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HKS48T30120 DC-DC Series Data Sheet
Half-Brick with 48VDC Input; 12VDC @ 32A Output
Output Voltage Adjustment
The trim feature allows the user to adjust the output
voltage from its nominal value.
The HKS trims up with a resistor from the Trim (# 7)
pin to the +Sense (# 8) pin and trims down with a
resistor from the Trim pin to the –Sense (# 6) pin as
shown in the Figure 15.
The equations below determine the trim resistor
value required to achieve a Δ V change in the output
voltage.
Radj ? up = ?
? k Ω
? Vo ( 100 + Δ %)
? 1 . 225 Δ %
?
( 100 + 2 Δ %) ?
Δ % ?
Figure 14. Trim Value Characteristic.
Radj ? down = ?
? 2 ? k Ω
? 100
? Δ %
?
?
Where Δ V% is the output voltage change expressed
in percent of the nominal output voltage, Vo.
(For example the maximum allowable percent
change increase is 10; [i.e., 1.2 V = 10%].)
Output Voltage Trim Values
R(KOhm)
887.39
447.59
Vo Up
12.12
12.24
R(KOhm)
98.00
48.00
Vo Down
11.88
11.76
300.99
227.69
183.71
154.39
133.45
117.74
12.36
12.48
12.6
12.72
12.84
12.96
31.33
23.00
18.00
14.67
12.29
10.50
11.64
11.52
11.4
11.28
11.16
11.04
Figure 15. Converter Trim Schematic
Notes:
1. When the output voltage is trimmed up, the output power from
the converter must not exceed its maximum rating. The power
is determined by measuring the output voltage on the output
pins, and multiplying it by the output current.
105.53
95.76
13.08
13.2
9.11
8.00
10.92
10.8
2.
In order to avoid creating apparent load regulation
degradation, it is important that the trim resistors be connected
directly to the remote sense pins, and not to the load or to
traces going to the load.
3.
4.
The output voltage increase can be accomplished either by the
trim or by the remote sense or by the combination of both. In
any case, the absolute maximum output voltage increase shall
not exceed the limits defined in the Features Specification
section above.
Either Rup or Rdown should be used to adjust the output
voltage according to the equations above. If both Rup and
Rdown are used simultaneously, they will form a resistive
divider and the equations above will not apply.
FEB 14, 2006 revised to MAY 17, 2006
Page 10 of 14
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