LV12S20-100 Datasheet, PDF (6/15 Pages) Wall Industries,Inc. – Low Voltage DC-DC Converter 10-36 Vdc Input 20Vdc Output at 5A Half-Brick Package

Rev. D
TECHNICAL DATASHEET
LV12S20-100
Output Voltage Trim: (5V, 12V, 15V, and 20V Models)
The output is adjustable +/–10% of rated output voltage. To trim the output voltage down, place the trim resistor
between the Trim and -Rs pins (Figure 5). To trim the output voltage up, place the trim resistor between the Trim
and +Rs pins (Figure 4).
The value of the trim resistor with respect to the desired output voltage (Vo) can be derived from the following
formulas, or looked up on the trim table (Table 2).
R1 ⋅Vo ⋅ ^Vonom
RTH =
U1 _−
R1 ⋅Vo
− R lim
Vo −Vonom Vo −Vonom
(in Kohms)
RTL = ^R1⋅Vo − R lim
Vonom − Vo
(in Kohms)
Figure 4: Trim Up
+V_out
+Rs
Pins Facing Down Trim
-Rs
-V_out
RTH
Figure 5: Trim Down
+V_out
+Rs
R_load
Pins Facing Down _Trim
-Rs
-V_out
RTL
R_load
Table 2: Trim Equations for LV Series (5V, 12V, 15V, and 20V Models)
Vonom
20.000
U1 R1 Rlim RTH to +Rs
2.500 5.11 5.11 RTL to -Rs
Percent
Trim
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
Trim Low
Vo RTL
19.800 500.78
19.600 245.28
19.400 160.11
19.200 117.53
19.000 91.98
18.800 74.95
18.600 62.78
18.400 53.66
18.200 46.56
18.000 40.88
Trim High
Vo RTH
20.200 3607.66 All in Kohms
20.400 1819.16
20.600 1222.99
20.800 924.91
21.000 746.06
21.200 626.83
21.400 541.66
21.600 477.79
21.800 428.10
22.000 388.36
Note that while decreasing the output voltage, the
maximum output current still remains at 5A, and
while increasing the output voltage, the output
current is reduced to maintain a total output power
at 100 W.
(888) 597-WALL
www.wallindustries.com
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