參數(shù)資料
型號： TXS120ZY-P21V
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT 144 W DC-DC REG PWR SUPPLY MODULE
封裝： 2.400 X 3.450 INCH, 0.500 INCH HEIGHT, 3/4 BRICK PACKAGE-14
文件頁數(shù)： 5/27頁
文件大?。?/td> 2635K
代理商： TXS120ZY-P21V
Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
REV. FEB 18, 2003
13 of 27
www.power-one.com
Output Voltage Trimming
The Trim feature allows the user to adjust the
output voltage in the range 90 …110 % Uo nom.
The output voltage can either be adjusted using an
external resistor or with an external voltage source.
The adjust resistor should be connected close to
the unit. The voltage source should be connected
to sense (-).
Adjustment of
Uo with an external resistor
The trimming resistor needed to reach Uo Set can be
calculated using equations 1 and 2:
Increasing the output voltage:
To increase the output voltage a resistor should be
connected between pins 4 and 7 as indicated in
the figure below.
Vo (+)
Sense (+)
Trim
Sense (-)
Vo (-)
R Load
R TR - Up
Vi (+)
Vi (-)
ON/OFF
6
4
7
8
5
2
3
1
Figure 29:
Trim up
RTR - up [k] = 2.4k Uo/(Uo - Uo nom) – 17.6k
Decreasing the output voltage:
To decrease the output voltage a resistor should
be connected between pins 7 and 8 as indicated in
the figure below.
Vo (+)
Sense (+)
Trim
Sense (-)
Vo (-)
R Load
R TR - Down
Vi (+)
Vi (-)
ON/OFF
6
4
7
8
5
2
3
1
Figure 30:
Trim down
RTR - down [k] = 2.4k Uo/(Uo nom - Uo) – 17.6k
Example: RTR to trim up Uo to 106% is needed
RTR-up [k] = 2.4k Uo/(Uo - Uo nom) – 17.6k
RTR-up [k] = 2.4k 1.06/(1.06 – 1) – 17.6k
RTR-up [k] = 24.8k
Trim function controlled by an adjust resistor
88%
90%
92%
94%
96%
98%
100%
102%
104%
106%
108%
110%
112%
114%
116%
0.1
1
10
100
1000
Adjustment Resistor Value [kOhm]
%
of
Output
Vol
tage
Change
Radj connectet to Uo -
Radj connected to Uo+
Figure 31:
Trim with an external adjust resistor
Adjustment of
Uo with an external voltage
The required adjust voltage can be determined
using equation 3.
Vo (+)
Sense (+)
Trim
Sense (-)
Vo (-)
R Load
U TR
Vi (+)
Vi (-)
ON/OFF
6
4
7
8
5
2
3
1
+
Figure 32:
Trim up and down with an external
voltage source referenced to sense (-)
UTR [V] = (Uo – 0.88 Uo nom)/0.24
By connecting pin 7 to Vo (+), the output voltage is
set to 112 %. By connecting pin 7 to Vo (-), the
output voltage is set to 88 %.
Trim function controlled by an adjust voltage
88%
92%
96%
100%
104%
108%
112%
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Uadj / Uo(nom)
%
of
Output
Voltage
Change
Figure 33:
Trim with an external adjust voltage
Example: UTR to trim Uo of the TXS100ZB to 90 %
TXS100ZB Uo nom = 1.8 V
Uo = 0.9 1.8 V = 1.62 V
UTR = (1.62 – 1.584) / 0.24 = 0.15V
3)
1)
2)
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