1

NŸ

DESAT

GND2

OUTH

15V

1F

ISO5452

CLAMP

OUTL

3

1,8

5

4

6

2

7

15

9.16

11

10

12

13

14

IN-

IN+

RDY

10k

10k

0.1F

GND1

2.25V...5V

10R

220

pF

RST

FLT

1

NŸ

DESAT

GND2

OUTH

15V

1F

ISO5452

220

pF

CLAMP

OUTL

3

1,8

5

4

6

2

7

15V

15

9.16

11

10

12

13

14

IN-

IN+

RDY

10k

10k

0.1F

GND1

2.25V...5V

10R

1F

RST

FLT

ISO5452

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SLLSEQ4A – AUGUST 2015 – REVISED SEPTEMBER 2015

Typical Applications (continued)

10.2.1 Design Requirements

Unlike optocoupler based gate drivers which need external current drivers and biasing circuitry to provide the

input control signals, the input control to the ISO5452 is CMOS and can be directly driven by the microcontroller.

Other design requirements include decoupling capacitors on the input and output supplies, a pullup resistor on

the common drain FLT output signal, and a high-voltage protection diode between the IGBT collector and the

DESAT input. Further details are explained in the subsequent sections. Table 2 shows the allowed range for

Input and Output supply voltage, and the typical current output available from the gate-driver.

Table 2. Design Parameters

PARAMETER

VALUE

Input supply voltage

2.25-V to 5.5-V

15-V to 30-V

15-V to 30-V

0-V to 15-V

Output current

2.5-A

10.2.2 Detailed Design Procedure

10.2.2.1 Recommended ISO5452 Application Circuit

The ISO5452 has both, inverting and non-inverting gate control inputs, an active low reset input, and an open

drain fault output suitable for wired-OR applications. The recommended application circuit in Figure 48 illustrates

a typical gate driver implementation with Unipolar Output Supply and Figure 49 illustrates a typical gate driver

implementation with Bipolar Output Supply using the ISO5452.

A 0.1-

reliable operation. The 220 pF blanking capacitor disables DESAT detection during the off-to-on transition of the

gate resistor limits the gate charge current and indirectly controls the IGBT collector voltage rise and fall times.

The open-drain FLT output and RDY output has a passive 10-k

Ω pull-up resistor. In this application, the IGBT

gate driver is disabled when a fault is detected and will not resume switching until the micro-controller applies a

reset signal.

Figure 48. Unipolar Output Supply

Figure 49. Bipolar Output Supply

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Product Folder Links: ISO5452