HCPL3150 datasheet(10/15 Pages) HP

10 / 15 page

1-206

Figure 25. Recommended LED Drive and Application Circuit.

Applications Information

Eliminating Negative IGBT

Gate Drive

To keep the IGBT firmly off, the

HCPL-3150 has a very low

maximum VOL specification of

1.0 V. The HCPL-3150 realizes

this very low VOL by using a

DMOS transistor with 4

Ω

(typical) on resistance in its pull

down circuit. When the

HCPL-3150 is in the low state,

the IGBT gate is shorted to the

emitter by Rg + 4

Ω. Minimizing

Rg and the lead inductance from

the HCPL-3150 to the IGBT gate

and emitter (possibly by

mounting the HCPL-3150 on a

small PC board directly above the

IGBT) can eliminate the need for

negative IGBT gate drive in many

applications as shown in Figure

25. Care should be taken with

such a PC board design to avoid

routing the IGBT collector or

emitter traces close to the HCPL-

3150 input as this can result in

unwanted coupling of transient

signals into the HCPL-3150 and

degrade performance. (If the

IGBT drain must be routed near

the HCPL-3150 input, then the

LED should be reverse-biased

when in the off state, to prevent

the transient signals coupled

from the IGBT drain from turning

on the HCPL-3150.)

Figure 24. CMR Test Circuit and Waveforms.

0.1 µF

VCC = 15

to 30 V

Ω

IF = 7 to 16 mA

–

10 KHz

50% DUTY

CYCLE

500

Ω

3 nF

VOUT

tPHL

tPLH

10%

50%

90%

Figure 23. tPLH, tPHL, tr, and tf Test Circuit and Waveforms.

0.1 µF

VCC = 30 V

–

VCM = 1500 V

5 V

VCM

∆t

0 V

SWITCH AT B: IF = 0 mA

SWITCH AT A: IF = 10 mA

VOL

VOH

∆t

VCM

δV

δt

+ HVDC

3-PHASE

- HVDC

0.1 µF

VCC = 18 V

–

270

Ω

HCPL-3150

+5 V

CONTROL

INPUT

74XXX

OPEN

COLLECTOR

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