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

UG:106 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 12) is an
isolated ground used as a 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 J10-8)
The Enable/Disable control pins allow ConverterPAC outputs to be sequenced either
on or off. J10-1 through J10-8 are the control pins for output positions 1 through
8, respectively (see Figure 5 and Connector Pin Identification on Page 12). For
DualPACs and FlexPACs, all 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 6V to these inputs at any time. If driven from an
electromechanical switch or relay, a capacitor should be connected to eliminate the
effects of switch bounce.
Figure 4.
Interface Connector (J10)
12 11 10 9 8 7
6 5 4 3 2 1
J10
J10-9
J10-10
J10-11
J10-12
Vcc +5V, 0.3A
SIGNAL GROUND
AC POWER OK
GEN SHUTDOWN
J10-1
J10-2
J10-3
J10-4
J10-5
J10-6 J10-7
J10-8 E/D-1
E/D-2
E/D-3
E/D-4
E/D-5
E/D-6 E/D-7
E/D-8
Figure 5.
Enable/Disable and
General Shutdown
Autoranging 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
End of Life - Not Recommended for New Designs