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| 型號： | TPS40055MPWPREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 15/35頁 |
| 文件大?。?/td> | 2348K |
| 代理商： | TPS40055MPWPREPG4 |
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SGLS310B – JULY 2005 – REVISED OCTOBER 2010
www.ti.com
DESIGN EXAMPLE
Input Voltage: 10 Vdc to 24 Vdc
Output voltage: 3.3 V +2% (3.234
≤ VO ≤ 3.366)
Output current: 8 A (maximum, steady state), 10 A (surge, 10-ms duration, 10% duty cycle maximum)
Output ripple: 33 mVP-P at 8 A
Output load response: 0.3 V => 10% to 90% step load change, from 1 A to 7 A
Operating temperature: -40°C to 85°C
fSW = 300 kHz
1. Calculate maximum and minimum duty cycles
(46)
2. Select switching frequency
The switching frequency is based on the minimum duty cycle ratio and the propagation delay of the current limit
comparator. In order to maintain current limit capability, the on time of the upper MOSFET (tON) must be greater
than 300 ns (see the Electrical Characteristics table). Therefore,
(47)
(48)
Using 400 ns to provide margin,
(49)
Since the oscillator can vary by 10%, decrease fSW by 10%
(50)
and therefore choose a frequency of 300 kHz.
3. Select
ΔI
In this case
ΔI is chosen so that the converter enters discontinuous mode at 20% of nominal load.
(51)
4. Calculate the power losses
Power losses in the high-side MOSFET (Si7860DP) at 24-VIN where switching losses dominate can be calculated
from Equation 52.
(52)
substituting Equation 34 into Equation 33 yields
(53)
22
Copyright 2005–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40055-EP
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| TPS40055PWP | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWPG4 | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWPR | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWPRG4 | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40056 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS, TRACKING BUCK CONTROLLER |
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