1 GND
2 REMOTE_ON
3 BAT VS
4 BAT EN
5 Vaux
CN7 EXT Board 5267-06A
6 5Vstd
1 24V External OUT
CN10 EXT Board 5267-02A
2 GND
4.7.5 Output Voltage Adjustment Range
Each output voltage has an adjustment range of the nominal Vset voltage as
specified in the table. The adjustments are clearly labeled and accessible from the
top of the Power Supply. Turning adjustment potentiometers clockwise increases
the absolute value of output voltages.
4.7.6 +5VSB Standby Supply Rail
+5VSB is a standby supply output that is active whenever the AC power is present.
It provides a power source for the processor standby circuits that must remain
operational when the other main DC output rails are in a disabled state. The 5VSB
output is capable of delivering up to 0.5A continuously with the fan not operating.
4.7.7 Control
The following control signals are required.
4.7.7.1 Output Enable OUTPUT-EN/ (active low)
This is an active low signal which comes from the processor board that
turns on (enables) all of the power supply DC outputs.
4.7.7.2 Line Frequency Synchronization Output Signal (LFS)
The LFS signal is safety-isolated from the primary circuits of the power
supply. The LFS signal is a digital signal (TTL levels) that toggles at
each zero-crossing of the AC line input.
4.7.7.3 PWR_OK signal
PWR_OK is a “power good” signal. It is asserted high by the power
supply a minimum of 100ms after all Secondary Outputs are above the
minimum voltage as specified by the lower limit of the regulation band
and the AC line is present. The PWR_OK rise time is <= 10ms. In the
case of AC line disconnection or drop-out, the PWR_OK signal goes low
when at least one of Secondary Outputs drop out of regulation.
Theory of Operation 4-21
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