1-329

Power Bipolar Transistor

Base Drive Optocoupler

Technical Data

Features

• High Output Current

I

Continuous)

I

Continuous)

• 1.5 kV/

Mode Rejection (CMR) at

V

• Wide V

Volts)

• 2

Delay

• Recognized under UL 1577

for Dielectric Withstand

Proof Test Voltage of 5000

Vac, 1 Minute

Applications

• Isolated Bipolar Transistor

Base Drive

• AC and DC Motor Drives

• General Purpose Industrial

Inverters

• Uninterruptable Power

Supply

Description

The HCPL-3000 consists of a

Silicon-doped GaAs LED optically

coupled to an integrated circuit

with a power output stage. This

optocoupler is suited for driving

power bipolar transistors and

power Darlington devices used in

motor control inverter applica-

tions. The high peak and steady

state current capabilities of the

output stage allow for direct

interfacing to the power device

without the need for an interme-

diate amplifier stage. With a CMR

rating of 1.5 kV/

µs this optocoup-

ler readily rejects transients found

in inverter applications.

The LED controls the state of the

output stage. Transistor Q2 in the

output stage is on with the LED

off, allowing the base of the

power device to be held low.

Turning on the LED turns off

transistor Q2 and switches on

transistor Q1 in the output stage

which provides current to drive

the base of a power bipolar

device.

Functional Diagram

CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to

prevent damage and/or degradation which may be induced by ESD.

THE USE OF A 0.1

µF BYPASS CAPACITOR CONNECTED BETWEEN PINS 8 AND 7 IS RECOMMENDED. ALSO, CURRENT LIMITING

RESISTORS ARE RECOMMENDED (SEE FIGURE 1, NOTE 2, AND NOTE 7).

HCPL-3000

H

GND

ANODE

CATHODE

Q2

Q1

8

7

6

5

1

2

3

4

HCPL-3000

TRUTH TABLE

LED

ON

OFF

OUTPUT

HIGH LEVEL

LOW LEVEL

Q1

ON

OFF

Q2

OFF

ON

5965-3584E