fail of MasterGan4

ZHT · ‎2025-05-04

I find the wavefrom of SW terminal(the connection of the bridge) is wrong. The frequency is consistent with the input signal but the Amplitude is 3V3. But there's no 3V3 power supply. It should have been the VIN I offer. And it's exactly a square wave. What may cause this case?

Peter BENSCH · ‎2025-05-04

Welcome @ZHT, to the community!

Please forgive my lack of understanding, but the MASTERGAN4 has no terminal SW.

Could it be that you mean a ready-made board?
Is this board from STMicroelectronics, e.g. an evaluation board?

Regards
/Peter

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ZHT · ‎2025-05-06

I'm sorry for the unclear description. Actually, I bought a chip MasterGan4TR and degisn the circuit with the reference of your evaluation board. Here's the specific circuit. The VIN input is 12V. I'm just confused about why it works abnormally like what I described before.

Peter BENSCH · ‎2025-05-07

Well, the MASTERGAN4 is a half-bridge driver which usually handles up to 600V, but you want to operate use it with VIN at only 12V, right?

Please check whether VBO UVLO protection is already active.
Please also check at GH, where the gate of the HS GaN is led out, whether the drive level is sufficiently high and reaches at least 5V with respect to VOUT.

Regards
/Peter

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