參數(shù)資料
型號(hào)： TPS65072TRSLRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PQCC48
封裝： 6 X 6 MM, 0.4 MM PITCH, PLASTIC, QFN-48
文件頁數(shù)： 25/90頁
文件大?。?/td> 1375K
代理商： TPS65072TRSLRQ1
www.ti.com
SLVSAP7 – JANUARY 2011
During the Power Save Mode the output voltage is monitored with a PFM comparator. As the output voltage falls
below the PFM comparator threshold of VOUTnominal +1%, the device starts a PFM pulse. For this the High Side
MOSFET switch will turn on and the inductor current ramps up. Then it will be turned off and the Low Side
MOSFET switch will be turned on until the inductor current becomes 0.
The converter effectively delivers a current to the output capacitor and the load. If the load is below the delivered
current the output voltage will rise. If the output voltage is equal or higher than the PFM comparator threshold,
the device stops switching and enters a sleep mode with typical 15mA current consumption.
In case the output voltage is still below the PFM comparator threshold, further PFM current pulses will be
generated until the PFM comparator threshold is reached. The converter starts switching again once the output
voltage drops below the PFM comparator threshold.
With a single threshold comparator, the output voltage ripple during PFM Mode operation can be kept very small.
The ripple voltage depends on the PFM comparator delay, the size of the output capacitor and the inductor
value. Increasing output capacitor values and/or inductor values will minimize the output ripple.
The PFM Mode is left and PWM Mode entered in case the output current can not longer be supported in PFM
Mode or if the output voltage falls below a second threshold, called PFM comparator low threshold. This PFM
comparator low threshold is set to –1% below nominal Vout, and enables a fast transition from Power Save
Mode to PWM Mode during a load step. In Power Save Mode the quiescent current is reduced typically to 15mA.
The Power Save Mode can be disabled through the I2C interface for each of the step-down converters
independent from each other. If Power Save Mode is disabled, the converter will then operate in fixed PWM
mode.
Dynamic Voltage Positioning
This feature reduces the voltage under/overshoots at load steps from light to heavy load and vice versa. It is
active in Power Save Mode. It provides more headroom for both the voltage drop at a load step, and the voltage
increase at a load throw-off. This improves load transient behavior. At light loads, in which the converter operates
in PFM Mode, the output voltage is regulated typically 1% higher than the nominal value. In case of a load
transient from light load to heavy load, the output voltage drops until it reaches the PFM comparator low
threshold set to –1% below the nominal value and enters PWM mode. During a load throw off from heavy load to
light load, the voltage overshoot is also minimized due to active regulation turning on the Low Side MOSFET
switch.
Figure 30. Power Save Mode
100% Duty Cycle Low Dropout Operation
The device starts to enter 100% duty cycle Mode once the input voltage comes close the nominal output voltage.
In order to maintain the output voltage, the High Side MOSFET switch is turned on 100% for one or more cycles.
With further decreasing VIN the High Side MOSFET switch is turned on completely. In this case the converter
offers a low input-to-output voltage difference. This is particularly useful in battery-powered applications to
achieve longest operation time by taking full advantage of the whole battery voltage range.
The minimum input voltage to maintain regulation depends on the load current and output voltage, and can be
calculated as:
Vinmin = Voutmax + Ioutmax × (RDSonmax + RL)
(3)
With:
Copyright 2011, Texas Instruments Incorporated
31
相關(guān)PDF資料
PDF描述
TC151B4217EOA723 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
TC151B2419EOA713 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
TC151A5721EOA723 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
TC151B1528EOA723 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
TC151B5830EOA723 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS650731EVM-430 功能描述:電源管理IC開發(fā)工具 TPS650731 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
TPS650731RSLR 功能描述:PMIC 解決方案 5Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
TPS650731RSLT 功能描述:PMIC 解決方案 5Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
TPS650732EVM-430 功能描述:電源管理IC開發(fā)工具 TPS650732 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
TPS650732RSLR 功能描述:PMIC 解決方案 5Ch Pwr Mgmt IC RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*