RM23712 TPS
29
3.3 Protection circuits
Protection circuits inside the power supply shall cause only the main output to shutdown (latch off).
If the power supply latches off due to a protection circuit assert, an Input Power cycle OFF for 15sec
or a PSON# cycle HIGH for 1sec shall be able to reset the power supply.
Specific protection circuits shall not latch, but auto recover when the latching reason had been
cleared. This protection circuits will be written in cursive writing and will have a Auto Recover in the
chapter name.
The auxiliary output shall not affected by any protection circuit, unless the auxiliary output itself is
affected.
3.3.1 Over Voltage Protection (OVP
main
& OVP
auxilary
)
All Over Voltage Condition shall be measured internal to the power supply on all outputs (Main and
Auxiliary Output) at the card edge output. The power supply shall shutdown and latch off after an
Over Voltage condition occurs on main outputs, the auxiliary output shall be auto recover after the
OVP had been removed.
The voltages never shall exceed the maximum levels specified in below table when measured
during any fail.
Table 30.Over Voltage Protection requirements
3.3.2 Over Current and Short Circuit Protection (OCP/SCP
main
& OCP/SCP
auxilary
)
The Over Current Condition shall be measured internal to the power supply on all outputs (Main and
Auxiliary Output), and preventing outputs to exceed current limits specified in below table. The
power supply shall shutdown and Auto Recovery after an over current condition on Main and
Auxiliary Outputs, and shall be Auto Recovery when OCP/SCP condition is removed.
The power supply shall alert the system of the OCP/SCP condition via SMBAlert
#
and fail LED
indicator.
The power supply shall not be damaged from repeated power cycling in this condition.
Table 31.Over Current/Short Circuit Protection
Over Current Limit (Iout limit)
≤109%, Continue;
110-120%, for 12S;
121-150%, for 100ms;
≥150%, immediately
3.3.3 Over Temperature Protection (OTP)
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