vi-882559 Vicor Corporation, vi-882559 Datasheet - Page 5

• Manufacturer Part Number: vi-882559
• Description: 24vin 15vout 200watts Dc-dc Converter Module
• Manufacturer: Vicor Corporation

Vicor Corp. Tel: [phone] Fax: [phone]
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 & 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 –Sense pin.
Figure 7—Output voltage trim down circuit.
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.
Error
Amp
1k
1.23V
0.033
F
R
D
(ohms) =
+Out
–Out
+S
SC
–S
Set your site on VICOR at www.vicorpower.com
1,000 Vout
Vnom - Vout
Trim Down
R
D
Load
24Vin/15Vout/200w 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 +Sense pin.
3. Do not trim the converter above maximum trim range
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 periodically activated.
Error
Amp
Trim values calculated automatically:
Resistor trim calculators are available on Vicor’s
web site at URL: www.vicr.com/tools.html
or by requesting a copy of Vicor’s
Applications Manual on a CD ROM.
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 on
CD ROM also include design tips,
applications circuits, EMC suggestions,
thermal design guidelines and PDF data
sheets for all available Vicor products.
1k
1.23V
R
0.033
U
F
(ohms) =
1,000 (Vout-1.23) Vnom
+Out
–Out
1.23 (Vout-Vnom)
+S
SC
–S
Rev. 5.2
Trim Up
R
U
- 1,000
Page 5 of 9
Load