H48SA53010 Datasheet, PDF (9/13 Pages) Delta Electronics, Inc. – Industry standard pin out

FEATURES DESCRIPTIONS (CON.)
Output Voltage Adjustment (TRIM)
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 Vout (+)
or Vout (-). The TRIM pin should be left open if this
feature is not used.
Vout(+)
Imon
Trim
Ishare
Vout(-)
Rtrimup
Rload
Figure 16: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and Vout (+) pins, the output voltage set point
increases (Fig. 15). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Rtrimup ^{Vout100  %}  ^{100  2%} K
 ^{1.225%}
% _
Ex. When trim up to 56.7V from 54V
% = 100*(56.7-54)/54 = 5
Rtrimup ^{54}_{1(.1202055} ⁵⁾

100  2 
5
5_{ K}
Rtrim_up = 903.7 kΩ
Vout(+)
Imon
Trim
Ishare
Vout(-)
Rtrimdown
Rload
Figure 17: Circuit configuration for trim-down (decrease output
voltage)
If the external resistor is connected between the TRIM
and Vout (-), the output voltage set point decreases (Fig.
16). The external resistor value required to obtain a
percentage of output voltage change △% is defined as
Rtrimdown ^{ 100}  2^ K
 ^% 
Ex. When trim down to 51.3V from 54V
 %= 100*(54-51.3)/54 = 5
Rtrimdown

100
5

2^{}
K
Rtrim_down = 18 kΩ
The typical resistor value can be seen in below figure17.
Output voltage
56.7V
51.3V
Resistor value ( k )
903.7
18
Figure 18: Trim resistor value example for popular output
voltages
When using trim function to increase output voltage, the
output power should increase accordingly. Care should be
taken to ensure that the maximum output power of the
module remains at or below the maximum rated power.
DS_H48SA53010_10212014
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