DATEL DTL2A Datasheet

E

NEW

®

INNOVATION and EX C ELL E N C

DTL Series

DTL2A Model

100 Watt, Digitally Programmable

Serial-Input, Electronic Loads

®

Features

■

12-bit, optically isolated (500Vdc),
CMOS/TTL-compatible serial input

■

0-20 Amp output in 5mA increments

■

10MΩ minimum output impedance

■

Output voltage to 50 Volts

■

Output power to 100 Watts

■

±5mA offset error; ±0.1% gain error

■

100µsec full-scale step response

■

Update rates to 20kHz

■

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 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 effi cient, 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 signifi cant 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
confi gure 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, SERIAL-INPUT ELECTRONIC LOADS

Performance Specifi cations and Ordering Guide

➀

Input Output

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

➁ (Volts) ➂ (Watts) (Case, Pinout)

DTL2A 12 CMOS/TTL ➃ 0-20 5 2.5-50 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

A

A-Series

High Reliability

MECHANICAL SPECIFICATIONS

2.00

(50.80)

0.50

(12.70)

Case C24

ALUMINUM BASEPLATE

METAL CASE

Voltage Range:

2 = 2.5 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 DERATING

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 203040506070809010

Baseplate Temperature (°C)

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

num 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