ACPL-332J 查看數據表（PDF） - Avago Technologies

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ACPL-332J

2.5 Amp Output Current IGBT Gate Driver Optocoupler with Integrated (VCE) Desaturation Detection, UVLO Fault Status Feedback and Active Miller Clamping

Avago Technologies 

+_ 0.1µF

RF

CF

R

+_

1 VS

2 VCC1

3 FAULT

4 VS

5 CATHODE

6 ANODE

7 ANODE

8 CATHODE

VE 16

VLED 15

0.1µF 0.1µF

DESAT 14

CBLANK

100 Ω

DDESAT

VCC2 13

VEE 12

VOUT 11

VCLAMP 10

VEE 9

RG

+_

Q1

RPULL-DOWN

Q2

Figure 36. Recommended application circuit (Single Supply) with desaturation detection and active Miller Clamp

+ HVDC

+

VCE

-

3-PHASE

AC

+

VCE

-

- HVDC

Description of Operation

Normal Operation

During normal operation, VOUT of the ACPL-332J is con-

trolled by input LED current IF (pins 5, 6, 7 and 8), with

the IGBT collector-to-emitter voltage being monitored

through DDESAT. The FAULT output is high. See Figure 37.

Fault Condition

The DESAT pin monitors the IGBT Vce voltage. When the

voltage on the DESAT pin exceeds 6.5 V while the IGBT is

on, VOUT is slowly brought low in order to “softly” turn-off

the IGBT and prevent large di/dt induced voltages. Also

activated is an internal feedback channel which brings

the FAULT output low for the purpose of notifying the

micro-controller of the fault condition.

Fault Reset

Once fault is detected, the output will be muted for 5 µs

(minimum). All input LED signals will be ignored during

the mute period to allow the driver to completely soft

shut-down the IGBT. The fault mechanism can be reset by

the next LED turn-on after the 5us (minimum) mute time.

See Figure 37.

IF

tDESAT(LOW)

6.5V

VDESAT

50%

VOUT

tBLANK

tDESAT(10%)

90%

tDESAT(90%)

10%

FAULT

50%

tDESAT(FAULT)

tDESAT(MUTE))

Figure 37. Fault Timing diagram

Reset done

during the

next LED

turn-on

tRESET(FAULT)

50%

20

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