Vicor Mini MegaPAC AC-DC Switcher - Manual (Page 15)

UG:110 vicorpower.com Applications Engineering: 800 927.9474 Page 15
Interface Connections (Cont.)
Signal Ground (J10-10)
Signal Ground (see Figure 4 and Connector Pin Identification on Page 9) is an isolated
ground reference for all J10 interfacing signals, and can be used for ConverterPAC
output status signals such as Power Good. This is not the same as Earth Ground on input
power connector J9.
Enable/Disable (J10-1 to J10-5)
The Enable/Disable control pins allow ConverterPAC outputs to be sequenced either
on or off. J10-1 through J10-5 are the control pins for output positions 1 through 5,
respectively (see Figure 5 and Connector Pin Identification above). For DualPACs,
both outputs are sequenced. In parallel arrays, only the driver ConverterPAC need be
controlled. The Enable/Disable pins should be pulled low to less than 0.7 V with respect
to Signal Ground to disable the outputs. They will sink 10 mA maximum. These pins
should be open circuited or allowed to exceed 4.5 V when enabled. Do not apply more
than 6 V to these inputs at any time.
General Shutdown/GSD (J10-12)
The GSD control pin on J10-12 allows simultaneous shutdown of all ConverterPAC
outputs (see Connector Pin Identification on Page 12). This pin must be pulled down
to less than 0.7 V, and will sink 10 mA maximum to shut down all outputs. The GSD
pin should be open circuited or allowed to exceed 4.5 V when not in use, or when the
outputs are to be enabled. Do not apply more than 6 V to this input at any time. Normal
open circuit voltage is 1.5 to 3 V with respect to Signal Ground.
Figure 4.
Interface Connector (J10)
NC
NC
NC
E/D-5
E/D-4
E/D-3
E/D-2
E/D-1
J10-8
J10-7
J10-6
J10-5
J10-4
J10-3
J10-2
J10-1
J10 INTERFACE PIN OUT
GEN SHUTDOWN
AC POWER OK
SIGNAL GROUND
Vcc +5V, 0.3A
J10-12
J10-11
J10-10
J10-9
1 2 3 4 5 6
7 8 9 10 11 12
Mini MegaPAC
1
10
12
Signal Ground
General Shutdown
Enable/Disable Output 1
J10
1
0
TTL "1" (OFF)
TTL "0" (ON)
A TTL "1" applied to the base of the transistor turns
output OFF. Pin 1 (or Pin 12 for GSD) is pulled Low
with respect to Signal Ground. 9
Vcc
Enable/Disable Control
Figure 5.
Enable/Disable and
General Shutdown