Datasheet

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CUI Inc │ SERIES: VFK400W │ DESCRIPTION: DC-DC CONVERTER date 01/03/2014 │ page 5 of 6
1. Output Voltage Trimming
Leave open if not used.
101% 102% 103% 104% 105%
12 2.2 1.6 1.2 0.82 0.68
24 4.3 3.3 2.2 1.6 1.5
48 10 6.8 4.8 3.9 3.5
90% 92% 94% 96% 98%
12 9 12 22 51 100
24 12 22 51 100 300
48 22 32 49 100 300
Note: All specifi cations measured at 25°C, nominal input voltage, and full load unless otherwise noted.
Note: 1. VFK400W-Q48-S12 model requires minimum input voltage of 21.6 Vdc in order to trim between 100~105%.
APPLICATION NOTES
+Vin
R trim-down
R-Load
Trim
+Vo
+Sense
+Sense
-Sense
-Sense
-Vin
-Vo
Trim up
+Vin
-Vin
-Vo
+Vo
R trim-up
R-Load
Trim
Trim down
Figure 1
Table 1 Table 2
Application Circuit for Trim pin
Trim Up Resistor Values (M)
1
Trim Down Resistor Values (K)
Desired Vout
(%Vout)
Desired Vout
(%Vout)
Nom. Vout
(Vdc)
Nom. Vout
(Vdc)
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