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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 |
| 文件頁數(shù)： | 25/53頁 |
| 文件大小： | 1380K |
| 代理商： | TPS51220ARTVR |
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Time
VFB
signal
VFB
RIPPLE
=Vo
x1/Vout
30mV
t
=1/f
SW
Cc + Co
ESR
Rgv
Cx
Rx +
Lx
Rs
Co
L
VIN
Rs
+
Cx
Rx
Control
logic
&
Driver
DRVH
DRVL
CSP
CSN
Ex-resistor
Lx(ESL)
www.ti.com
SLUS897D – DECEMBER 2008 – REVISED FEBRUARY 2010
Figure 46. Required voltage feedback ramp signal
7. Calculate Cc. The purpose of this capacitance is to cancel zero caused by ESR of the output capacitor. If
ceramic capacitor(s) is used, there is no need for Cc. If a combination of different capacitors is used, attach a
RC network circuit instead of single capacitance to cancel zeros and poles caused by the output capacitors.
With single capacitance, Cc is given in Equation 17.
(17)
For D-CAP mode, basically Cc is not needed.
8. Choose MOSFETs Generally, the on resistance affects efficiency at high load conditions as conduction loss.
For a low output voltage application, the duty ratio is not high enough so that the on resistance of high-side
MOSFET does not affect efficiency; however, switching speed (tr and tf) affects efficiency as switching loss.
As for low-side MOSFET, the switching loss is usually not a main portion of the total loss.
RESISTOR CURRENT SENSING
For more accurate current sensing with an external resistor, the following technique is recommended. Adding an
RC filter to cancel the parasitic inductance of resistor, this filter value is calculated using Equation 18.
(18)
This equation means time-constant of Cx and Rx should match the one of Lx (ESL) and Rs.
Figure 47. External Resistor Current Sensing
Copyright 2008–2010, Texas Instruments Incorporated
31
Product Folder Link(s) :TPS51220A
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| TPS51220ARTVT | 制造商:Texas Instruments 功能描述:Controller IC |
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| TPS51220EVM | 功能描述:電源管理IC開發(fā)工具 TPS51220EVM Hi Perf Synch Buck RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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