JF48S3.3-3500 Datasheet, PDF (6/15 Pages) Wall Industries,Inc. – DC/DC Converter

TECHNICAL DATASHEET
JF48S3.3-3500
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 − 0.8
−
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 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
3.333V 385.071 kΩ 3.267V 116.719 kΩ
3.366V 191.511 kΩ 3.234V 54.779 kΩ
3.399V 126.99 kΩ 3.201V 34.133 kΩ
3.432V 94.73 kΩ 3.168V 23.810 kΩ
3.465V 75.374 kΩ 3.135V 17.616 kΩ
3.498V 62.47 kΩ 3.102V 13.486 kΩ
3.531V
3.564V
3.597V
53.253 kΩ
46.34 kΩ
40.963 kΩ
3.069V
3.036V
3.003V
10.537 kΩ
8.325 kΩ
6.604 kΩ
3.63V 36.662 kΩ 2.97V 5.228 kΩ
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