UG:107
Page 21
Auxiliary V
CC
+5V/0.3A (J10-16, 17)
The V
CC
on J10-16, 17 is an auxiliary 5V regulated power source (see Figure 8 and Connector Pin
Identification on Page 18). It is +5V
DC
±5% with respect to Signal Ground and can supply 300mA
maximum. It is short-circuit proof, but if shorted all outputs will shut down through the Enable / Disable
circuitry. The Auxiliary V
CC
typically powers user circuitry or is used with the Power Good circuitry to
provide a pull-up reference for the outputs of the DC Power Good circuit on a ConverterPAC™. If
used for this purpose, a J10 Signal Ground must also be connected to the J3-1 Signal Ground pin of
the ConverterPAC.
Figure 8
Auxiliary V
CC
78M05
Auxiliary V
CC
16, 17
0.1µF
Signal Ground
J10
1, 2, 12, 15
+5V/300mA
Figure 9
Power Good and V
CC
Signal Ground
2
V
CC
IN
4
J3
10kΩ
2.49kΩ
2N2222
2.49kΩ
1
Power Good
3
Power Good Inverted
ConverterPAC
Power Good (J3-3)
The optional Power Good signal on J3-3 is referenced to Signal Ground on J3-1 and indicates the
status of the output voltage. This signal is asserted a TTL "1" when the output voltage is above 95% of
nominal. It is a TTL "0" when the output voltage is below 85% of nominal.
If the Trim option is also used, the Power Good trip points DO NOT track with the trimmed voltage. It
is possible to trim the output below the fixed setpoints of the Power Good circuit and cause a negative
Power Good signal.
