Hello,
I've designed a LM5175 buck-boost circuit ,19-28V input,24V/5A output.
while I test the circuit,found the MOS are very hot even unloaded .
The output voltage is OK.But the input current looks weird,test results as below:(1.buck: input 27.5V/1A ,OUTPUT 24V/160mA 2.boost:input 19V/2A,output 24V/160mA.)
The load mode setting is C R mode-140 Ohm.Please advise what's wrong with this circuit .wave form as below: