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參數資料
| 型號： | TPS54328DDA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.7 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012BA, SOP-8 |
| 文件頁數： | 4/19頁 |
| 文件大小： | 497K |
| 代理商： | TPS54328DDA |
V
= 0.765 x
OUT
R1
1 +
R2
÷
÷
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F
=
P
OUT
1
2
L
x C
p
SLVSAN2 – NOVEMBER 2010
www.ti.com
DESIGN GUIDE
Step By Step Design Procedure
To begin the design process, you must know a few application parameters:
Input voltage range
Output voltage
Output current
Output voltage ripple
Input voltage ripple
Figure 15. Shows the schematic diagram for this design example.
Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the VFB pin. It is recommended to use
To improve efficiency at very light loads consider using larger value resistors, too high of resistance will be more
susceptible to noise and voltage errors from the VFB input current will be more noticeable.
(3)
Output Filter Selection
The output filter used with the TPS54328 is an LC circuit. This LC filter has double pole at:
(4)
At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal
gain of the TPS54328. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls
off at a –40 dB per decade rate and the phase drops rapidly. D-CAP2 introduces a high frequency zero that
reduces the gain roll off to –20 dB per decade and increases the phase to 90 degrees one decade above the
zero frequency. The inductor and capacitor selected for the output filter must be selected so that the double pole
of Equation 4 is located below the high frequency zero but close enough that the phase boost provided be the
high frequency zero provides adequate phase margin for a stable circuit. To meet this requirement use the
values recommended in Table 1
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS54328
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相關代理商/技術參數 |
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| TPS54328DDAR | 功能描述:直流/直流開關轉換器 4.5V-18Vin,3A Synch Step-Down SWIFT RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54328DRCR | 功能描述:直流/直流開關轉換器 4.5V-18V Inp 3A Sync SD DCAP Md Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54328DRCT | 功能描述:直流/直流開關轉換器 4.5V-18V Inp 3A Sync SD DCAP Md Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54328EVM-686 | 功能描述:電源管理IC開發(fā)工具 TPS54328 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54329 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 18V Input, 3-A SYNCHRONOUS STEP DOWN CONVERTER |
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