参数资料
| 型号： | QMS25DE-N |
| 厂商： | Power-One |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | FRONT PANEL 8TE |
| 标准包装： | 10 |
| 系列： | * |
QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Output Voltage Adjustment (Trim)
QMS25DE Trim Values:
Vo Increase
Vo Decrease
The industry-standard trim feature allows the user to adjust
the output voltage from its nominal value. This can be used
to accommodate production margin testing.
Output voltage adjustment is accomplished by connecting
an external resistor between the Trim pin and to either the
+V OUT or –V OUT pins. That below defines the two versions
as well as trim equations used to determine a trim resistor
value for a certain trim voltage.
Δ Vo%
1
2
3
4
5
6
7
8
9
10
R -UP New Vo
(K ? ) (V DC )
869 3.33
436 3.37
292 3.40
220 3.43
177 3.47
148 3.50
127 3.53
112 3.56
100 3.60
90 3.63
Δ Vo%
1
2
3
4
5
6
7
8
9
10
R -DOWN New Vo
(K ? ) (V DC )
501 3.27
245 3.23
160 3.20
118 3.17
92 3.14
75 3.10
63 3.07
54 3.04
47 3.00
41 2.97
Figure 31. QMS Trim Schematic
With an external resistor ( R UP ) connected between the
Trim pin and +V OUT pin, the output voltage set-point (Vo)
increases. The following equation determines the required
external resistor value to obtain an adjusted output
voltage:
? ?
? 10 . 22 ? ? ??
R UP
? 5 . 11 ? Vout ? (100 ? ? V %)
? 1 . 225 ? V %
?
511
? V %
?
?
Figure 33. QMS25DE Trim Characteristics
QMS14DG Trim Values
Where Δ % is the percentage change from Vo NOM .
Δ Vo%
Vo Increase
R -UP New Vo
(K ? ) (V DC )
Δ Vo%
Vo Decrease
R -DOWN New Vo
(K ? ) (V DC )
Figure 32. QMS Trim Schematic
With an external resistor ( R DOWN ) between the Trim pin
and –V OUT pin the output voltage set-point (Vo) decreases.
The following equation determines the required external
resistor value to obtain an adjusted output voltage:
1 1585 5.05
2 798 5.10
3 536 5.15
4 404 5.20
5 326 5.25
6 273 5.30
7 236 5.35
8 207 5.40
9 186 5.45
10 168 5.50
1 501 4.95
2 245 4.90
3 160 4.85
4 118 4.80
5 92 4.75
6 75 4.70
7 63 4.65
8 54 4.60
9 47 4.55
10 41 4.50
R DOWN ? ?
? 10 . 22 ? ? ??
? 511
? ? Vo %
?
?
Figure 34. QMS14DG Trim Characteristics
MCD10143 Rev.1.1, 30--Aug-10
Page 14 of 20
www.power-one.com
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