參數(shù)資料
型號(hào)： TPS40071PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 2/28頁(yè)
文件大小： 655K
代理商： TPS40071PWPR
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RKFF Feedforward Impedance k
V
U
V
L
O
Programmable
UVLO
Threshold
V
UVLOVON
fSW = 500 kHz
UVLOVOFF
40
60
100
120
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2
8
6
10
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12
18
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RKFF Feedforward Impedance k
V
U
V
L
O
Programmable
UVLO
Threshold
V
UVLOVON
fSW = 750 kHz
UVLOVOFF
SLUS582J – DECEMBER 2003 – REVISED APRIL 2009 .................................................................................................................................................. www.ti.com
UNDERVOLTAGE LOCKOUT THRESHOLD
vs
FEEDFORWARD IMPEDANCE
Figure 6.
Figure 7.
The programmable UVLO circuit incorporates 20% hysteresis from the start voltage to the shutdown voltage. For
example, if the startup voltage is programmed to be 10 V, the controller starts when VDD reaches 10 V and shuts
down when VDD falls below 8 V. The maximum duty cycle begins to decrease as the input voltage rises to twice
the startup voltage. Below this point, the maximum duty cycle is as specified in the electrical table. Note that with
this scheme, the theoretical maximum output voltage that the converter can produce is approximately two times
the programmed startup voltage. For design, set the programmed startup voltage equal to or greater than the
desired output voltage divided by maximum duty cycle (85% for frequencies 500 kHz and below). For example, a
5-V output converter should not have a programmed startup voltage below 5.9 V. Figure 8 shows the theoretical
maximum duty cycle (typical) for various programmed startup voltages
At startup, LDRV may pulse high when VDD is in the range of 1 V to 1.25 V and VDD is rising extremely slowly. To
minimize these effects, the ramp rate of VDD at startup should be greater than 1 V/ms.
10
Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS40070 TPS40071
相關(guān)PDF資料
PDF描述
TPS40070PWPR 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40071PWPRG4 功能描述:DC/DC 開關(guān)控制器 Mid Rg In Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40074 制造商:TI 制造商全稱:Texas Instruments 功能描述:MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
TPS40074EVM-001 功能描述:電源管理IC開發(fā)工具 TPS40074 001 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
TPS40074RHLR 功能描述:DC/DC 開關(guān)控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40074RHLRG4 功能描述:DC/DC 開關(guān)控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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