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| 型號(hào)： | FHS18Z28NT |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 500 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 742K |
| 代理商： | FHS18Z28NT |
REV. JUN 09, 2004
Page 7 of 11
FHS DC-DC Series Data Sheet
500-Watt, Full-Brick Converter
If sense pins are not connected to the load, or the
respective output pins, the converter will not be
damaged, but may not meet the output voltage
regulation specifications.
Output Voltage Trim
The trim feature allows the user to adjust the output
voltage from the nominal value. This can be used to
compensate for distribution drops, perform margining
in production, or accommodate other requirements
when output voltage needs to be adjusted from the
nominal value. There are two trim options available.
Optional Positive Trim (suffix –T)
The -T option units trim up with a resistor from the
TRIM pin to the (+)Vsense pin and trim down with a
resistor from the TRIM pin to the (-)Vsense RTN pin
as shown in Figure 7.
Figure 7. FHS Series Positive Trim Schematic (-T)
The equations below determine the trim resistor
value required to achieve a
% change in the output
voltage.
+
=
k
Vonom
up
Radj
)
2
.
42
%
510
%
%)
100
(
17
.
4
=
k
down
Radj
)
2
.
42
%
510
where
% is the output voltage change expressed
in percent of the nominal output voltage, Vout.
(example: to trim up or down by 5% of Vo nominal,
% = 5)
Negative Logic Trim (no P/N suffix)
The negative logic trim unit trims down with a
resistor from Trim to Vsense, and trims up with a
resistor from Trim to VsenseRTN (see figure 8).
Figure 8. FHS Series Negative Trim Schematic
The equations below determine the trim resistor
value required to achieve a new output voltage.
=
k
Voadj
up
Radj
20
1
))
225
.
1
/(
4
.
54
*
225
.
1
/(
49
.
2
49
.
2
=
k
Voadj
down
Radj
20
1
))
225
.
1
(
03
.
2
/(
4
.
54
4
.
54
where Voadj is the desired output voltage
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