Vicor PFC Micro Power Factor Corrected AC-DC Switcher User Manual
Page 14
PFC Micro Design Guide
The Sense connector for a single output board is a 3 pin connector providing the +Sense connection on S1/S2 J2-2
and the -Sense connection on S1/S2 J2-3. The Sense connector for a dual output board is provided on the 18 pin
output connector that also provides the output and trim connections. +Sense and -Sense for the first output are
located on S1/S2 J1-13 and S1/S2 J1-15, respectively. +Sense and -Sense for the second output are located on
S1/S2 J1-4 and S1/S2 J1-5, respectively. Remote sense is not available for Triple output configurations.
External Trim (S1/S2 J2)
The Trim pin at S1/S2 J2 is referenced to the -Sense pin and can be used for external control of the output volt-
age. For triple output cards, the Trim pins are available on S1/S2 J2-14, S1/S2 J2-6 and S1/S2 J2-3 for outputs 1,
2 and 3 respectively. For dual output cards, the Trim pins are available at S1/S2 J2-6 and S1/S2 J2-14 for outputs
1 and 2, respectively. For a single output card , the Trim pin is S1/S2 J2-1. A 10% increase to the trim pin volt-
age will result in a 10% increase in output voltage. Reducing the trim pin voltage by 10% will result in a 10%
decrease in output voltage.
OUTPUT MODULE
V
ref
R
TH
VI-200/VI-J00
≥3.3V
2.5V
10k
Ω
VI-200/VI-J00 <3.3V
0.97V
3.88k
Ω
Maxi (Predefined)
1.23V
1k
Ω
Maxi (Userdefined)
1.23V
Consult Factory
Table 2. Module Internal Reference Voltages and Thevenin Resistances.
Load
+Out
+Sense
-Sense
-Out
Use 20-22 AWG
Twisted Pair Wires
Figure 5. Remote Sense
(Remote Sense)
Load
+P +Out
S1/S2 J2-2 +Sense
S1/S2 J2-3 -Sense
-P -Out
Use 20-22 AWG Twisted Pair Wires
2.5V
Ref.
S1/S2 J2-1
R6
R8
R7
To Error
Amplifier
+
V
2
-
Use 20-22 AWG Twisted Pair Wires
Figure 6. External Trim
Pg. 14
Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474
03-000048 rev A