參數(shù)資料
型號(hào)： TPS51220ARTVR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, PLASTIC, QFN-32
文件頁(yè)數(shù)： 26/53頁(yè)
文件大?。?/td> 1380K
代理商： TPS51220ARTVR
Co
Lx
VIN
Rs(DCR)
+
Cx
Rx
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
Inductor
Co
Lx
VIN
Rs(DCR)
+
Cx
Rx
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
Inductor
Rc
(
)
Lx
Cx ×
Rx//Rc
=
Rs
I
OCL(PEAK) + VOCL
1
Rs
Rx ) Rc
Rc
SLUS897D – DECEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
INDUCTOR DCR CURRENT SENSING
To use inductor DCR as current sensing resistor (Rs), the configuration needs to change as below. However, the
equation that must be satisfied is the same as the one for the resistor sensing.
Figure 48. Inductor DCR Current Sensing
Figure 49. Inductor DCR Current Sensing With Voltage Divider
TPS51220A has fixed V(OCL) point (60 mV or 31 mV). In order to adjust for DCR, a voltage divider can be
configured a described in Figure 49.
For Rx, Rc and Cx can be calculated as shown below, and overcurrent limitation value can be calculated as
follows:
(19)
(20)
Figure 50 shows the compensation technique for the temperature drifts of the inductor DCR value. This scheme
assumes the temperature rise at the thermistor (RNTC) is directly proportional to the temperature rise at the
inductor.
32
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51220A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51220ARTVT 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51220ARTVT 制造商:Texas Instruments 功能描述:Controller IC
TPS51220ATRTVRQ1 功能描述:電流型 PWM 控制器 Current-Mode NB Sys Pwr Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51220EVM 功能描述:電源管理IC開(kāi)發(fā)工具 TPS51220EVM Hi Perf Synch Buck 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
TPS51220RHBR 功能描述:電流型 PWM 控制器 Fixed Freq 99% Duty Cycle Peak Current RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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