Vicor Westcor PFC Mini Power Factor Corrected AC-DC Switcher - Manual (Page 17)

UG:115 vicorpower.com Applications Engineering: 800 927.9474 Page 17
Enable/Disable Control of Maxi, Mini, Micro Series Module Arrays
When using the Enable/Disable function on an output that consists of two or more
Maxi/Mini series modules, it is necessary to connect the Enable/Disable pins of the
corresponding module locations together such that both modules are commanded to
turn ON or OFF simultaneously.
Example: S1 and S2 has been configured as a single output parallel array (see Figure 9)
In order to disable the 48 V output, Enable/Disable 1 and 2 should be shorted together as
shown in Figure 9. With Enable/Disable 1 and 2 connected together, a single switch can
then be used to remotely enable and disable the output.
Note: For single output Maxi/Mini series power supply configurations, the simplest method of remotely
enabling and disabling the output is to use the General Shutdown (GSD) function.
General Shutdown/GSD (J3-7)
The GSD control pin on J3-7 allows simultaneous shutdown of all outputs. This pin
must be pulled down to less than 0.7 V, and will source 4 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 5 V to this input at
any time. Normal open circuit voltage is 1.5 to 3 V with respect to Signal Ground.
AC OK (J3-6)
AC OK is an active high TTL compatible signal and provides a status indication of the
AC input power. It is on pin J3-6 and is capable of sinking 16 mA maximum. This signal
switches to a TTL "1" when the high voltage bus exceeds low-line condition during turn-
on. Upon loss of input power, the bus voltage will drop, causing the AC OK signal to go
low. A minimum of 3 ms hold-up time is provided for a 1,200 W load following the loss
of the AC OK signal.
Load
V375A48C600A
V373A48C600A
V375A5C400A
1
2
3
4
5
6
7
8
9
1
2
3
1
2
3
1
2
3
J3
J1
S1
S2
S3
Figure 9.
Enable/Disable Control of Maxi,
Mini, Micro Series Module
Arrays