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NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 13.2 Vdc Input
0.9 Vdc - 5.0 Vdc/15 A Output
Output Trim Equations
Equations for calculating the trim resistor (in k ? ) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between
the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of
the resistors should be used for any given application.
R TrimDown
=
A
V nom ? V adj
? B
Module
Vout
Trim
Rtrimdown
GND
Vout
R TrimUp =
V adj
C
? V nom
? D
Module
Trim
GND
Rtrimup
Vnom
0.9 - 3.63
5.0
3.3
2.5
1.8
1.5
1.2
0.9
A
N/A
31.574
18.8157
12.7927
7.5426
5.2865
3.027
N/A
B
N/A
19.010
25.310
30.110
39.110
33.610
24.410
N/A
C
6.008
6.008
6.008
6.008
6.008
6.008
6.008
6.008
D
2.150
11.50
17.800
22.600
31.600
26.100
16.900
64.900
Efficiency Data
100%
95%
90%
MODULE 5.0V
100.0%
95.0%
90.0%
MODULE 3.3V
85%
80%
75%
12V
85.0%
80.0%
75.0%
70.0%
5V
12V
70%
1.5
3.75
7.5
11.25
15.0
1.5
3.75 7.5 11.25
OUTPUT CURRENT
15.0
OUTPUT CURRENT
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 ? Tel 201-432-0463 ? Fax 201-432-9542 ? www.belfuse.com
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