Other Parts Discussed in Thread: TPS61175-Q1, , LM7171
Hello,
I have some issues with LMG1210RVRR gate driver. Want to use this IC to switch voltages from 15V to 30V at output of
totem pole NMOSFET configuration with bootstrap diode. Because I want to switch to reference of 15V and i don't have
isolated 30 V voltage source I had to connect driver ground to 15 V. I use PWM configuration. 15 V are made from
isolated Murata DC converter. 30 V are made with boost converter TPS61175-Q1. Logical signal at PWM input of
LMG1210 has levels 15 V for logical 0 and 20 V for logical 1.
Problem is that when I solder LMG1210 with all of mentioned components the PCB is short circuited.
I burned like 10 of them already because in first place I thought its my soldering fault.
After I removed the 30V boost converter and powered it from other voltage source short circuit was gone.
But still I couldn't manage to get switching from 15V to 30 V.
My question is: there is possible that LMG1210 is not compatible with TPS61175-Q1? Or I made mistakes
in connections? (schematic below)
About circuit:
15/20V is signal from op amp LM7171 and it works fine without LMG1210
30V is provided from TPS61175-Q1, made gird isolated converter 15V and it works fine without LMG1210
20V is positive signal for EN input
R37,R38 - 150k
C50 - 2.2u
I use this NMOS transistors because I need as low propagation delay from PWM input to HS voltage switch as possible.
This is partial schematic of much advanced circuit.
Thanks for your replies