參數(shù)資料
型號： PTH04T241WAST
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
封裝： PLASTIC, DIP-11
文件頁數(shù)： 16/38頁
文件大?。?/td> 964K
代理商： PTH04T241WAST
UNDERVOLTAGE LOCKOUT (UVLO)
R
UVLO +
68.54 * VTHD
V
THD * 2.07
kW
(5)
Inhibit/
UVLO Prog
GND
PTH04T240W/241W
3
2
11
4
+
GND
VI
CI
RUVLO
VI
UDG06052
www.ti.com ...................................................................................................................................................... SLTS276D – OCTOBER 2006 – REVISED JULY 2009
The PTH04T240/241W power modules incorporate an input undervoltage lockout (UVLO). The UVLO feature
prevents the operation of the module until there is sufficient input voltage to produce a valid output voltage. This
enables the module to provide a clean, monotonic powerup for the load circuit, and also limits the magnitude of
current drawn from the regulator’s input source during the power-up sequence.
The UVLO characteristic is defined by the ON threshold (VTHD) voltage. Below the ON threshold, the Inhibit
control is overridden, and the module does not produce an output. The hysteresis voltage, which is the difference
between the ON and OFF threshold voltages, is set at 500 mV. The hysteresis prevents start-up oscillations,
which can occur if the input voltage droops slightly when the module begins drawing current from the input
source.
The UVLO feature of the PTH04T240/241W module allows for limited adjustment of the ON threshold voltage.
The adjustment is made via the Inhbit/UVLO Prog control pin (pin 11) using a single resistor (see Figure 18).
When pin 11 is left open circuit, the ON threshold voltage is internally set to its default value, which is 1.95 volts.
The ON threshold might need to be raised if the module is powered from a tightly regulated 5-V bus. Adjusting
the threshold prevents the module from operating if the input bus fails to completely rise to its specified
regulation voltage.
Equation 5 determines the value of RUVLO required to adjust VTHD to a new value. The default value is 1.95 V,
and it may only be adjusted to a higher value.
Table 7 lists the standard resistor values for RUVLO for different values of the on-threshold (VTHD) voltage.
Table 7. Standard RUVLO values for Various VTHD values
VTHD(V)
2.5
3.0
3.5
4.0
4.5
RUVLO (kΩ)
154
71.5
53.6
33.2
26.7
Figure 18. Undervoltage Lockout Adjustment Resistor Placement
Copyright 2006–2009, Texas Instruments Incorporated
23
Product Folder Link(s): PTH04T240W PTH04T241W
相關PDF資料
PDF描述
PTH04T240WAZT 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T240WAS 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T241WAZT 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T240WAZ 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T240WAST 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
相關代理商/技術參數(shù)
參數(shù)描述
PTH04T241WAZ 功能描述:DC/DC轉(zhuǎn)換器 10A 2.2V-5.5Vin Adj Pwr Module 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）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸:
PTH04T241WAZT 功能描述:DC/DC轉(zhuǎn)換器 10A 2.2V-5.5Vin Adj Pwr Module 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）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸:
PTH04T260W 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans⑩
PTH04T260WAD 功能描述:DC/DC轉(zhuǎn)換器 3A 2.2V-5.5Vin Adj Pwr Module 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）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸:
PTH04T260WAS 功能描述:DC/DC轉(zhuǎn)換器 3A 2.2V-5.5Vin Adj Pwr Module 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）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸:
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