Vicor Westcor PFC Mini Power Factor Corrected AC-DC Switcher - Manual (Page 15)

UG:115 vicorpower.com Applications Engineering: 800 927.9474 Page 15
Load
+Out
+Sense
-Sense
-Out
Use 20-22 AWG Twisted Pair Wires
Figure 6.
Remote Sense
(Remote Sense)
Load
+P +Out
SxJ2-2 +Sense
SxJ2-3 -Sense
-P -Out
Use 20-22 AWG Twisted Pair Wires
R5
V Ref
SxJ2-1
R6
R8
R7
To Error
Amplifier
R4
R3
R2
R1
+
+
V
2
V 1
-
-
RTH
Use 20-22 AWG
Twisted Pair Wires
Figure 7.
External Trim
Output Module V
ref
R
TH
VI-200/VI-J00 ≥3.3 V 2.5 V 10.0 kΩ
VI-200/VI-J00 <3.3 V 0.97 V 3.88 kΩ
Maxi, Mini Micro series (Predefined) 1.23 V 1 kΩ
Maxi, Mini Micro series (User Defined) 1.23 V Consult Factory
External Trim (SxJ2/SxJ1)
The Trim pin at SxJ2 is referenced to the -Sense pin and can be used for external control
of the output voltage. For dual output cards, the Trim pins are available at SxJ1-14 and
SxJ1-6 for outputs 1 and 2, respectively. A 10% increase to the trim pin voltage 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.
Note: Converters are sometimes pre-trimmed at the factory if a nonstandard output voltage is
requested. If a nonstandard voltage is requested, the resistor calculations will differ from those that
follow. Consult Vicor Applications Engineering for assistance.
Table 1.
Module Internal Reference
Voltages and Thevenin
Resistances