S48SP12003NRFB View Datasheet(PDF) - Delta Electronics, Inc.

Part Name

Description

Manufacturer

S48SP12003NRFB

Delphi Series S48SP, 35W 1x1 Brick DC/DC Power Modules: 48V in, 3.3V/10A out

Delta Electronics, Inc. 

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.

ON/OFF Vo (-)

Vi (-)

Vi (+)

Trim

Vo (+)

R

trim-down

R

Load

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 3.3V to the desired

Vo_adj is defined as:

Rtrim_down

( Vo_adj − 2.5 ) ⋅ 5110 − 2050

3.3 − Vo_adj

Ex. When Trim-down -10%

Vo_adj=3.3V×(1-10%)=2.97V

Rtrim_down

( 2.97 − 2.5 ) ⋅ 5110 − 2050

3.3 − 2.97

Rtrim_down = 5.228× 103 ohm

ON/OFF Vo (-)

Vi (-)

Vi (+)

Trim

Vo (+)

R

trim-up

R

Load

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 3.3V to the desired Vo_adj

is defined as:

Rtrim_up

2.5 ⋅ 5110 − 2050

Vo_adj − 3.3

Ex. When Trim-up +10%

Vo_adj=3.3V×(1+10%)=3.63V

Rtrim_up

2.5 ⋅ 5110 − 2050

3.63 − 3.3

Rtrim_up = 3.666× 104 ohm

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.

DS_S48SP3R310_10252013

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