The uP9512 provides total OCP as shown in Figure 12. A
resistor RIMON is connected from IMON pin to GND. Adding
a capacitor to the IMON pin can adjust the IMON response
time. The sensed current ISUM is mirrored internally and fed
to IMON pin. This current flows through the resistor RIMON
creating voltage across it. As the total load current
increases, the voltage on IMON pin (VIMON) increases
proportionally. When the IMON pin voltage is greater than
2.1V, the total OCP will be triggered. The total OCP level
(2.1V) is usually designed for the voltage regulator that is
operated in full phase condition by hardware setting. The
actual operating phase number is controlled by the PSI
signal or the SMBus Auto Phase setting. When the
operating phase number is decreased, the total OCP level
is decreased as well. The total OCP level is changed per
actual operating phase number. Table 7 shows the
relationship between total OCP ratio per actual operating
phase number and the hardware configuration.
Once the total OCP is triggered. The uP9512 will turn off
both high-side and low-side MOSFETs of all channels. The
total OCP function is a latch-off function and only EN restart
or 5VCC re-POR can release the latch.

You can observe it on the scope

Привет cxav,

Bit 6 means OCP - Total overcurrent protection. It happens when the VRM can't start due to the extensive current draw. For example GPU core consumes too much current. What is the resistance? Please post all resistances of all voltage rails.

Please read the description of pin 25. If this circuit is OK it means that you have a real overcurrent. You can observe it on the scope, you will have several short pulses on the inductors and they stop a millisecond later. This initial sampling is responsible for initial sensing.

Inject 0.8V and observe on the thermal camera, maybe it is capacitor only.

Also read page 12 of this PDF: Channel Current Limit (CH_OC)..... Total Output Current Protection.....

If it is Total protection bit it means that you have catastrophic core failure. I had this many times, the last one a week ago. I removed GPU and Vcore came back. In general nothing new haha But try to inject 0.8V to inductors and use thermal camera.