參數(shù)資料
型號： TPS40132RHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 40 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32
封裝： GREEN, PLASTIC, QFN-32
文件頁數(shù)： 7/40頁
文件大小： 1032K
代理商： TPS40132RHBR
www.ti.com
INDUCTOR DCR CURRENT SENSE
R1
L1
DCR
C1
To CSRTx
To CSx
VOUT
VIN
+
VC
L
R1
DCR
C1
=
(11)
V
C + VIN * VOUT
V
OUT
R1
C1
f
SW
V
IN
) IOC
DCR
(12)
R1
L1
DCR
C1
To CSRTx
To CSx
R2
VOUT
VIN
+
VC
SLUS776A – DECEMBER 2007 – REVISED FEBRUARY 2008
The preferred method for sampling the output current for the TPS40132 is known as the inductor DCR method.
This is a lossless approach, as opposed to using a discrete current sense resistor which occupies board area
and impacts efficiency as well. The inductor DCR implementation is shown in Figure 5.
Figure 5. Inductor DCR Current Sense Approach
The inductor L1 consists of inductance, L, and resistance, DCR. The time constant of the inductor: L / DCR
should equal the R1
×C1 time constant. Then choosing a value for C1 (0.1 F is a good choice) solving for R1 is
shown in Equation 11.
The voltage into the current sense amplifier of the controller , VC, is calculated in Equation 12.
As the DC load increases the majority of the voltage, VC, is determined by (IOC ×DCR), where IOC is the per
phase DC output current. It is important that at the overcurrent set point that the peak voltage of VC does not
exceed 60 mV, the maximum differential input voltage. If the voltage VC exceeds 60 mV, a resistor, R2, can be
added in parallel with C1 as shown in Figure 6. Adding R2 reduces the equivalent inductor DCR by the ratio
shown in Equation 14
Figure 6. Using Resistor R2 to Reduce the Current Sense Amplifier Voltage
The parallel combination of R1 and R2 is shown in Equation 13.
Copyright 2007–2008, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS40132
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40132RHBRG4 功能描述:DC/DC 開關(guān)控制器 2Ch Multiphase 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
TPS40132RHBT 功能描述:DC/DC 開關(guān)控制器 2Ch Multiphase 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
TPS40132RHBTG4 功能描述:DC/DC 開關(guān)控制器 2Ch Multiphase 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
TPS40-14 制造商:TOTAL-POWER 制造商全稱:TOTAL-POWER 功能描述:40 WATT OPEN - FRAME SWITCHING POWER SUPPLY
TPS40140 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL OR 2-PHASE, STACKABLE CONTROLLER
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