JFW48S5-3000 Datasheet, PDF (6/16 Pages) Wall Industries,Inc. – DC/DC Converter

TECHNICAL DATASHEET
JFW48S5-3000
External Trim Adjustment
Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of a
module. This is accomplished by connecting an external resistor between the TRIM pin and either the +Vout or
-Vout pins. With an external resistor between the TRIM and +Vout pin, the output voltage set point decreases.
With an external resistor between the TRIM and -Vout pin, the output voltage set point increases.
Rup
=
5110 ∗ 2.5
Vo⁺ − 2.5 − 2.5
−
2050
(in Ω)
Vo⁺ is the desired up output voltage
Rdown
=
(Vo ^− − 2.5) ∗ 5110
Vout − (Vo ^− )
−
2050
(in Ω)
Vo^- is the desired down output voltage
-Vin
+Vin
Figure 7
-Vout
RT1
Trim
RT2
+Vout
Trim
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
Table 3 Trim Resistor Values
Vo⁺
5.05V
5.1V
5.15V
5.2V
5.25V
5.3V
5.35V
5.4V
5.45V
5.5V
R_up
253.45 kΩ
125.7 kΩ
83.117 kΩ
61.825 kΩ
49.05 kΩ
40.533 kΩ
34.450 kΩ
29.888 kΩ
26.339 kΩ
23.5 kΩ
Vo^–
4.95V
4.9V
4.85V
4.8V
4.75V
4.7V
4.65V
4.6V
4.55V
4.5V
R_down
248.34 kΩ
120.59 kΩ
78.007 kΩ
56.715 kΩ
43.94 kΩ
35.423 kΩ
29.34 kΩ
24.778 kΩ
21.229 kΩ
18.39 kΩ
(888) 597-WALL
www.wallindustries.com
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