V375A5C400B Vicor Corporation, V375A5C400B Datasheet - Page 10

• Manufacturer Part Number: V375A5C400B
• Manufacturer: Vicor Corporation

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The output voltage of the converter can be adjusted or
programmed via fixed resistors, potentiometers or voltage
DACs. See Figures 7 and 8.
Figure 7 — Output voltage trim down circuit.
1. This converter is not a constant power device – it has a
2. The trim down resistor must be connected to the –Sense pin.
Error
constant current limit. Hence, available output power is
reduced by the same percentage that output voltage is
trimmed down. Do not exceed maximum rated output
current.
Amp
1 kΩ
0.033 μF
1.23 V
R
D
(ohms) =
+OUT
–OUT
SC
+S
–S
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Vnom – Vout
1,000 Vout
Trim Down
R
D
Load
375V Maxi Family
Figure 8 — Output voltage trim up circuit.
1. The converter is rated for a maximum delivered power. To
2. The trim up resistor must be connected to the +Sense pin.
3. Do not trim the converter above maximum trim range
On-line calculators for trim resistor values are available
on the vicor website at: vicorpower.com/tools.
Resistor values can be calculated for fixed trim up,
fixed trim down and for variable trim up or down.
In addition to trimming information, the web site and
the Applications Manual also include design tips,
applications circuits, EMC suggestions, thermal design
guidelines and PDF data sheets for all available Vicor
products.
Error
Amp
ensure that maximum rated power is not exceeded, reduce
maximum output current by the same percentage increase in
output voltage.
(typically +10%) or the output over voltage protection
circuitry may be activated.
1 kΩ
R
U
(ohms) =
0.033 μF
1.23 V
1,000 (Vout –1.23) Vnom
1.23 (Vout – Vnom)
+OUT
–OUT
SC
+S
–S
Rev. 8.4
Trim Up
R
U
– 1,000
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