Specifications

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 9). For DualQPACs, 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 0.7V with respect to Signal Ground to dis-
able the outputs. They will sink 10 mA maximum. These pins should be open circuited or allowed to exceed 4.5V
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.
Enable/Disable control of 2nd Generation Module Arrays
When using the Enable/Disable function on an output that consists of two or more 2nd Gen modules, it is neces-
sary to connect the E/D pins of the corresponding module locations together such that both modules are command-
ed to turn ON or OFF simultaneously.
Example: Slots 2, 4 and 6 have been configured as a single output parallel array (see Fig. 6)
In order to disable the 48V output, E/D 2, E/D 4 and E/D 6 should be shorted together as shown in Fig.6. With
E/Ds connected together, a single switch can then be used to remotely enable and disable the output.
**Note: For single output power supply configurations, the simplest method of remotely enabling and disabling
the output is to use the General Shutdown (GSD) function.
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 9). This pin must be pulled down to less than 0.7V, and will sink 13 mA maximum to shut
down all outputs. The GSD pin should be open circuited or allowed to exceed 4.5V when not in use, or when the
outputs are to be enabled. Do not apply more than 6V to this input at any time. Normal open circuit voltage is 1.5
to 3V with respect to Signal Ground. If driven from an electromechanical switch or relay, a capacitor should be
connected to eliminate the effects of switch bounce.
Pg 14 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474 Rev. 6/2004
PFC MegaPAC-EL/PFC MegaPAC-High Power Low Noise
PFC MegaPAC-EL
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
Figure 5: Enable/Disable and General Shutdown
PFL48V/12.5AN
PFL48V/12.5AJS1
PFL48V/12.5AJS1
Slot# 1
Slot# 2
Slot# 3
Slot# 4
Slot# 5
Slot# 6
Slot# 7
Slot# 8
J1
J10
2
4
6
10
123
Power Factor Corrected
MegaPAC
L5V/40A
L3.3V/40A
Figure 6. Enable/Disable Control of 2nd Gen Arrays