參數(shù)資料
型號(hào)： PTH04T231WAST
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： DIP-10
文件頁數(shù)： 15/36頁
文件大?。?/td> 1160K
代理商： PTH04T231WAST
UNDERVOLTAGE LOCKOUT (UVLO)
R
UVLO +
68.54 * VTHD
V
THD * 2.07
kW
(5)
GND
2
3
+
GND
Inhibit/
UVLO
10
VI
CI
UDG06059
PTH04T230/231W
RUVLO
SLTS271C – SEPTEMBER 2006 – REVISED MARCH 2009 ............................................................................................................................................. www.ti.com
The PTH04T230/231W 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 power-up 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 PTH04T230/231W module allows for limited adjustment of the ON threshold voltage.
The adjustment is made via the Inhbit/UVLO Prog control pin (pin 10) using a single resistor (see figure below).
When pin 10 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 (k)
154
71.5
53.6
33.2
26.7
Figure 18. Undervoltage Lockout
22
Copyright 2006–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH04T230W PTH04T231W
相關(guān)PDF資料
PDF描述
PTH04T230WAST 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T231WAD 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T230WAZT 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T231WAZT 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH04T230WAD 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PTH04T231WAZ 功能描述:DC/DC轉(zhuǎn)換器 6A 2.2V-5.5Vin Non- Iso 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(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:
PTH04T231WAZT 功能描述:DC/DC轉(zhuǎn)換器 6A 2.2V-5.5Vin Non- Iso 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(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:
PTH04T240F 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED POWER MODULE FOR 3-GHz DSP SYSTEMS
PTH04T240F_10 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED POWER MODULE FOR 3-GHz DSP SYSTEMS
PTH04T240FAD 功能描述:DC/DC轉(zhuǎn)換器 10A,2.2V-5.5V Inp 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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