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Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474
Rev. 2/2012
FlatPAC-EN/EN MI Design Guide
Enable/Disable Mode (CBJ1-8 and CBJ1-9)
The Enable/Disable control pins allow outputs to be sequenced either on or off. CBJ1-4 through CBJ1-9 are the
control pins for outputs 1 through 4. The Enable/Disable pins should be pulled low to less than 0.7V with respect
to Signal Ground to disable the outputs. They will source 9mA maximum. These pins should be open circuited or
allowed to exceed 4.5V when enabled. Do not apply more than 5V to these inputs.
The correspondence between a module and its E/D line as seen from the output end of the power supply goes from
left to right.
General Shutdown /GSD (CBJ1-10)
The GSD control pin on CBJ1-10 allows simultaneous shutdown of all outputs. This pin must be pulled down to
less than 0.7V, and will source 9mA 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 5V to this
input at any time. Normal open circuit voltage is 1.5 to 4V with respect to Signal Ground.
Auxiliary Vcc +5V/300mA (CBJ1-12)
The Vcc on CBJ1-12 is an auxiliary 5V regulated power source. It is +5 Vdc +/–5% with respect to Signal Ground
and can supply 300 mA maximum. It is capable of withstanding a short, but shorted user interface functionality
will be lost.
+Sense/ –Sense ( J2) (Not applicable when using BatMod current source.)
The sense lines for the outputs are shipped from the factory with Autosense. Autosense provides the user with
automatic sensing of the outputs. With Autosense, the FlatPAC-EN/EN MI will automatically operate in a Remote
Sense mode when the Remote Sense connections are made. But in the event that the Remote Sense is not connect-
ed or needed, no Local Sense selection is necessary - simply hook up the outputs and the FlatPAC-EN will auto-
matically operate in Local Sense mode. To check if an output has the Autosense feature, measure the impedance
from the + Out to + Sense and - Out to - Sense pins. If the impedance is 5 ohms, then the output has Autosense
and does not require local sense jumpers. When using the remote sense feature, the +Out and -Out load wires
should never be disconnected while the supply is operating. Failing to do so could damage the power supply.
In the local sense mode (Remote Sense lines not connected), the power supply will regulate the output at the output
terminals. The voltage appearing at the load may drop slightly due to voltage drop in the power cables. If it is nec-
essary to compensate for voltage drop along the output power cables, the output can be trimmed up or configured
for Remote Sense. Use stranded twisted pair 24-30 AWG wire for the Remote Sense lines. Remote Sense can com-
pensate for a voltage drop of up to 0.5V, or 0.25V on each leg.
The Sense connector for outputs with stud connectors is a 3 pin connector providing the +Sense connection on J1/
J2-2 and the - Sense connection on J1/J2-3. The Sense connector for outputs with 18 pin Molex connectors is pro-
vided on the 18 pin output connector that also provides the output and trim connections. See page 11 for details.
Note: Remote sense is not available for output configurations using the Micro modules.
FlatPAC-EN
4
7
Signal Ground
General Shutdown
Enable/Disable Output 1
J1
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 7 for GSD) is pulled Low
with respect to Signal Ground.
5
Vcc
1
Enable/Disable Control
Figure 5: Enable/Disable Mode
78M05
Auxiliary Vcc
CBJ1-12
0.1 µF
Signal Ground
CBJ1
CBJ1-1
+5V/300 mA
Figure 6: Auxiliary Vcc
