GA11-300-48 - Semiconductor Circuits, Inc.

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All specifications are typical at nominal line and full load at 25°C unless

otherwise noted and are subject to change without notice.

15 Watts

Single/Dual Outputs

! 4:1 ultra wide input range

! Remote shutdown

! 100kHz switching frequency

! Continuous short circuit

protection

! Six-sided shielding

The GA series is an economically

priced 15 watt DC/DC converter

featuring ultra-wide input range,

efficiencies to 85% and a continuous

six-sided shielded case. Low ESR

capacitors are used both on the input

and the output(s) to minimize the

conductive noise. Other key features

include: overvoltage protection, output

trim adjustability, TTL and CMOS

compatible remote on/off, short circuit

protection and small size. The GA

series measures only 1.6” x 2.0” x 0.40”

and offers a power density of 11.7

watts/cu. in.

Applications

These units are ideally suited for

telecommunications, distributed power

systems, automatic test equipment,

geosource test equipment and process

control.

GA Series

INPUT

Voltage Range 20-72Vdc

Filtering All Models

Reverse Polarity Protected To Nominal Input Current

External Fuse Required

Remote On/Off Control All Models

OUTPUT

Voltage Tolerance ± 1%

Ripple and Noise 75mV pk-pk

Short Circuit Protection Continuous Power Cycle

Temperature Coefficient 0.02% / °C

GENERAL

Regulation:

Line 0.5%

Load 2.0%

Efficiency 80-85% (typ)

I/O Isolation 500 Vdc

Switching Frequency 100khz (typ)

ENVIRONMENTAL

Operating Temperature -25°C to +60°C

Storage Temperature -25°C to +105°C

Cooling Free-air Convection

249 Range Road Windham, NH 03087 (603) 893-2330 FAX (603) 893-6280

GA Series Ordering Information

Dimensions and Connections

Input Voltage Output Output Model

Range Voltage Current Number

20-72 Vdc 5 Vdc 3000mA GA11-300-48

20-72 Vdc 12 Vdc 1250mA GA12-125-48

20-72 Vdc 15 Vdc 1000mA GA13-100-48

20-72 Vdc ±12Vdc ±625mA GA22-125-48

20-72 Vdc ±15Vdc ±500mA GA23-100-48

External Output Trimming: Output may be externally

trimmed ±10%.

Remote ON/Off Control (pin 4) common referenced

to - Input (pin 2).

On greater than 4 Vdc or open circuit

Off less than 1.2 Vdc

PIN CONNECTIONS

Single Output

1. +Input

2. -Input

3. No Pin

4. Remote On/Off

5. No Pin

6. +Output

7. Common

8. Trim

NOTES:

1. Ripple measured with a 3.3 mf tantalum capacitor

across each output.

2. Load regulation from full load to minimum load

(25%).

3. The GA series requires an external filter capacitor

across the input valued at 33µF @ 100Vdc, which

must withstand 600ma of ripple current such as

Sprague type 672D.

4. Metal case (shield) is connected to pin 1.

PIN CONNECTIONS

dual Outputs

1. +Input

2. -Input

3. No Pin

4. Remote On/Off

5. +Output

6. Common

7. -Output

8. Trim 11/01/2001