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參數資料
| 型號： | TPS62273DRVR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.84 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.80 MM HEIGHT, GREEN, PLASTIC, SON-6 |
| 文件頁數： | 7/24頁 |
| 文件大?。?/td> | 882K |
| 代理商： | TPS62273DRVR |
APPLICATION INFORMATION
VIN
GND
EN
FB
TPS62270DRV
VSEL
L
2.2 H
m
SW
C
10 F
OUT
m
0.9V
1.15V
V
0.9V/1.15V
upto400mA
OUT
V
=2Vto6V
IN
C
4.7 F
IN
m
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
Inductor Selection
DIL + Vout
1 *
Vout
Vin
L
(1)
I
Lmax + Ioutmax )
DIL
2
(2)
www.ti.com ........................................................................................................................................... SLVS799C – NOVEMBER 2007 – REVISED JANUARY 2009
Figure 25. TPS62270DRV Application Circuit
The TPS62270 is designed to operate with inductors in the range of 1.5
H to 4.7H and with output capacitors in
the range of 4.7
F to 22F. The part is optimized for operation with a 2.2H inductor and 10F output capacitor.
Larger or smaller inductor values can be used to optimize the performance of the device for specific operation
conditions. For stable operation, the L and C values of the output filter may not fall below 1
H effective
inductance and 3.5
F effective capacitance.
The inductor value has a direct effect on the ripple current. The selected inductor has to be rated for its dc
resistance and saturation current. The inductor ripple current (
ΔIL) decreases with higher inductance and
increases with higher VI or VO.
The inductor selection has also impact on the output voltage ripple in PFM mode. Higher inductor values will lead
to lower output voltage ripple and higher PFM frequency, lower inductor values will lead to a higher output
voltage ripple but lower PFM frequency.
Equation 1 calculates the maximum inductor current under static load conditions. The saturation current of the
inductor should be rated higher than the maximum inductor current as calculated with Equation 2. This is
recommended because during heavy load transient the inductor current will rise above the calculated value.
With:
f = Switching Frequency (2.25 MHz typical)
L = Inductor Value
ΔIL = Peak to Peak inductor ripple current
ILmax = Maximum Inductor current
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
corresponding converter.
Accepting larger values of ripple current allows the use of low inductance values, but results in higher output
voltage ripple, greater core losses, and lower output current capability.
The total losses of the coil have a strong impact on the efficiency of the DC/DC conversion and consist of both
the losses in the dc resistance (R(DC)) and the following frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
Copyright 2007–2009, Texas Instruments Incorporated
15
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相關代理商/技術參數 |
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| TPS62273DRVRG4 | 功能描述:直流/直流開關調節器 2.25MHz 400mA Step- Down Cnvrtr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62273DRVT | 功能描述:直流/直流開關調節器 2.25MHz 400mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62273DRVTG4 | 功能描述:直流/直流開關調節器 2.25MHz 400mA Step- Down Cnvrtr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62290DRVR | 功能描述:直流/直流開關調節器 2.25MHz 1A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62290DRVRG4 | 功能描述:直流/直流開關調節器 2.25MHz 1A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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