Power Bipolar Transistor Base Drive Optocoupler
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
applications. 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 intermediate amplifier stage. With a CMR rating
of 10 kV/µs this optocoupler 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
• High output current:
IO2 (2.0 A Peak, 0.6 A continuous)
IO1 (1.0 A Peak, 0.5 A continuous)
• 10 kV/µs minimum Common Mode Rejection (CMR) at
VCM = 600 V
• Wide VCC range (5.4 to 13 volts)
• 2 µs typical propagation delay
• Recognized under UL 1577 for dielectric withstand proof
test voltage of 5000 vac, 1 minute
• Isolated bipolar transistor base drive
• AC and DC motor drives
• General purpose industrial inverters
• Uninterruptable power supply
ON HIGH LEVEL ON OFF
OFF LOW LEVEL OFF ON
THE USE OF A 0.1µF BYPASS
CAPACITOR CONNECTED BETWEEN
PINS 8 AND 7 IS RECOMMENDED.
ALSO, CURRENT LIMITING RESISTORS
ARE RECOMMENDED (SEE FIGURE 1,
NOTE 2, AND NOTE 7).
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.