Other Parts Discussed in Thread: LM5069
Tool/software:
I have an issue with the LM74502EVM where in certain scenarios the gate voltage keeps resetting indefinitely.
Vin: 24V
Load: 124ohm resistive
Toggle switch inline with hot power supply to simulate hot swap
R9 swapped with 4.64k to set OVLO to ~28V
Ch 1: Vin
Ch 2: Vgate
Ch 3: Vov
The issue is still present sometimes without testing hot swap (using bench power supply ON button, ~4ms rise time). The issue is also present with a load that is representative of our use case (1500uF, ~0.2A steady state load). The issue is not present with no load connected. The device does seem to go stable when input voltage is around 16V or lower, although with a few cycles of resetting.
Each time the gate resets, there is a high frequency ringing on Vin, GATE, OV, and other pins. I have tried various modifications with no luck: disconnecting OV, adding bypass caps (100nF) to OV, EN, VS, adding RC filter to VS (R2 = 10k, C7 = 1uF), changing C4 value, removing soft-start cap (C1), adding 15ohm gate series resistor, etc.
Ch 1: Vin
Ch 2: Vg
Ch 3: Vcap
Ch 4: Vout
Any ideas would be greatly appreciated. I have also been looking at the LM5069, would this device be better suited for a 24V hot-swap application?
