V375C28H150B Vicor Corporation, V375C28H150B Datasheet - Page 5

• Manufacturer Part Number: V375C28H150B
• Manufacturer: Vicor Corporation

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CONTROL FUNCTIONS - SC PIN
Output Voltage Programming
The output voltage of the converter can be adjusted or
programmed via fixed resistors, potentiometers or voltage
DACs. See Figures 7 and 8.
Trim Down
1. This converter is not a constant power device – it has a
2. The trim down resistor must be connected to the –Out pin.
Figure 7—Output voltage trim down circuit.
Error
Amp
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.
1k
0.033 F
1.23V
R
D
+Out
–Out
(ohms) =
SC
Set your site on VICOR at www.vicorpower.com
1,000 Vout
Vnom - Vout
Trim Down
R
D
Load
V375C28C150B DC-DC Converter
Figure 8—Output voltage trim up circuit.
Trim Up
1. The converter is rated for a maximum delivered power. To ensure
2. The trim up resistor must be connected to the +Out pin.
3. Do not trim the converter above maximum trim range
Error
Amp
Trim resistor values calculated automatically:
On-line calculators for trim resistor values are available
on the vicor website at: vicorpower.com/tools.html.
Resistor values can be calculated for fixed trim up, fixed
trim down and for variable trim up or down cases for both
1st and 2nd Generation DC-DC converters.
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.
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.
1k
0.033 F
1.23V
R
U
(ohms) =
1,000 (Vout-1.23) Vnom
+Out
–Out
SC
1.23 (Vout-Vnom)
Trim Up
R
U
Rev. 3
– 1,000
Load
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