Good Morning Everyone,

Please, I need help with possible solutions to my high side mosfet that gets hot while driving with bd2320.
I have been driving my synchronous buck converter with IR2110 before now and its been working, but I want to move to a more modern IC with reduced BOM thus I selected BD2320. the driver output looks very okay but once i start to drive my mosfet, the high side mosfet gets hot and darws about 500mA on no-load. My gate resistor is 10ohms with 1N4148 anti-parallel diode and I am using a Rgs of 10kohm.

this is the link to the driver datasheet: BD2320EFJ-LA BD2320UEFJ-LA : Power Management (rohm.com)

 

Please post a schematic. What power supply voltages? What switching wave form? More information please. I know you think its in the data sheet but .....

 

Please post a schematic. What power supply voltages? What switching wave form? More information please. I know you think its in the data sheet but .....

Alright,
thanks so much, I will be attaching the schematic and the wave output to this reply. the wave output looks okay from the driver but when i start driving mosfets, the high side mosfet gets hot and draws as high as 200mA-500mA. I have tried to change the bootstrap capacitor value from 0.1uf to 0.68uF, but the effect remains the same. The switching frequency is 100khz and running at a duty cycle of 20%, I must note that varying the duty cycle typically has no effect.

I will be looking forward to your possible suggestions

 

I have tried to change the bootstrap capacitor value from 0.1uf to 0.68uF, but the effect remains the same.

The schematic shows 2.2uF. The data sheet does not say.

The 12V Zeners are not turning on so they are not sucking power.
R1 10k might be using power. Could try 100k.
C113 2uF. What value? 0.1uF is too small. 0.68 is small.
C112 0.1uF probably needs a 1uF in parallel.

Are you certain you turn off one MOSFET before you turn on the next. Probably should have 100nS of "dead time" where no MOSFET is on.

It is good that you are not running 100% on, for the top MOSFET.
What is the supply voltage? 60V?

 

Inadequate dead time between Hin and Lin could well be the problem. The scope traces seem to show no dead time at all.