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Figure 1. Simplified Schematic
NEW
ISOLATED
DC/DC
CONVERTER
12-BIT
D/A
DATA
LATCH
AMPLIFIER
AND
CURRENT
SENSOR
+LOAD
+LOAD
–LOAD
–LOAD
CONTROL STROBE (CS)
CLOCK (CLK)
INPUT
BUFFERS
OPTO
ISOLATORS
SERIAL DATA INPUT (SDI)
LATCH DATA (LD)
GROUND
+5V SUPPLY
UNDERVOLTAGE
DETECTION
POWER DEVICE
UNDER TEST
FAULT
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
DTL2A-LC Model
100 Watt, Digitally Programmable
Low-Voltage, Electronic Loads
DATEL’s new DTL2A-LC is an optically isolated, digitally programmable, serial-
input electronic load designed for use in burn-in, characterization and test of today’s
low-voltage power supplies and power components. The DTL2A-LC is essentially a
digitally controlled current source that can sink currents from 0 to 20 Amps, at loading
voltages as low as 0.6 Volts, up to a maximum power of 100 Watts.
The DTL2A-LC accepts a serialized, 12-bit, CMOS/TTL-compatible, digital input
word easily supplied by any standard digital I/O card. The DTL2A-LC optically isolates
(500Vdc) the digital data, latches it, and presents it to an on-board, 12-bit, digital-
to-analog (D/A) converter. The D/A output drives a near-ideal (10M
Ω min. output
impedance), voltage-controlled current source. One LSB (least significant bit) of the
D/A corresponds to a 5mA increment (0.025% of 20A) in load current. The DTL2A-LC
guarantees a ±10mA max. offset error and a ±0.4% max. gain error. It has an impressive
full-scale step response time of 100µsec and can be updated at rates to 20kHz.
The DTL2A-LC operates from a single +5V and draws a mere 150mA. It is housed
in a thermally efficient, 2" x 2" x 0.5" metal package that has an aluminum baseplate
with through-hole spacers for easy pcb mounting and/or heat-sink attachment.
When operating with constant currents up to 20 Amps, the DTL2A-LC has an
output compliance voltage of 0.6 to 50 Volts. Should the output/load voltage drop below
the 0.6V minimum required for proper biasing, an internal monitoring circuit activates the
DTL2A-LC's output Fault line.
DATEL’s electronic loads and their companion controller boards and software are
outstanding building-block components for power-supply (AC/DC and DC/DC convert-
ers) and power-component (diodes, FET’s, etc.) burn-in and test systems. They are an
extremely reliable, cost-effective solution that enables you to quickly configure flexible,
impressively accurate systems.
12-bit, optically isolated (500Vdc),
CMOS/TTL-compatible serial input
Output load voltages as low as 0.6 Volts
Output current 0-20A in 5mA increments
Output power to 100 Watts
10M
Ω minimum output impedance
±10mA offset error; ±0.4% gain error
100µsec full-scale step response
Operate in parallel for higher power
Miniature, 2" x 2" metal package
Static/dynamic power-supply burn-in
Power-supply test and characterization
Battery capacity testing
Current-source testing
Capacitor discharge testing
Real-time load simulation
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