Technical Product Specification

Intel® Server System R2000IP Product Family TPS Power Subsystem

Revision 1.1

Figure 21. Turn On/Off Timing Diagram (Power Supply Signals)

3.6.17 Residual Voltage Immunity in Standby Mode

The PS supply should be immune to any residual voltage placed on 12V output (typically a

leakage voltage through the system from standby output) up to 500mV. This residual voltage

shall not have any adverse effects on the PS, including: additional power dissipation or over-

stressing/over-heating any internal components or adversely affect the turn-on performance (no

protection circuits tripping during turn on).

While in Stand-by mode, at no load condition, the residual voltage on 12V output shall not

exceed 100mV.

3.7 Protection Circuits

Protection circuits inside the power supply shall cause only the power supply’s main outputs to

shutdown. If the power supply latches off due to a protection circuit tripping, an AC cycle OFF

for 15sec and a PSON

cycle HIGH for 1sec shall be able to reset the power supply.

3.7.1 Over-current Protection (OCP)

The power supply shall have current limit to prevent the +12V, 5Vsb outputs from exceeding the

values shown below. If the current limits are exceeded the power supply shall shutdown and

latch off. The latch will be cleared by toggling the PSON

signal or by an AC power interruption.

The power supply shall not be damaged from repeated power cycling in this condition. 5Vsb

AC Input

Vout

PWOK

5VSB

PSON

sb_on_delay

AC_on_delay

pwok_on

vout_holdup

pwok_holdup

pson_on_delay

sb_on_delay

pwok_on

pwok_off

pson_pwok

pwok_low

sb_vout

AC turn on/off cycle

PSON turn on/off cycle

5VSB_holdup