Hi.....
Can anyone help to calculate the dead band in sg3525 ic. In need 300ns dead band.

 

Did you look in the datasheet?

Discharge time is a function of Rd and Ct. There is a plot in most datasheets for this IC.

Read this Application Note:
http://freedatasheets.com/downloads... Supply And Power Management SG3525 AN250.pdf

 

is discharge time equivalent to dead band between two PWM pulses??
is this formula correct? Tdescharge=3RDCt

 

It doesn't seem to quite work out as 3RdCt.
Even if Rd=0 Ohms and Ct=1nF, discharge time is still 500nS.

As long as Ct is discharging, the clock output is high, blanking the outputs.

See page 7 of the Applications Note I linked to, above, under Oscillator.

 

Thanks for reply..,