Hi,
My original designing use 5V optocoupler to finish the isolation function, optocoupler output drive the MMBF170L mosfet at ON or OFF state with very low frequency.
Now, I feeling ADuM1200 chip also can finish the same function, the better thing is this way need less current than optocoupler.
Due to I never use ADuM1200 chip to drive the MOSFET, I have a little bit worry about whether it can work well.
Could you helps to take a look it, whether it is a normal usage without risk.
Thanks.
Hi Weidong:
The schematic is OK. Only one suggestion to place R84 directly between G, S of Q8.
As Dave has suggested, please pay attention to the fai-safe logic status when choosing digital isolator. it…
Hi Weidong:
When VDD2 is below UVLO point, the output is high impedance. By adding 10kohm pull down resistor, we can get a logic L output.
Chris
Hi,
how fast do you want to turn on/off Q6?
ADuM1200's output impedance is around 60-70 ohm.
if 10K ohm is exactly value for R113 in your application, ADuM1200 can turn on Q6 well.
Chris
