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Freshman
Freshman
4:14 AM
0
Q: Vin and Vdd MOSFET driver

FreshmanThe user guide of this MOSFET driver states to turn on VDD first (power to the MIC4606), then VIN (the bridge bus voltage). However, the datasheet shows a block diagram of a typical application circuit showing VIN feeding both the h-bridge bus and a switching power supply (MIC28511) which feeds ...

voltage mosfet current motor mosfet-driver
Can someone help to answer this question?
 
 
10 hours later…
Nick Alexeev
Nick Alexeev
2:43 PM
@Freshman I also wonder why that eval board has 4700pF capacitors in parallel with every MOSFET gate. Is that to emulate a much larger MOSFET?
 
W5VO
W5VO
3:22 PM
Probably... 4.7n is 2x the Ciss of the FET they used
 
Nick Alexeev
Nick Alexeev
3:51 PM
Another curious thing in that eval board D3, D4, R6, R7.
What are they for?
[I have a guess.]
 
Nick Alexeev
Nick Alexeev
4:19 PM
I think it's latch-up protection for the high-side gate driver.
 

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