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| 型号： | TPS40132RHBT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 40 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | GREEN, PLASTIC, QFN-32 |
| 文件页数： | 7/40页 |
| 文件大小： | 1032K |
| 代理商： | TPS40132RHBT |
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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.
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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相关代理商/技术参数 |
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| TPS40132RHBTG4 | 功能描述:DC/DC 开关控制器 2Ch Multiphase Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40-14 | 制造商:TOTAL-POWER 制造商全称:TOTAL-POWER 功能描述:40 WATT OPEN - FRAME SWITCHING POWER SUPPLY |
| TPS40140 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL OR 2-PHASE, STACKABLE CONTROLLER |
| TPS40140EVM-002 | 功能描述:电源管理IC开发工具 HEADPHONE DRIVER RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS40140EVM-003 | 功能描述:电源管理IC开发工具 32A Sgl Output 2-Ph Buck Conv Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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