1 month ago
SLG46517M PFET Power SwitchPosted by Yuseungho 20 points 3 replies
I'm using the device SLG46517M which has two P-FET power switches. Now, I'm testing the device in emulation mode.
Here I attach my simplified design of the circuit.
The problem is that when the switch is off, the Vout node has too large spike and the spike discharges very slowly.
As a result, when it's off, it reaches almost twice the input voltage (~920mV with 500mV input). The load side now only has a fixed resistor which is 2Mohm just for test.
(I also attach the waveform)
When the switch is on, it outputs properly with the input voltage of 500mV.
As you can see, FSM(ASM) turns on OSC0 in GPAK when the condition is met, and the OSC0 triggers the PFET with 25kHz switching frequency.
I could not figure out what the problem is. I'd really appreciate if you could share your opinions.
|simple circuit architecture||111.7 KB|
|oscilloscope waveform||223.86 KB|