps), which equals approximately 0.5mA.
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
23
22A
A
High Reliability
A-Series
23 = 2.5 to 200V
Voltage Range
TEMPERATURE DERATING
Output Power/Load (Watts)
Pin
Baseplate Temperature (°C)
Baseplate Temperature (°C)
I/O Connections
Function P51
Pin
Function P51
+5 Volt Supply
+5 Volt Return
Fault
No Pin
Control Voltage In (+)
No Pin
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 DTL23A'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 supplemenatal air
flow, the DTL23A can reliably dissipate a continuous 10 Watts.
Contact DATEL for Heat Sink information.
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100 WATT, VOLTAGE-CONTROLLED ELECTRONIC LOAD
Performance/Functional Specifications
Typical @ TA = +25°C with nominal +5V supply voltage, unless noted.
DTL23A
Input
Control Voltage
Impedance
Transfer Function
Current:
Range
0-10 Volts
10 MΩ, minimum
Output
I
OUT
(Amps) =
0.2 V
IN
(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" (@150µA)
Logic "0" (@1.6 mA)
Output Slew Rate:
Output Settling Time
Dynamic Loading:
10mA to 2.0A
0 to 2.0A
0-2.0 Amps
0.025%FS (0.5 mA)
±5 mA
±0.25%, maximum
±1%, maximum
2.5-200 Volts
0-100 Watts
500Vdc, minimum
500Vdc, minimum
500Vdc, minimum
100MΩ, minimum
+3.5 Volts, minimum
+0.4 Volts, maximum
Listed resolution (0.5mA) is for a typical application in which the DTL23A 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 (2.0 Amps), which
equals approximately 0.5mA.
Offset error is defined as the current sunk/sourced by the DTL23A'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 V
CC
.
For proper operation, the DTL23A'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 DTL23A 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 2.0 Amps settling to ±1% (±20mA) 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)
+85°C
–40 to +85°C
+300°C
Dynamic Performance
0.4 A/µsec, minimum
200 µsec
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 DTL23A is an analog programmable (0 to +10V control) current sink. Its
output/load current range is 0 to 2.0 Amps over a compliance voltage range of
2.5 to 200 Volts and an output/load power range of 0 to 100 Watts. The device's
transfer function is as follows:
Iout (Amps) = 0.2V
IN
(Volts)
Examples: Control V
IN
= 1 Volt, I
OUT
= 0.2 Amps
Control V
IN
= 10 Volts, I
OUT
= 2.0 Amps
In a typical power-supply test or burn-in application, the output pins of the
device under test (DUT) are connected to the DTL23A's +Load (pins 10 and 11)
and -Load (pins 8 and 9) outputs.
Environmental
-25 to +85°C
-40 to +85°C
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 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 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.
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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