ACPL-5161 datasheet(3/33 Pages) AVAGO

Part #	ACPL-5161

Description	2.5 Amp Gate Drive Optocoupler with Integrated (VCE) Desaturation Detection and Fault Status Feedback

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Manufacturer	AVAGO [AVAGO TECHNOLOGIES LIMITED]

Direct Link	http://www.avagotech.com

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Product Overview Description

The ACPL-516x is a highly integrated power control de-

vice that incorporates all the necessary components for

a complete, isolated IGBT gate drive circuit with fault

protection and feedback into one rugged, hermetically

sealed package. TTL input logic levels allow direct in-

terface with a microcontroller, and an optically isolated

power output stage drives IGBTs with power ratings of

up to 150 A and 1200 V. A high speed internal optical link

minimizes the propagation delays between the micro-

controller and the IGBT while allowing the two systems

to operate at very large common mode voltage differ-

ences that are common in industrial motor drives and

other power switching applications. An output IC pro-

vides local protection for the IGBT to prevent damage

during overcurrents, and a second optical link provides

a fully isolated fault status feedback signal for the mi-

crocontroller. A built in “watchdog” circuit monitors the

power stage supply voltage to prevent IGBT damage

caused by insufficient gate drive voltages. This integrat-

ed IGBT gate driver is designed to increase the perfor-

mance and reliability of a motor drive without the cost,

size, and complexity of a discrete design.

Two light emitting diodes and two integrated circuits

housed in the same 16-pin ceramic package provide the

input control circuitry, the output power stage, and two

optical channels. The input Buffer IC is designed on a bi-

polar process, while the output Detector IC is manufac-

tured on a high voltage BiCMOS/Power DMOS process.

The forward optical signal path, as indicated by LED1,

transmits the gate control signal. The return optical sig-

nal path, as indicated by LED2, transmits the fault status

feedback signal. Both optical channels are completely

controlled by the input and output ICs respectively,

making the internal isolation boundary transparent to

the microcontroller.

Under normal operation, the input gate control signal di-

rectly controls the IGBT gate through the isolated output

detector IC. LED2 remains off and a fault latch in the in-

put buffer IC is disabled. When an IGBT fault is detected,

the output detector IC immediately begins a “soft” shut-

down sequence, reducing the IGBT current to zero in a

controlled manner to avoid potential IGBT damage from

inductive overvoltages. Simultaneously, this fault status

is transmitted back to the input buffer IC via LED2, where

the fault latch disables the gate control input and the ac-

tive low fault output alerts the microcontroller.

During power-up, the Under Voltage Lockout (UVLO)

feature prevents the application of insufficient gate volt-

age to the IGBT, by forcing the ACPL-516x’s output low.

Once the output is in the high state, the DESAT (VCE)

detection feature of the ACPL-516x provides IGBT pro-

tection. Thus, UVLO and DESAT work in conjunction to

provide constant IGBT protection.

SHIELD

HCPL-316J functional diagram

DESAT

FAULT

UVLO

OUTPUT IC

SHIELD

INPUT IC

RESET

5

FAULT

6

VIN+

1

VIN- 2

VCC1

3

VCC2

13

12

VOUT

11

VEE

9,10

VE

16

DESAT

14

VC

VLED2+

GND1

15

4

VLED1-

7

8

VLED1+

LED2

LED1

D

R

I

V

E

R

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