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Voltage Regulator-Down (VRD) 10.0 Design Guide Addendum

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VRD Design Guide Addendum
4 Input Voltage and Current
4.1 Input Voltages (EXPECTED)
The main power source for the VRD is 12 volts ±15%. This voltage is supplied by an AC DC
power supply through a cable to the motherboard. For input voltages outside the normal operating
range, the VRD should either operate properly or shut down.
4.2 Load Transient Effects on Input Current
(EXPECTED)
The design of the VRD, which includes the input power delivery filter, must ensure that the
maximum slew rate of the input current does not exceed 1A/µsec, as specified for the ATX12V,
SFX12V or TFX12V (Thin Form Factor with 12V connector) power supply.