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V24A5E200BL2 Datasheet, PDF (9/13 Pages) Vicor Corporation – 24V Input Maxi Family DC-DC Converter Module
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.
Error
Amp
1 kΩ
0.033 μF
1.23 V
+OUT
+S
SC
–S
–OUT
RD
Trim Down
Load
RD (ohms)
=
1,000 Vout
Vnom – Vout
Figure 7 — Output voltage trim down circuit.
Trim Down
1. This converter is not a constant power device – it has a
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.
2. The trim down resistor must be connected to the –Sense pin.
Error
Amp
1 kΩ
0.033 μF
1.23 V
+OUT
+S
SC
–S
–OUT
RU
Trim Up
Load
RU (ohms)
=
1,000 (Vout –1.23) Vnom
1.23 (Vout – Vnom)
– 1,000
Figure 8 — Output voltage trim up circuit.
Trim Up
1. The converter is rated for a maximum delivered power. To
ensure that maximum rated power is not exceeded, reduce
maximum output current by the same percentage increase in
output voltage.
2. The trim up resistor must be connected to the +Sense pin.
3. Do not trim the converter above maximum trim range
(typically +10%) or the output over voltage protection
circuitry may be activated.
Trim resistor values calculated automatically:
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.
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
24V Maxi Family
Set your site on VICOR at vicorpower.com
Rev. 4.9
Page 9 of 13