AC-DC POWER SUPPLIES

ASB75 Series

6

Trim Down (%)

12V

15V

24V

36V

48V

Rd (kΩ)

5

82

130

180

330

390

10

9.1

30

20

30

39

Applications Notes

Output Voltage Adjustment

+Vo

Trim down

Trim up

Trim

-Vo

+Vo

Trim

-Vo

Rd

Ru

Load

Load

50

60

70

80

90

100

10

20

30

40

50

60

70

80

90

100

50

60

70

80

90

100

10

20

30

40

50

60

70

80

90

100

115 VAC

230 VAC

115 VAC

230 VAC

The Trim input permits the user to adjust the output voltage up or down by 10%.

This is accomplished by connecting an external resistor between the Trim pin and either the +Vo pin or the -Vo pin.

Connecting an external resistor (Rd) between the Trim pin and the +Vo pin decreases the output voltage. The following table can be used to determine

the required external resistor value to obtain a percentage output voltage change of Δ%.

To Trim Down

Connecting an external resistor (Ru) between the Trim pin and the -Vo pin increases the output voltage. The following table can be used to determine

the required external resistor value to obtain a percentage output voltage change of Δ%.

To Trim Up

Trim Up (%)

12V

15V

24V

36V

48V

Ru (kΩ)

5

130

150

249

280

412

10

33

50

47

39

91

+Vo

Trim down

Trim up

Trim

-Vo

+Vo

Trim

-Vo

Rd

Ru

Load

Load

50

60

70

80

90

100

10

20

30

40

50

60

70

80

90

100

50

60

70

80

90

100

10

20

30

40

50

60

70

80

90

100

115 VAC

230 VAC

115 VAC

230 VAC