STGAP1AS mosfet driver paralleled mosfets active miller clamp.

[HGüne.1]

Hello.

How can i use active miller clamp function of STGAP1AS mosfet driver for paralleled mosfets?

[Cristiana SCARAMEL]

Hello @Hilmi Güney​ welcome to the ST Community.

You can use the Miller Clamp function connecting the CLAMP pin to the connection point of the MOSFETs gate (refer to below picture).

The CLAMP pin monitors the voltage at the gate connection when the MOSFET is off.

The internal CLAMP switch is activated when the voltage goes below the voltage threshold VCLAMPth, thus creating a low impedance path between the MOSFETs gate and the VL pin.

[HGüne.1]

Hello @Cristiana SCARAMEL​ 

I am wondering how can i use active miller clamp function 2 paralled mosfets?

[Cristiana SCARAMEL]

Hello @Hilmi Güney​ ,

I edited my previous post because I forgot the picture :grinning_face_with_sweat:

I suggest to modify the gate resistors connection to reduce the current unbalance (see picture below).

Any variation, not so much of resistance value, but of gate paths (parasitic inductance and resistance of the traces) will affect current balance.

Each gate path trace must be kept as short as possible, moreover a symmetrical length traces are suggested.

With this configuration you can use two different gate resistors for turn and turn off.

[Cristiana SCARAMEL]

Hello @Hilmi Güney​,

it is more clear to you how to use the active miller clamp function in your application?

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