JFW48S12-1300 Datasheet, PDF (6/16 Pages) Wall Industries,Inc. – DC/DC Converter

TECHNICAL DATASHEET
JFW48S12-1300
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
=
1.0⁴ ∗ 2.5
Vo⁺ − 2.5 − 9.5
−
5110
(in Ω)
Vo⁺ is the desired up output voltage
Rdown
=
(Vo ^− − 2.5) ∗1.0⁴
Vout − (Vo ^− )
− 5110
(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⁺
12.12V
12.24V
12.36V
12.48V
12.6V
12.72V
12.84V
12.96V
13.08V
13.2V
R_up
203.223 kΩ
99.057 kΩ
64.334 kΩ
46.973 kΩ
36.557 kΩ
29.612 kΩ
24.652 kΩ
20.932 kΩ
18.038 kΩ
15.723 kΩ
Vo^–
11.88V
11.76V
11.64V
11.52V
11.4V
11.28V
11.16V
11.04V
10.92V
10.8V
R_down
776.557 kΩ
380.723 kΩ
248.779 kΩ
182.807 kΩ
143.223 kΩ
116.834 kΩ
97.985 kΩ
83.848 kΩ
72.853 kΩ
64.057 kΩ
(888) 597-WALL
www.wallindustries.com
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