ferbo
Junior Member level 2
Hello,
I have designed a dual buck with LTC3892.
40 to 50 v input
vout1: 19v 10 A
vout2: 12v 6 A
my EXTVcc is connected to the second output.
for FETS I am using: BSC0804LSATMA1
For L in 1st channel: PA4344.223NLT
For L in 2nd channel: SRP1770C-330M
I connect the input of 48 volts. I have 4.95 on INTVcc, 9.95 on DRVcc I have 11.5 volt on VOUT2 and 7.5 volt on VOUT1. PGood2 is high and PGood1 is low which shows the programmed output voltages are almost right.
when checked with oscilloscope The channel 2 gate drivers are switching but not the channel 1.
Do you have an idea where is the problem coming from?
Thank you.
I have designed a dual buck with LTC3892.
40 to 50 v input
vout1: 19v 10 A
vout2: 12v 6 A
my EXTVcc is connected to the second output.
for FETS I am using: BSC0804LSATMA1
For L in 1st channel: PA4344.223NLT
For L in 2nd channel: SRP1770C-330M
I connect the input of 48 volts. I have 4.95 on INTVcc, 9.95 on DRVcc I have 11.5 volt on VOUT2 and 7.5 volt on VOUT1. PGood2 is high and PGood1 is low which shows the programmed output voltages are almost right.
when checked with oscilloscope The channel 2 gate drivers are switching but not the channel 1.
Do you have an idea where is the problem coming from?
Thank you.