參數(shù)資料
型號(hào)： TPS54240DGQ
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 6/48頁(yè)
文件大?。?/td> 1759K
代理商： TPS54240DGQ
Vout
0.8V
R1 = R2
0.8 V
-
÷
è
EN
VIN
+
-
TPS54240
R 1
R 2
Ihys
I1
0.9 A
m
1.25V
2.9 A
m
START
STOP
HYS
V
R1
I
-
=
ENA
START
ENA
1
V
R2
V
I
R1
=
-
+
EN
Ihys
VIN
+
-
TPS54240
R 1
R 2
VOUT
R3
I1
0.9 A
m
2.9 A
m
1.25V
SLVSAA6 – APRIL 2010
www.ti.com
DETAILED DESCRIPTION (continued)
(1)
Enable and Adjusting Undervoltage Lockout
The TPS54240 is disabled when the VIN pin voltage falls below 2.5 V. If an application requires a higher
undervoltage lockout (UVLO), use the EN pin as shown in Figure 27 to adjust the input voltage UVLO by using
the two external resistors. Though it is not necessary to use the UVLO adjust registers, for operation it is highly
recommended to provide consistent power up behavior. The EN pin has an internal pull-up current source, I1, of
0.9mA that provides the default condition of the TPS54240 operating when the EN pin floats. Once the EN pin
voltage exceeds 1.25V, an additional 2.9mA of hysteresis, Ihys, is added. This additional current facilitates input
voltage hysteresis. Use Equation 2 to set the external hysteresis for the input voltage. Use Equation 3 to set the
input start voltage.
Figure 27. Adjustable Undervoltage Lockout (UVLO)
(2)
(3)
Another technique to add input voltage hysteresis is shown in Figure 28. This method may be used, if the
resistance values are high from the previous method and a wider voltage hysteresis is needed. The resistor R3
sources additional hysteresis current into the EN pin.
Figure 28. Adding Additional Hysteresis
14
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54240
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54240DGQ 制造商:Texas Instruments 功能描述:IC STEP-DOWN DC/DC CONVERTER MSOP-10
TPS54240DGQR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.5-42V Inp,2.5A,2.5 MHz SWIFT Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS54240DRCR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3.5-42Vin,2.5A SD Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54240DRCT 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3.5-42Vin,2.5A SD Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54240EVM-605 功能描述:電源管理IC開(kāi)發(fā)工具 2.5A SWIFT Converter Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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