SLAN-03D2A0 Datasheet, PDF (15/25 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
3 Vdc – 14.4 Vdc Input, 0.6 Vdc - 5.5 Vdc /3 A Outputs
Mar. 16, 2012
Output Voltage Programming(continued)
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Without an external resistor between Trim and GND pins, the output of the module will be 0.6Vdc. To calculate
the value of the trim resistor, Rtrim for a desired output voltage, should be as per the following equation:
Rtrim  _{Vo}¹_^20.6_{}k
Rtrim is the external resistor in kΩ
V_o is the desired output voltage.
Table1
V_{O, set} (V)
0.6
0.9
1.0
1.2
1.5
1.8
2.5
3.3
5.0
Rtrim (KΩ)
Open
40
30
20
13.33
10
6.316
4.444
2.727
Remote Sense
The power module has a Remote Sense feature to minimize the effects of distribution losses by regulating the
voltage at the SENSE pin. The voltage between the SENSE pin and VOUT pin should not exceed 0.5V.
Voltage Margining
Output voltage margining can be implemented in the module by connecting a resistor, R_margin-up, from the Trim pin
to the ground pin for margining-up the output voltage and by connecting a resistor, R_margin-down, from the Trim pin
to output pin for margining-down. Figure 43 shows the circuit configuration for output voltage margining. The
POL Programming Tool, available at www.lineagepower.com under the Downloads section, also calculates the
values of R_margin-up and R_margin-down for a specific output voltage and % margin. Please consult your local Bel
Power technical representative for additional details.
Figure 43
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rt rim
Q1
GND
Circuit Configuration for margining Output voltage.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302  Tel [phone]  Fax [phone]  www.belfuse.com
15