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參數(shù)資料
| 型號： | TPS40050PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 16/36頁 |
| 文件大?。?/td> | 648K |
| 代理商： | TPS40050PWPRG4 |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
23
DESIGN EXAMPLE
D Input Voltage: 10 Vdc to 24 Vdc
D Output voltage: 3.3 V ±2% (3.234 ≤ VO ≤ 3.366)
D Output current: 8 A (maximum, steady state), 10 A (surge, 10 ms duration, 10% duty cycle maximum)
D Output ripple: 33 mVP-P at 8 A
D Output load response: 0.3 V => 10% to 90% step load change, from 1 A to 7 A
D Operating temperature: 40°C to 85°C
D fSW=300 kHz
1. Calculate maximum and minimum duty cycles
d
MIN +
V
O(min)
V
IN(max)
+ 3.324
24
+ 0.135
d
MAX +
V
O(max)
V
IN(min)
+ 3.366
10
+ 0.337
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 Electrical Characteristics table). Therefore
V
O(min)
V
IN(max)
+
t
ON
T
SW
or
1
T
SW
+ f
SW +
V
O(min)
V
IN(max)
T
ON
Using 400 ns to provide margin,
f
SW +
0.135
400 ns
+ 337 kHz
Since the oscillator can vary by 10%, decrease fSW, by 10%
f
SW + 0.9
337 kHz
+ 303 kHz
and therefore choose a frequency of 300 kHz.
3. Select
I
In this case
I is chosen so that the converter enters discontinuous mode at 20% of nominal load.
DI + I
O
2
0.2
+ 8
2
0.2
+ 3.2 A
(46)
(47)
(48)
(49)
(50)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TPS40050-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40050QPWPRQ1 | 功能描述:DC/DC 開關(guān)控制器 Auto Cat Wide-Input Synch Buck 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 |
| TPS40051 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) |
| TPS40051EVM-001 | 制造商:Texas Instruments 功能描述:TPS40051EVM-001 - Bulk |
| TPS40051EVM-002 | 制造商:Texas Instruments 功能描述:TPS40051EVM-002 - Bulk |
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