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DTL2A

100 Watt, Digitally Programmable Serial-Input, Electronic Loads

DATEL Data Acquisition products  

NEW

®

®

INNOVATION and EXCELLENCE

DTL Series

DTL2A Model

100 Watt, Digitally Programmable

Serial-Input, Electronic Loads

Features

I 12-bit, optically isolated (500Vdc),

CMOS/TTL-compatible serial input

I 0-20 Amp output in 5mA increments

I 10MΩ minimum output impedance

I Output voltage to 50 Volts

I Output power to 100 Watts

I ±5mA offset error; ±0.1% gain error

I 100µsec full-scale step response

I Update rates to 20kHz

I Operate in parallel for higher power

I Miniature, 2" x 2" metal package

Applications

I Static/dynamic power-supply burn-in

I Power-supply test and characterization

I Battery capacity testing

I Current-source testing

I Capacitor discharge testing

I Real-time load simulation

DATEL’s new DTL2A is an optically isolated, digitally programmable, serial-input,

electronic load. It is essentially a digitally controlled current source that can sink

currents from 0 to 20 Amps, at loading voltages from 2.5 to 50 Volts, up to a maximum

power of 100 Watts. The DTL2A is packaged in a thermally efficient, 2" x 2" x 0.5"

metal package that incorporates an aluminum baseplate with through-hole spacers

for easy pcb mounting and/or external heat-sink attachment.

The DTL2A accepts a serialized, 12-bit, CMOS/TTL-compatible, digital input word

easily generated by any standard digital I/O card. The DTL2A buffers and then

optically isolates (500Vdc) the digital input data before storing it in a register and

presenting it to an on-board, 12-bit, digital-to-analog (D/A) converter. The D/A output

drives a near-ideal (10MΩ minimum output impedance), voltage-controlled current

source. One LSB (least significant bit) of the D/A converter corresponds to a 5mA

increment (0.025% of 20A) in load current.

The DTL2A features a max. ±5mA offset error and a max. ±0.1% gain error. It

has an impressive full-scale step response time of 100µsec and can be operated

dynamically at update rates up to 20kHz. Powered by a single +5V supply, the DTL2A

draws a mere 150mA (maximum).

While operating in the constant-current mode up to 20 Amps (100W max. power),

the output compliance voltage of the DTL2A is 2.5 to 50 Volts. Should the output/load

voltage drop below the 2.5V minimum required for proper biasing, an internal monitoring

circuit activates the DTL2A's output Fault line. See DATEL’s DTL2A-LC for compliance

voltages as low as 0.6V.

DTL2A’s 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 an extremely reliable, cost-effective solution that enables you to quickly

configure impressively accurate systems.

CONTROL STROBE (CS)

INPUT

BUFFERS

OPTO

ISOLATORS

CLOCK (CLK)

SERIAL DATA INPUT (SDI)

DATA

LATCH

LATCH DATA (LD)

12-BIT

D/A

AMPLIFIER

AND

CURRENT

SENSOR

+5V SUPPLY

GROUND

ISOLATED

DC/DC

CONVERTER

UNDERVOLTAGE

DETECTION

Figure 1. Simplified Schematic

+LOAD

+LOAD

–LOAD

–LOAD

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

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