Using the Demoboard for the TD350 Advanced IGBT Driver

AN2002

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4

Application example no.2

This second application example shows the typical configuration in which the TD350 can be used in high

power applications. With the use of an additional buffer, the TD350 can drive IGBTs with a current rating

above 100A. The schematic in Figure 6 shows how to connect the demoboard with the optocoupler and

the power supplies on the input side, and with the IGBT module and the gate buffer circuit on the output

side.

The demoboard needs a few modifications with respect to its original configuration to be used as shown

in this example:

1) The R9 strap should be removed.

2) The resistors R6 and R7 should be replaced by short-circuits.

The main characteristics of this example are:

connected to a discrete buffer stage made of two complementary bipolar transistors,

feature a secondary gate discharge,

Figure 6: TD350 demoboard used in high power applications

7

2

4

5

1

3

6

8

In1

Lvoff

VL

Gnd

Fault

Gnd

VH

In2

2

4

1

3

Desat

Out

Gnd

Clamp

TD350 demoboard

16V

10V

47pF*

(*): optional parts

VH

T1

T2

T3

VL

VL

1kV

diode