Broadcom ACPL-32JT 사용자 설명서 - 페이지 3

{카테고리_이름} Broadcom ACPL-32JT에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Broadcom ACPL-32JT 16 페이지. Evaluation driver board for fuji m652 6-in-1 igbt

ACPL-32JT, ACPL-C87AT

The IGBT collector voltage is sensed by the ACPL-32JT gate

drivers through the Desat pin. When desaturation events are

detected, ACPL-32JT applies a soft shutdown to the IGBT gate

to prevent damage. A PNP buffer transistor is used to

customize the shutdown process. The shutdown strength is

controlled by Rssd and Cssd.

Desat Blanking

Figure 4 Desat Blanking

The total blanking time is calculated in terms of internal

blanking time tDESAT(BLANKING) (0.6 μs typ), external

capacitance CBLANK (330 pF), FAULT threshold voltage VDESAT

(7V typ), and DESAT charge current ICHG (0.9 mA typ) as

follows:

tBLANK = tDESAT(BLANKING) + (CBLANK × VDESAT/ICHG)

= 0.6 μs + (330 pF × 7V/0.9 mA)

~ 3.2 μs

Active Clamp

Figure 5 Active Clamp

A Transient Voltage Suppressor (TVS) rated at 510V is placed

between the Gate and Collector of the IGBT to provide active

clamp protection. Vce of the IGBT is clamped and protected by

the TVS.

DC/DC Converter

Figure 6 DC/DC Converter

Each ACPL-32JT Gate Driver integrates a DC/DC converter that

provides distributed power to the secondary side.

For DC12 = 8V to 18V, this circuit nominally supports a

secondary-side load of up to 60 mA (including Icc2 of

ACPL-32JT) at the regulated VCC2 voltage.

Figure 7 Compensation Network

The compensation network is referenced to a nominal

transformer of Lp = 60 μH, Ls = 260 μH.

Broadcom

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User Guide