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L6387E maximum gate drive current?

GAnde.1
Associate II

0693W000008ydqSQAQ.gifHi,

We are using a L6387E to drive two half-bridge MOSFETS of type STW20N65M5 or equivalent in a off-line DC/DC converter.

The circuitry in between consists of a 10 Ohm resistor, and a diode+3.3 ohm resistor in discharge-direction, in parallel respectively.

Supply voltage is 12V, half-bridge voltage is 325V.

Switching frequency is 50kHz.

We noticed that at high environment temperature of 45°C the 3.3 resistor together with the gate-driver failed. The datasheet tells 400 mA source and 650 mA sink current, although the IC might encounter around 12V/10ohm and 12V/3 ohm -> 4 Amps of peak current.

Is the driver current capability in the datasheet refering to peak current or average continuous current?

Thanks!

1 REPLY 1
GAnde.1
Associate II

Any Idea on this?