參數(shù)資料
型號(hào)： TPS51221RTVRG4
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, GREEN, PLASTIC, QFN-32
文件頁數(shù)： 21/39頁
文件大?。?/td> 829K
代理商： TPS51221RTVRG4
INDUCTOR DCR CURRENT SENSING
Co
Lx
Rs(DCR)
+
Cx
Rx
CSP
CSN
Inductor
Rc1
Rc2
R
NTC
Co
Lx
VIN
Rs(DCR)
+
Cx
Rx
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
Inductor
Rc
Cx
Rx
Rc +
Lx
Rs
(17)
I
OCL(PEAK) + VOCL
1
Rs
Rx ) Rc
Rc
(18)
SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
To use an inductor DCR as current sensing resistor (Rs), the configuration needs to change, as shown in
Figure 44. However, the equation must be satisfied the same as the one using resistor sensing.
Figure 44. Inductor DCR Current Sensing
Figure 45. Inductor DCR Current Sensing With Voltage Divider
The TPS51221 has a fixed VOCL point (60 mV or 30 mV). In order to adjust for DCR, a voltage divider can be
configured as shown in Figure 45.
For Rx, Rc and Cx can be determined as below, and over-current limitation value can be calculated as follows.
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.
28
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51221
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51221RTVT 功能描述:電流型 PWM 控制器 Fixed Freq Notebook Sys Pwr Dual Cntrlr RoHS:否 制造商:Texas Instruments 開關(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
TPS51221RTVTG4 功能描述:電流型 PWM 控制器 Fixed Freq Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開關(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
TPS51222 制造商:TI 制造商全稱:Texas Instruments 功能描述:Fixed Frequency, 99% Duty Cycle Peak Current Mode Notebook System Power Controller
TPS51222RTVR 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開關(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
TPS51222RTVT 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Cntrlr RoHS:否 制造商:Texas Instruments 開關(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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