Intel TFX12V Electrical, AC Input, Input Over Current Protection, Inrush Current Limiting, Unit

TFX12V Power Supply Design Guide

Thin Form Factor with 12 V Connector

Version 2.0

2 Electrical

The following electrical requirements must be met over the environmental ranges as defined in Section 5 (unless otherwise noted).

2.1 AC Input

Table 1, lists AC input voltage and frequency requirements for continuous operation. The power supply shall be capable of supplying full-rated output power over two input voltage ranges rated 100-127 VAC and 200- 240 VAC rms nominal. The correct input range for use in a given environment may be either switch- selectable or auto-ranging. The power supply shall automatically recover from AC power loss. The power supply must be able to start up under peak loading at 90 VAC.

Table 1. AC Input Line Requirements

Parameter		Minimum	Nominal*	Maximum
Vin	(115 VAC)	90	115	135
Vin	(230 VAC)	180	230	265
Vin	Frequency	47	--	63

*Note: Nominal voltages for test purposes are considered to be within ±1.0 V of nominal.

Unit

VAC rms

VAC rms

Hz

2.1.1Input Over Current Protection

The power supply shall incorporate primary fusing for input over current protection to prevent damage to the power supply and meet product safety requirements. Fuses should be slow-blow–type or equivalent to prevent nuisance trips.1

2.1.2Inrush Current Limiting

Maximum inrush current from power-on (with power-on at any point on the AC sine) and including, but not limited to, three line cycles, shall be limited to a level below the surge rating of the input line cord, AC switch if present, bridge rectifier, fuse, and EMI filter components. Repetitive ON/OFF cycling of the AC input voltage should not damage the power supply or cause the input fuse to blow.

2.1.3Input Under Voltage

The power supply shall contain protection circuitry such that the application of an input voltage below the minimum specified in Section 2.1, Table 1, shall not cause damage to the power supply.

1For Denmark and Switzerland international safety requirements, if the internal over current protective devices exceed 8A for Denmark and 10A for Switzerland, then the power supply must pass international safety testing to EN 60950 using a maximum 16A over-current protected branch circuit, and this 16A (time delay fuse) branch circuit protector must not open during power supply abnormal operation (output short circuit and component fault) testing.

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