參數(shù)資料
型號(hào)： PTV08T250WAD
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 9/30頁(yè)
文件大?。?/td> 795K
代理商： PTV08T250WAD
ADJUSTING THE OUTPUT VOLTAGE OF THE PTV08T250W WIDE-OUTPUT ADJUST POWER
)
V
-0.8
O
0.8
-7.135kW
(
R
=30.1
SET
x
(4)
PTV08T250W
R
1%
0.05W
SET
10
17
3
12 18 19 4 5 11
1
2
VO
C 2
O
C 1
O
GND
VOAdj
8
+Sense
-Sense
GND
www.ti.com .......................................................................................................................................... SLTS260E – OCTOBER 2005 – REVISED NOVEMBER 2008
MODULE
The VO Adjust control (pin 8) sets the output voltage of the PTV08T250W product. The adjustment range is from
0.8 V to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be
connected directly between the VO Adjust and GND pins. Table 5 gives the preferred value of the external
resistor for a number of standard voltages, along with the actual output voltage that this resistance value
provides.
For other output voltages, the value of the required resistor can either be calculated using Equation 4, or by
selecting from the range of values given in Table 6. Figure 17 shows the placement of the required resistor.
Table 5. Standard Values of RSET for Common Output
Voltages
PTV08T250W
VO (Required)
RSET
VO (Actual)
3.3 V
2.49 k
3.303 V
2.5 V
6.98 k
2.5 V
2.0 V
13.0 k
1.997 V
1.8 V
16.9 k
1.796 V
1.5 V
27.4 k
1.498 V
1.2 V
53.6 k
1.202 V
1.0 V
113 k
1 V
0.8 V
Open
0.8 V
Figure 17. VO Adjust Resistor Placement
A 0.05-W rated resistor may be used. The tolerance should be 1%, and the temperature stability, 100 ppm/°C
(or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pin 8
and nearest GND pin (pin 11) using dedicated PCB traces.
Never connect capacitors from V
O Adjust to either GND or VO. Any capacitance added to the VO Adjust pin
affects the stability of the regulator.
Copyright 2005–2008, Texas Instruments Incorporated
17
Product Folder Link(s): PTV08T250W
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