I'm trying to control a 12V DC brushed motor (4A with load ) with an H-bridge , TLE5205 datasheet ( 5A , 6A peak , 40V , integrated free-Wheeling diodes ), but when using a 3S1P lipo battery ( 11.1V , 3.5Ah , 25C ), on motor start-up , a voltage drop occour and the h-bridge automatically goes in Undervoltage lockout ( Vs < 6 Volts ), switching off the motor
I tried both single 4700uF capacitor and two 4700uF in parallel
Using a 11V ni-mh battery everything works fine. So I guess it's related only on lipo batteries.
If the motor is connected directly to lipo battery , it runs without any problem.
How could I smooth voltage drop , and avoid the h-bridge to go in UVLO ?
I know the h-bridge is going in UVLO because I compared outputs ( which are in tristate ) and Vef with the error table in datasheet : IN1 = IN2 = 0V , OUT1 = Vs/2 , OUT2 = Vs/2 , Vef = 0 ( Error flag circuit is not shown in the picture above )