The problem was simpulating with LTspice: I have this irl3103s.spi from the IR website. I am trying to use the MOSFET hi-side as a sync-rectifier(backwards).... I am driving with IRL2110 (2Amps,15V). I sill get 200 Amp spikes that look like dv/dt turn on(when the lower FET(IRFZ44) switches on). I tried adding capacitor from gate to source. stopped(unsuccessfully) at around 100nF. looked at the .spi file. They have a bunch of components connected to the 0 node(diodes, behavoiral sources...). Is that ok? I suspect that only works in lo-side applications?
posting the spi..
8 Drain- Node 2 -> Gate
- Node 3 -> Source M1 9 7 8 8 MM L=100u W=100u
- Default values used in MM:
- The voltage-dependent capacitances are
- not included. Other default values are:
- RS=0 RD=0 LD=0 CBD=0 CBS=0 CGBO=0 .MODEL MM NMOS LEVEL=1 IS=1e-32
- Default values used in MD1:
- RS=0 EG=1.11 XTI=3.0 TT=0
- BV=infinite IBV=1mA .MODEL MD1 D IS=1e-32 N=50
- Default values used in MD2:
- EG=1.11 XTI=3.0 TT=0 CJO=0
- BV=infinite IBV=1mA .MODEL MD2 D IS=1e-10 N=0.4 RS=3e-06 RL 5 10 1 FI2 7 9 VFI2 -1 VFI2 4 0 0 EV16 10 0 9 7 1 CAP 11 10 4.07694e-09 FI1 7 9 VFI1 -1 VFI1 11 6 0 RCAP 6 10 1 D4 0 6 MD3
- Default values used in MD3:
- EG=1.11 XTI=3.0 TT=0 CJO=0
- RS=0 BV=infinite IBV=1mA .MODEL MD3 D IS=1e-10 N=0.4 .ENDS