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H24SN28012PRFB Datasheet(PDF) 10 Page - Delta Electronics, Inc.

Part # H24SN28012PRFB
Description  Delphi Series H24SN, 350W Half Brick Family DC/DC Power Modules: 18~36Vin, 28V/12.5A out
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

H24SN28012PRFB Datasheet(HTML) 10 Page - Delta Electronics, Inc.

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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
SENSE(+) or SENSE(-). The TRIM pin should be left
open if this feature is not used.
Figure 17: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig. 17). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Rtrim down=
100
∆%
2
⎛⎜
ΚΩ
Ex. When Trim-down -60%(28.0V×0.6=16.8V)
Vo
28.0
:=
V
40
:=
100
2
0.5
=
K
Figure 18: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases
(Fig. 18). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
Rtrim up= Vo 100 ∆%
+
(
)
1.225
∆%
100
2
∆%
+
∆%
ΚΩ
Ex. When Trim-up +10%(28.0V×1.1=30.8V)
Vo
28.0
:=
V
10
:=
Vo
100
+
()
1.225
100
2
+
239.429
=
K
The output voltage can be increased by both the remote
sense and the trim, however the maximum increase is
the larger of either the remote sense or the trim, not the
sum of both.
When using remote sense and trim, 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.
H24SN28012_07272006
10


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