TECHNICAL DATASHEET

Rev. D

LV12S5-100

(888) 597-WALL

www.wallindustries.com

Page 6 of 15

Figure 4: Trim Up

Figure 5: Trim Down

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).

Table 2: Trim Equations for LV Series (5V, 12V, 15V, and 20V Models)

Vonom

U1

R1

Rlim RTH to +Rs

5.000

2.500

5.11

5.11 RTL to -Rs

Percent

Trim Low

Trim High

Trim

Vo

RTL

Vo

RTH

1%

4.950

500.78

5.050

511.00 All in Kohms

2%

4.900

245.28

5.100

255.50

3%

4.850

160.11

5.150

170.33

4%

4.800

117.53

5.200

127.75

5%

4.750

91.98

5.250

102.20

6%

4.700

74.95

5.300

85.17

7%

4.650

62.78

5.350

73.00

8%

4.600

53.66

5.400

63.88

9%

4.550

46.56

5.450

56.78

10%

4.500

40.88

5.500

51.10

Pins Facing Down

+Rs

Trim

-Rs

RTL

Pins Facing Down

+Rs

Trim

-Rs

RTH

(in Kohms)

Note that while decreasing the output voltage, the

maximum output current still remains at 20A, and

while increasing the output voltage, the output current

is reduced to maintain a total output power at 100 W.

lim

1

lim

1

1

1

R

V

V

V

R

RTL

R

V

V

V

R

V

V

U

V

V

R

RTH

o

onom

o

onom

o

o

onom

o

onom

o

−

−

⋅

=

−

−

⋅

−

−

⋅

⋅

=

(in Kohms)