參數(shù)資料
型號(hào)： TPS51221RTVRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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(yè)數(shù)： 19/39頁(yè)
文件大?。?/td> 829K
代理商： TPS51221RTVRG4
APPLICATION INFORMATION
EXTERNAL PARTS SELECTION
R1
+
1.0V
+
R2
VFB
PWM
SwitchingModulator
Co
Lx
VIN
Rs
+
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
ESR
RL
+
Rgc
Rgv
Cc
Gmv
COMP
VREF
Gmc
+
2.0V
Voltagedivider
Error Amplifier
Ramp
comp.
+
R1 + VOUT * 1.0
R2
(7)
RF[kW] +
1
105
sw [kHz]
(8)
L +
1
0.33
I
OUT(MAX)
SW
V
IN(TYP) * VOUT
V
OUT
V
IN(TYP)
(9)
R
SENSE +
V
OCL
I
OCL(PEAK)
(10)
SLVS786A – NOVEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
A buck converter using TPS51221 consists of linear circuits and a switching modulator. Figure 42 shows basic
scheme.
Figure 42. Simplified Current Mode Functional Blocks
The external components can be selected by following manner.
1. Determine output voltage dividing resistors (R1 and R2: shown in Figure 42) using the next equation
2. Determine switching frequency. Higher frequency allows smaller output capacitances; however, efficiency
is degraded due to increase of switching loss. Frequency setting resistor for RF-pin can be calculated by;
3. Choose the inductor. The inductance value should be determined to give the ripple current of
approximately 25% to 50% of maximum output current. Recommended ripple current rate is about 30% to
40% at the typical input voltage condition. The next equation uses 33%.
The inductor also needs to have low DCR to achieve good efficiency, as well as enough room above peak
inductor current before saturation.
4. Determine the OCL trip voltage threshold, VOCL, and select the sensing resistor. The OCL trip voltage
threshold is determined by TRIP pin setting. Using a larger value improves the S/N ratio. Determine the
sensing resistor using next equation. IOCL(PEAK) should be approximately 1.5 × IOUT(MAX) to 1.7 × IOUT(MAX).
26
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(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
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(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
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(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
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(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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