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參數(shù)資料
型號(hào)： TPS54040DGQ
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, MSOP-10
文件頁(yè)數(shù)： 7/47頁(yè)
文件大小： 2435K
代理商： TPS54040DGQ
Adjusting the Output Voltage
Vout
0.8V
R1 = R2
0.8 V
-
÷
è
(1)
Enable and Adjusting Undervoltage Lockout
EN
VIN
+
-
TPS54040
R 1
R 2
Ihys
I1
0.9 A
m
1.25V
2.9 A
m
START
STOP
HYS
V
R1
I
-
=
(2)
ENA
START
ENA
1
V
R2
V
I
R1
=
-
+
(3)
www.ti.com................................................................................................................................................................................................... SLVS918 – MARCH 2009
DETAILED DESCRIPTION (continued)
The output voltage is set with a resistor divider from the output node to the VSENSE pin. It is recommended to
use 1% tolerance or better divider resistors. Start with a 10 k
for the R2 resistor and use the Equation 1 to
calculate R1. To improve efficiency at light loads consider using larger value resistors. If the values are too high
the regulator will be more susceptible to noise and voltage errors from the VSENSE input current will be
noticeable
The TPS54040 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 28 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
0.9
A that provides the default condition of the TPS54040 operating when the EN pin floats. Once the EN pin
voltage exceeds 1.25V, an additional 2.9
A 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 28. Adjustable Undervoltage Lockout (UVLO)
Another technique to add input voltage hysteresis is shown in Figure 29. 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.
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s): TPS54040
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54040DGQ 制造商:Texas Instruments 功能描述:Power Management IC 制造商:Texas Instruments 功能描述:IC, STEP-DOWN CONVERTER, MSOP-10
TPS54040DGQR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.5V-42Vin,0.5A Step Down SWIFT Convrtr 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
TPS54040EVM-456 功能描述:電源管理IC開(kāi)發(fā)工具 0.5A,12-42V In SWIFT Cnvrtr 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
TPS54040EVM-456 制造商:Texas Instruments 功能描述:EVALUATION MODULE FOR TPS54040 SWIFT(TM)
TPS54040-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:0.5-A 42-V STEP-DOWN SWIFTa?￠ DC/DC CONVERTER WITH Eco-modea?￠
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