power of ir2110 with MCU 3.3v

dl324

Joined Mar 30, 2015
13,141
Could I use VDD =5v for IR2110 while using MCU power 3.3v. will it cause issues?
It depends on what VDD is connected to.

If you mean that your MCU is operating at 3.3V and the load is powered from 5V, it will work.

From the datasheet:
clipimage.jpg
 

Alec_t

Joined Sep 17, 2013
12,211
International Rectifier's datasheet says "Logic inputs are compatible with standard CMOS or LSTTL output, down to 3.3V logic."
My interpetation is that for Vdd = 5V the input low/high logic transition occurs around Vdd/2 = 2.5V ± about 5% of Vdd, allowing for the input Schmitt hysteresis. Thus the logic high threshold would be 2.75V, so 3.3V from the MCU in theory would be treated as logic high, but the noise margin would be reduced.
Why can't you use 3.3V as the Vdd?
 
Top