1

16

2

3

4

5

6

7

8

15

14

13

12

11

10

9

DESAT

VEE2

VCC2

GND2

VEE2

VCC1

GND1

RDY

IN-

IN+

GND1

FLT

RST

NC

OUT

CLAMP

3

ISO5451-Q1

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SLLSEQ3A – SEPTEMBER 2016 – REVISED DECEMBER 2016

Product Folder Links: ISO5451-Q1

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5 Description (continued)

When desaturation is active, a fault signal is sent across the isolation barrier, pulling the FLT output at the input

side low and blocking the isolator input. The FLT output condition is latched and can be reset through a low-

active pulse at the RST input.

When the IGBT is turned off during normal operation with bipolar output supply, the output is hard clamp to VEE2.

If the output supply is unipolar, an active Miller clamp can be used, allowing Miller current to sink across a low

impedance path, preventing IGBT to be dynamically turned on during high voltage transient conditions.

The readiness for the gate driver to be operated is under the control of two undervoltage-lockout circuits

monitoring the input side and output side supplies. If either side has insufficient supply the RDY output goes low,

otherwise this output is high.

The ISO5451-Q1 is available in a 16-pin SOIC package. Device operation is specified over a temperature range

from –40°C to +125°C ambient.

6 Pin Configuration and Function

DW Package

16-Pin SOIC

Top View

Pin Functions

PIN

I/O

DESCRIPTION

NAME

NO.

CLAMP

7

O

Miller clamp output

DESAT

2

I

Desaturation voltage input

FLT

13

O

Fault output, low-active during DESAT condition

GND1

9, 16

—

Input ground

GND2

3

—

Gate drive common. Connect to IGBT emitter

IN+

10

I

Non-inverting gate drive voltage control input

IN–

11

I

Inverting gate drive voltage control input

NC

4

—

Not connected

OUT

6

O

Gate drive voltage output

RDY

12

O

Power-good output, active high when both supplies are good

RST

14

I

Reset input, apply a low pulse to reset fault latch

VCC1

15

—

Positive input supply (3 V to 5.5 V)

VCC2

5

—

Most positive output supply potential

VEE2

1, 8

—

Output negative supply. Connect to GND2 for unipolar-supply application