Vicor VI-J00 Family DC-DC Converters and Configurable Power Supplies - Manual (Page 12)

Design Guide & Applications Manual
For VI-200 and VI-J00 Family DC-DC Converters and Configurable Power Supplies
VI-200 and VI-J00 Family Design Guide Rev 3.5 vicorpower.com
Page 11 of 98
Apps. Eng. 800 927.9474 800 735.6200
OVERVIEW
A number of GATE IN pins may be connected for remote
shut down and logic disable. (Figure 6-1) Diodes D1 and
D2 provide isolation and prevent multiple failures if the
GATE IN of a module becomes shorted to the +IN. The
Zener diodes Z1, Z2 and capacitors C1, C2 attenuate
transient voltage spikes caused by differential inductance
in the negative lead. Capacitors C1 and C2 will also lengthen turn-on time. SW1 is a mechanical or solid state
switch that is used to disable both Driver modules. C3 is
used to minimize the effects of “switch bounce” associated
with mechanical devices.
NOTE: GATE IN voltage needs to be <0.65 V
referenced to –IN to ensure modules are disabled.
+IN
–IN
GATE
OUT
GATE
IN
+IN
–IN
GATE
OUT
GATE
IN
Vicor
DC-DC Converter
F1
C1
Z1
C3
SW1
F2
DISABLE
D2
Z2 C2
D1
Vicor
DC-DC Converter
6. Multiple GATE IN Connections
C1, C2, C3 = 1 µF
Z1, Z2 = 15 V (1N5245B)
D1, D2 = Small signal diode (1N4148)
[a]
[a]
For bus voltages greater than 75 V,
a 1N4006 diode should be used.
NOTE: The –IN to –IN input lead should be kept as short as possible to minimize differential inductance.
Heavy lines indicate power connections. Use suitably sized conductors.
Opto-couplers or relays should be used to isolate GATE IN connections, if the converters are on
separate boards or the negative input lead’s impedance is high.
Figure 6–1 — Protection for multiple GATE IN connections