Vicor DC MegaPAC DC-DC Switcher - Manual (Page 9)

Rev. 3/04 Vicor 800-735-6200 Mission Power Solutions (760) 631-6846 (phone) or (760) 631-6972 (fax) Pg. 9
DC MegaPAC Operator’s Manual
General Shutdown /GSD (J10-5)
The GSD control pin on J10-5 allows simultaneous shutdown of all ConverterPAC outputs (see Connector Pin
Identification on page 14). This pin must be pulled down to less than 0.7V, and will sink 10 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.
Input Power OK (J10-18)
This is an active high TTL compatible signal and provides a status indication of the DC input power (see Table 2
and Connector Pin Identification on page 14). It is capable of sinking 20 mA maximum. This signal switches to a
TTL “1” when Vin is within its specified range.
Figure 9. Enable/Disable and General Shutdown
O
PERATING
R
ANGE
V
IN
OK T
RIGGER
Nominal Low High Low Line High Line
Code Vdc Line Line Cut Off Cut Off
0 12 volts 10 volts 20 volts 6V to 10V 20V to 23V
1 24 volts 21 volts 32 volts 16V to 21V 32V to 36V
W 24W volts 18 volts 36 volts 12V to 18V 36V to 41V
2 36 volts 21 volts 56 volts 11V to 21V 56V to 63V
3 48 volts 42 volts 60 volts 34V to 42V 60V to 68V
N 48W volts 36 volts 76 volts 23V to 36V 76V to 86V
4 72 volts 55 volts 100 volts 40V to 55V 100V to 111V*
*Do not apply greater than 100 volts to the input of the DC MegaPAC.
Table 2. Input Voltage Range & Vin OK Limits
J10 INTERFACE CONNECTOR IDENTIFICATION
1 Signal Ground
14 No Connection
2 Signal Ground 15 Signal Ground
3 Overtemp. Warning 16 Vcc +5 volt, 300 mA
4 Analog Temperature 17 Vcc +5 volt, 300 mA
5 General Shutdown 18 Input Power OK
6 No Connection 19 Input Power Fail
7 No Connection 20 No Connection
8 Enable/Disable #8 21 Enable/Disable #7
9 Enable/Disable #6 22 Enable/Disable #5
10 Enable/Disable #4 23 Enable/Disable #3
11 Enable/Disable #2 24 Enable/Disable #1
12 Signal Ground 25 Gate Out Slot #8
13 Gate In Slot #1
Amp 25 pin connector #746862-2
plug for flat ribbon cable. Mates with
housing Amp #747548-2 plus slide
latch or similar.
2 3 4 5 6 7 1 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25
Figure 8. Interface Connector