JFW48S15-1000 Datasheet, PDF (6/16 Pages) Wall Industries,Inc. – DC/DC Converter

TECHNICAL DATASHEET
JFW48S15-1000
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 −12.5
−
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⁺
15.15V
15.3V
15.45V
15.6V
15.75V
15.9V
16.05V
16.2V
16.35V
16.5V
R_up
161.557 kΩ
78.223 kΩ
50.446 kΩ
36.557 kΩ
28.223 kΩ
22.668 kΩ
18.7 kΩ
15.723 kΩ
13.409 kΩ
11.557 kΩ
Vo^–
14.85V
14.7V
14.55V
14.4V
14.25V
14.1V
13.95V
13.8V
13.65V
13.5V
R_down
818.223 kΩ
401.557 kΩ
262.668 kΩ
193.223 kΩ
151.557 kΩ
123.779 kΩ
103.938 kΩ
89.057 kΩ
77.483 kΩ
68.223 kΩ
(888) 597-WALL
www.wallindustries.com
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