Part Number: DRV595
Hello
I have an issue when getting the output voltage around 8V with a 5-ohm load
Configuration:
AVCC-PVCC: 12V
Output filter: 47uH with 4.7uF to GND (on both OUTx)
9.4uF between both filter output (load side)
BSP/N to OUTP/N: 0.22uF
master mode, 1Mhz, Gain of 20, IN- connected to a resistor divider (3.3V through 2x 5.1 kohm resistors: mid_point = 1.65V)
when incrementing IN+ to get about 8V on the load, the signal become unstable (pattern repeated at 70Hz)
SYNC clock dissapears (0V) for 9ms and comeback to 100khz for 5ms
IN- : goes to 3.3V and goes down toward normal value when the SYNC clk is back to 100khz
when sync clk re-appears (100khz)
- OUTP jumps 11V (normal because IN- is at 3.3V....)
- OUTN to 0V
- IN- moves from 3.3V to its nominal mid-point (ramping-down)
when sync clk is 0V steady (is the controller in OFF/HiZ mode ...)
- OUTP moves around 6V
- OUTN moves around 6V
- IN- moves to 3.3V
FAULTZ pin stays HI all the time
any ideas that could explain the system reset / idle mode ...?
thanks
Yves
