參數(shù)資料
型號(hào)： TPS40131RHBR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32
封裝： GREEN, PLASTIC, QFN-32
文件頁(yè)數(shù)： 7/40頁(yè)
文件大?。?/td> 940K
代理商： TPS40131RHBR
www.ti.com
R1
L1
DCR
C1
To CSRTx
To CSx
VOUT
VIN
+
VC
R1 +
L1
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
R1 R2 +
L1
DCR
C1
(13)
R2
R1 ) R2
(14)
SLVS635 – FEBRUARY 2007
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 μF 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.
The ratio shown in Equation 14 provides the required voltage attenuation.
15
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TPS40131RHBRG4 功能描述:DC/DC 開關(guān)控制器 Two-Phase Synch Buck 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
TPS40131RHBT 功能描述:DC/DC 開關(guān)控制器 2-Ph Synch Buck Cntr 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
TPS40131RHBT 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, QFN-32
TPS40131RHBTG4 功能描述:DC/DC 開關(guān)控制器 Two-Phase Synch Buck 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
TPS40132 制造商:TI 制造商全稱:Texas Instruments 功能描述:TWO-PHASE, SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED MOSFET DRIVERS
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