參數(shù)資料
型號(hào)： TPS40200HD
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： PLASTIC, SOIC-8
文件頁(yè)數(shù)： 8/45頁(yè)
文件大?。?/td> 917K
代理商： TPS40200HD
2
F
2
F
1
F
ILIM
OC
R
V
=
I
+
SW
IN
O
f
V
C
f2
f1
R
f2
f1
R
+
÷
8
7
VDD
ISNS
R
ILIM
6
GDRV
V
IN
R
F1
R
F2
C
F
TPS40200
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
If necessary, a small R-C filter can be added to the current-sensing network to reduce nuisance tripping due to
noise pickup. This filter also can be used to trim the overcurrent trip point to a higher level with the addition of a
single resistor. See Figure 28. The nominal overcurrent trip point using the circuit of Figure 28 is described as:
(3)
Where:
IOC = Overcurrent trip point, peak current in the inductor
VILIM = Overcurrent threshold voltage for the TPS40200, typically 100 mV
RILIM = Value of the current sense resistor (in )
RF1 and RF2 = Values of the scaling resistors (in )
The value of the capacitor is determined by the nominal pulse width of the converter and the values of the
scaling resistors RF1 and RF2. It is best not to have the time constant of the filter longer than the nominal pulse
width of the converter, otherwise a substantial increase in the overcurrent trip point occurs. Using this constraint,
the capacitor value may be bounded by: .
(4)
Where:
Cf = Value of the current-limit filter capacitor (in F)
VO = Output voltage of the converter
VIN = Input voltage to the converter
fSW = Converter switching frequency
Rf1 and Rf2 = Values of the scaling resistors (in )
NOTE: The current-limit resistor and its associated circuitry can be eliminated and pins 7 and 8 shorted. However, the result
of this may result in damage to the part or PC board in the event of an overcurrent event.
Figure 28. Current-Limit Adjustment
16
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40200-HT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40200-HT 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER
TPS40200MDREP 功能描述:DC/DC 開關(guān)控制器 Mil Enhanced Nonsync Vltg-Mode Cntrlr 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
TPS40200MDREPG4 功能描述:電壓模式 PWM 控制器 EP DC/DC CONTROLLER RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
TPS40200-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER
TPS40200QDRQ1 功能描述:DC/DC 開關(guān)控制器 Wide-Inp-Rng Nonsync Vltg-Mode Cntrlr 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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