JF48S12-1250 Datasheet, PDF (6/15 Pages) Wall Industries,Inc. – DC/DC Converter

TECHNICAL DATASHEET
JF48S12-1250
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 4
-Vout
RT1
Trim
RT2
+Vout
Trim
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
Table 3 Trim Resistor Values
Vo⁺
R_up
Vo^–
R_down
12.12V 203.223 kΩ 11.88V 776.557 kΩ
12.24V 99.057 kΩ 11.76V 380.723 kΩ
12.36V 64.334 kΩ 11.64V 248.779 kΩ
12.48V 46.973 kΩ 11.52V 182.807 kΩ
12.6V 36.557 kΩ 11.4V 143.223 kΩ
12.72V 29.612 kΩ 11.28V 116.834 kΩ
12.84V
12.96V
13.08V
24.652 kΩ
20.932 kΩ
18.038 kΩ
11.16V
11.04V
10.92V
97.985 kΩ
83.848 kΩ
72.853 kΩ
13.2V 15.723 kΩ 10.8V 64.057 kΩ
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www.wallindustries.com
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