AN2002

Using the Demoboard for the TD350 Advanced IGBT Driver

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Application example no. 1

This first application example demonstrates the typical configuration in which TD350 can be used in low

and medium power applications. In this configuration, the TD350 is able to drive IGBTs with current

ratings up to about 50A. The schematic showing how to connect the demoboard to the optocoupler,

power supply and IGBT module is presented on Figure 5. The demoboard doesn’t require any

modification in order to be used in this configuration. However, it should be noted that C5 and C7

(decoupling capacitors for negative supply) are not needed in this example and they could be removed to

optimize application cost and PCB space.

The main characteristics of this example are:

avoid mistriggering of the IGBT at turn-off

pin to the IGBT gate with R9=0R resistor

1.5µs to reduce over-voltage stress on the IGBT in case of over-current event

implement the desaturation protection, see Section 2.5.

Figure 5: TD350 demoboard used in basic application

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

47pF*

(*): optional parts