Datasheet

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CUI Inc │ SERIES: VHK200W │ DESCRIPTION: DC-DC CONVERTER date 12/16/2013 │ page 6 of 7
20V
O, nom
(100 + ∆%) 2000
R
trim - up = ( - - 40)
(KΩ)
1.225 x ∆%∆%
Trim-Down Formula
(for all 12, 15, 24, & 28
1
Vdc Output Models)
APPLICATION NOTES
1. Output Voltage Trimming
Leave open if not used.
+Sense
-Sense
Trim up
+Vin
-Vin
-Vo
+Vo
R trim-up
R-Load
Trim
Trim dow
n
+Vin
R trim-down
R-Load
Trim
+Vo
+Sense
-Sense
-Vin
-Vo
∆%
= ( )100
V
o, nom
- V
o
V
o, nom
5.11V
O, nom
(100 + ∆%) 511
R
trim - up = ( - - 10.22)
(KΩ)
1.225 x ∆%
∆%
511
R
trim - down = ( - 10.22)
(KΩ)
∆%
2000
R
trim - down = ( - 40)
(KΩ)
∆%
Figure 4
Formula for Trim Resistor
Application Circuit for Trim pin
Trim-Up Formula
(for all 12, 15, 24, & 28
1
Vdc Output Models)
Trim-Up Formula
(for all 48 Vdc Output Models)
Trim-Down Formula
(for all 48 Vdc Output Models)
Notes: 1. For the 28 Vdc output models, a minimum input voltage of 10.8 Vdc is required to trim the 24 Vdc input models up 10%, and a minimum input voltage of 19 Vdc is
required to trim the 48 Vdc input models up 10%.
 2.AllspecicationsaremeasuredatTa=25°C,nominalinputvoltageandfulloutputloadunlessotherwisespecied.
Note: R
trim-up
istheexternalresistorinKΩ
R
trim-down
istheexternalresistorinKΩ
V
O, nom
is the nominal output voltage
V
O
is the desired output voltage
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