I designed a battery charger for 2 cell Li-po with BQ2057WTS as you can see "bq2057wts" picture attached. I have to short circuit protection and reverse connection protection for battery connection. I added a schottky diode as you can see "bq2057wts revised" picture attached but it didn't solve reverse connection. When I connected battery reverse, the IC burned.
I thinked to use P or N channel mosfet but I didn't realise that. Could you suggest a solution for this project ?
1. You mean, I have to connect diode after BAT pin (IC pin 2) connection. If yes, it influences the battery voltage measurement.
2. Yes, Vcc is isolated from mains.
But then thats the only way how you can prevent opposite polarity across the IC. As far as the voltage drop is concerned, you may want to use a synchronous MOSFET rectifier. It does not give a forward voltage drop, however it will have an on state resistance ranging from 10 mOhm to 50 mOhm (typical)
But then thats the only way how you can prevent opposite polarity across the IC. As far as the voltage drop is concerned, you may want to use a synchronous MOSFET rectifier. It does not give a forward voltage drop, however it will have an on state resistance ranging from 10 mOhm to 50 mOhm (typical)