參數(shù)資料
型號： PTH08T250WAS
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
文件頁數(shù)： 39/39頁
文件大小： 2220K
代理商： PTH08T250WAS
SET
O
0.7
R
30.1 (k
)
6.49 (k
)
V
0.7
=
W
-
W
÷
-
è
+Sense
V
O
-Sense
GND
V
O
Adj
PTH08T250W
10
17
11
16
13
4
18
12
9
8
V
O
GND GND GND
AGND
R
SET
1%
0.05 W
C
O
+
+Sense
V
O
-Sense
GND
UDG-07049
www.ti.com
SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
The Vo Adjust control sets the output voltage of the PTH08T250W. The adjustment range of the PTH08T250W is
0.7 V to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be
connected directly between pins Vo Adjust (pin 18) and AGND (pin 4). Table 1 gives the standard 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 the following formula,
or simply selected from the range of values given in Table 2. Figure 11 shows the placement of the required
resistor.
(1)
Table 1. Standard Values of RSET for Standard Output Voltages
VO (Standard) (V)
RSET (Standard Value) (k)
VO (Actual) (V)
3.3
1.62
3.298
2.5
5.23
2.498
2.0
9.76
1.997
1.8
12.7
1.798
1.5
19.6
1.508
1.2
35.7
1.199
1.0 (1)
63.4
1.001
0.7 (1)
Open
0.700
(1)
The maximum input voltage is duty cycle limited to (VO × 12) or 14 volts, whichever is less. The
maximum allowable input voltage is a function of switching frequency, and may increase or decrease
when the SmartSync feature is utilized. Please review the SmartSync section of the Application
Information for further guidance.
(1)
RSET: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/°C (or better). Connect the
resistor directly between pins 18 and 4, as close to the regulator as possible, using dedicated PCB traces.
(2)
Never connect capacitors from VO Adjust to either + Sense, GND, or VO. Any capacitance added to the VO Adjust pin
affects the stability of the regulator.
Figure 11. VO Adjust Resistor Placement
Copyright 2010–2009, Texas Instruments Incorporated
9
Product Folder Link(s): PTH08T250W
相關(guān)PDF資料
PDF描述
PTH08T250WAZ 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T255WAS DC-DC REG PWR SUPPLY MODULE
PTH08T255WAZ DC-DC REG PWR SUPPLY MODULE
PTH08T255WAZT DC-DC REG PWR SUPPLY MODULE
PTH08T255WAST DC-DC REG PWR SUPPLY MODULE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PTH08T250WAST 功能描述:DC/DC轉(zhuǎn)換器 50A 4.5V to 14V Inp Non-Isolated RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH08T250WAZ 功能描述:DC/DC轉(zhuǎn)換器 50A 4.5V to 14V Inp Non-Isolated RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH08T250WAZT 功能描述:DC/DC轉(zhuǎn)換器 50A 4.5V to 14V Inp Non-Isolated RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTH08T250WBD 制造商:Texas Instruments 功能描述:
PTH08T255WAD 功能描述:DC/DC轉(zhuǎn)換器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
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