參數(shù)資料
型號： 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
文件頁數(shù)： 9/47頁
文件大小： 2435K
代理商： TPS54040DGQ
Slow Start/Tracking Pin (SS/TR)
Tss(ms)
Iss( A)
Css(nF) =
Vref (V)
0.8
m
(6)
EN
SS/TR
V
SENSE
VOUT
Overload Recovery Circuit
www.ti.com................................................................................................................................................................................................... SLVS918 – MARCH 2009
DETAILED DESCRIPTION (continued)
The TPS54040 effectively uses the lower voltage of the internal voltage reference or the SS/TR pin voltage as
the power-supply's reference voltage and regulates the output accordingly. A capacitor on the SS/TR pin to
ground implements a slow start time. The TPS54040 has an internal pull-up current source of 2
A that charges
the external slow start capacitor. The calculations for the slow start time (10% to 90%) are shown in Equation 6.
The voltage reference (VREF) is 0.8 V and the slow start current (ISS) is 2A. The slow start capacitor should
remain lower than 0.47
F and greater than 0.47nF.
At power up, the TPS54040 will not start switching until the slow start pin is discharged to less than 40 mV to
ensure a proper power up, see Figure 30.
Also, during normal operation, the TPS54040 will stop switching and the SS/TR must be discharged to 40 mV,
when the VIN UVLO is exceeded, EN pin pulled below 1.25V, or a thermal shutdown event occurs.
The VSENSE voltage will follow the SS/TR pin voltage with a 45mV offset up to 85% of the internal voltage
reference. When the SS/TR voltage is greater than 85% on the internal reference voltage the offset increases as
the effective system reference transitions from the SS/TR voltage to the internal voltage reference (see
Figure 23). The SS/TR voltage will ramp linearly until clamped at 1.7V.
Figure 30. Operation of SS/TR Pin when Starting
The TPS54040 has an overload recovery (OLR) circuit. The OLR circuit will slow start the output from the
overload voltage to the nominal regulation voltage once the fault condition is removed. The OLR circuit will
discharge the SS/TR pin to a voltage slightly greater than the VSENSE pin voltage using an internal pull down of
100
A when the error amplifier is changed to a high voltage from a fault condition. When the fault condition is
removed, the output will slow start from the fault voltage to nominal output voltage.
Copyright 2009, Texas Instruments Incorporated
17
Product Folder Link(s): TPS54040
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相關代理商/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/直流開關轉(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 開關頻率: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 安裝風格:SMD/SMT
TPS54040EVM-456 功能描述:電源管理IC開發(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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