DATEL DTL2A-LC Datasheet

E

NEW

®

INNOVATION and EX C ELL E N C

DTL Series

DTL2A-LC Model

100 Watt, Digitally Programmable

Low-Voltage, Electronic Loads

®

Features

■

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

■

10MΩ 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

Applications

■

Static/dynamic power-supply burn-in

■

Power-supply test and characterization

■

Battery capacity testing

■

Current-source testing

■

Capacitor discharge testing

■

Real-time load simulation

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, digital­to-analog (D/A) converter. The D/A output drives a near-ideal (10MΩ min. output
impedance), voltage-controlled current source. One LSB (least signifi cant 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 effi cient, 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 convert­ers) 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 confi gure fl exible,
impressively accurate systems.

INPUT

BUFFERS

CONTROL STROBE (CS)

CLOCK (CLK)

SERIAL DATA INPUT (SDI)

LATCH DATA (LD)

+5V SUPPLY

GROUND

DATEL, Inc., Mansfi eld, MA 02048 (USA) · Tel: [phone] Fax: [phone] · Email: [e-mail] · Internet: www.datel.com

ISOLATED

DC/DC

CONVERTER

OPTO

ISOLATORS

DATA

LATCH

Figure 1. Simplifi ed Schematic

12-BIT

D/A

AMPLIFIER

AND

CURRENT

SENSOR

UNDERVOLTAGE

DETECTION

+LOAD

+LOAD

–LOAD

–LOAD

POWER DEVICE

UNDER TEST

FAULT

DTL Series

0

100 WATT, LOW-VOLTAGE ELECTRONIC LOADS

Performance Specifi cations and Ordering Guide

Input

➀

Output

Compliance
Resolution Logic Current Resolution Voltage Power Package
Model (Bits) Compatibility (Amps) (mA)

➁ (Volts) ➂ (Watts) (Case, Pinout)

DTL2A-LC 12 CMOS/TTL ➃ 0-20 5 0.6-50 0-100 C24, P31

➀ Typical at TA = +25°C with nominal +5V supply voltage unless noted.
➁ The smallest increment/decrement in output current is defi ned by one LSB (least signifi cant bit) of the 12-bit

digital input word. One LSB is equal to full scale (FS) divided by 4096 which corresponds to 0.0244% of 20A or 4.88mA.
➂ 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 insuffi cient bias for the output stage

and will result in unpredictable or no operation. See Output Compliance Voltage and the Fault Line for details.
➃ See Performance/Functional Specifi cations for details.

PART NUMBER STRUCTURE

DTL 2

DATEL
Electronic Load

-

LC

A

Low Compliance Voltage

A-Series

MECHANICAL SPECIFICATIONS

2.00

(50.80)

0.50

(12.70)

Case C24

ALUMINUM BASEPLATE

METAL CASE

High Reliability

Voltage Range:

2 = 0.6 to 50V

0.20 MIN
(5.08)

0.040 ±0.002 DIA.
(1.016 ±0.051)

1.800

(45.72)

1.640

(41.66)

0.060 ±0.002 DIA.
(1.524 ±0.051)

0.10

(2.54)

0.08

(2.03)

TEMPERATURE DERATIN

10

11

BOTTOM VIEW

8

9

2.00

1.640
(50.80)

(41.66)

0.22

(5.59)

100

90

80

70

60

50

40

Output Power/Load (Watts)

30

20

10

010 2030 40 506070809010

Baseplate Temperature (°C)

The horizontal axis of the above chart references the temperature of the DTL2A-LC’s

aluminum baseplate. The device can continually dissipate up to 100 Watts if the baseplate

7

6

1.20

(30.48)

6 EQ. SP. @

0.200 (5.08)

0.40

(10.16)

5

4

3

2

1

#4-40 CLEAR THRU

(TYP. 4 PL)

I/O Connections

Pin Function P31 Pin Function P31

1 Fault 7 Control Strobe (CS)

2 Ground 8 –Load

3 +5 Volt Supply 9 –Load

4 Latch Data (LD) 10 +Load

5 Serial Data In (SDI) 11 +Load

6 Clock (CLK)

is maintained at or below +50°C. At +25°C ambient temperature, with no heat sink or

supplemental air fl ow, the DTL2A can reliably dissipate a continuous 10 Watts.

Contact DATEL for Heat Sink information.

2