Intel TFX12V Short-circuit Protection, No-load Operation, Over Current Protection, Output Bypass

Table 15. Over Voltage Protection

Output	Minimum
+12 V1DC	13.4
+12 V2DC	13.4
+5 VDC	5.74
+3.3 VDC	3.76

Nominal

15.0

15.0

6.3

4.2

TFX12V Power Supply Design Guide Thin Form Factor with 12-V Connector Version 2.0

Maximum	Unit
15.6	Volts
15.6	Volts
7.0	Volts
4.3	Volts

2.4.2Short-circuit Protection

An output short circuit is defined as any output impedance of less than 0.1 ohms. The power supply shall shut down and latch off for shorting the +3.3 VDC, +5 VDC, or +12 VDC rails to return or any other rail. Shorts between main output rails and +5 VSB shall not cause any damage to the power supply. The power supply shall either shut down and latch off or fold back for shorting the negative rails. +5 VSB must be capable of being shorted indefinitely, but when the short is removed, the power supply shall recover automatically or by cycling PS_ON#. The power supply shall be capable of withstanding a continuous short circuit to the output without damage or overstress to the unit (for example, to components, PCB traces, and connectors) under the input conditions specified in Section 3.1.

2.4.3No-load Operation

No damage or hazardous condition should occur with all the DC output connectors disconnected from the load. The power supply may latch into the shutdown state.

2.4.4Over Current Protection

Overload currents applied to each tested output rail cause the output to trip before reaching or exceeding 240 VA. For testing purposes, the overloaded currents should be ramped at a minimum rate of 10 A/s starting from full load.

2.4.5Over-temperature Protection

As an option, the power supply may include an over-temperature protection sensor, which can trip and shut down the power supply at a preset temperature point. Such an overheated condition is typically the result of internal current overloading or a cooling fan failure. If the protection circuit is non-latching, then it should have hysteresis built in to avoid intermittent tripping.

2.4.6Output Bypass

The output return may be connected to the power supply chassis, and will be connected to the system chassis by the system components.