S48SP12003NRFB datasheet(9/14 Pages) DELTA

Part #	S48SP12003NRFB

Description	SMD and Through-hole versions

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Manufacturer	DELTA [Delta Electronics, Inc.]

Direct Link	http://www.deltaww.com

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DS_S48SP12003_10252013

9

FEATURES DESCRIPTIONS (CON.)

Output Voltage Adjustment

To increase or decrease the output voltage set point,

the modules may be connected with an external

resistor between the TRIM pin and either the Vo(+) or

Vo(-). The TRIM pin should be left open if this feature

is not used.

Note: Trim Pin is optional.

R

Load

Vo (+)

Trim

Vo (-)

R

trim-down

Vi (+)

Vi (-)

ON/OFF

R

Load

Vo (+)

Trim

Vo (-)

R

trim-down

Vi (+)

Vi (-)

ON/OFF

Vo (+)

Trim

Vo (-)

R

trim-down

Vi (+)

Vi (-)

ON/OFF

Figure 17: Circuit configuration for trim-down (decrease

output voltage)

If the external resistor is connected between the TRIM

and Vo(+) pins, the output voltage set point decreases

(Fig. 17). The external resistor value required to obtain

an output voltage change from 12V to the desired

Vo_adj, which is defined as:

Rtrim_down

Vo_adj

2.5

−

(

) 10000

⋅

12

Vo_adj

−

5110

−

Ex. When Trim-down -10%

Vo_adj=12V×(1-10%)=10.8V

Rtrim_down

10.8

2.5

−

(

) 10000

⋅

12

10.8

−

5110

−

Rtrim_down

6.406

10

4

×

=

ohm

Vo (+)

Trim

Vo (-)

R

Load

R

trim-up

Vi (+)

Vi (-)

ON/OFF

Vo (+)

Trim

Vo (-)

R

Load

R

trim-up

Vi (+)

Vi (-)

ON/OFF

Figure 18: Circuit configuration for trim-up (increase output

voltage)

If the external resistor is connected between the TRIM

and Vo(-) the output voltage set point increases (Fig.

18). The external resistor value required to obtain an

output voltage change from 12V to the desired Vo_adj,

which is defined as:

Rtrim_up

2.5 10000

⋅

Vo_adj

12

−

5110

−

Ex. When Trim-up +10%

Vo_adj=12V×(1+10%)=13.2V

Rtrim_up

2.5 10000

⋅

13.2

12

−

5110

−

Rtrim_up=1.572x10

4ohm

When using trim function, the output voltage of the

module is usually increased, which increases the power

output of the module with the same output current.

Care should be taken to ensure that the maximum

output power of the module remains at or below the

maximum rated power.

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