Electrical – IR2101 cross-conduction


The IR2101 is an high and low driver typically used to drive MOSFET half bridges.

On this blog, it is said (IR2110 is almost the same as IT2101):

"IR2110 can't be used to drive both high-side and low-side MOSFETs simultaneously"

The only indication about that specific point I can find in the datasheet is the sentence:

"The output drivers feature a high pulse current buffer stage designed
for minimum driver cross-conduction"

However the functional block diagram doesn't mention any exclusion of the HIN+LIN case, and they also show examples where HIN and LIN are switching from low to high simultaneously.

So, do you think I can cross-conduct my half-bridge by setting both pins to high with this driver?


Best Answer

I think you can count on the matched output delay times within 10 ns for the IR2101 using the test circuit and test method in the datasheet.

Putting both inputs high would pull both outputs high , which is the same as shorting out your load to the same supply voltage. ( i.e. Brake )

External drivers can then be modified to control the Dead Time to prevent shootthru with L/R decay times using non-linear Diode/R ratios with Ciss.

Measurement Thresholds ( Note the different threshold levels) enter image description here

The deadtime can be improved with the (R1//D3,R2//D2 ;)) Diode shunted 10 Ohm R to turn Off faster than On.. The diode has low resistance (~1 ohm)during rapid negative edge Vgs transitions.

enter image description here