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參數(shù)資料
| 型號： | TPS62042DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1.2 A/1.25 MHZ, HIGH EFFICIENCY STEP DOWN CONVERTER |
| 中文描述： | 1.2 A/1.25兆赫，高效降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 372K |
| 代理商： | TPS62042DRC |
SLVS463A JUNE 2003 REVISED OCTOBER 2003
www.ti.com
14
Inductor Selection
The TPS6204x typically uses a 6.2-
μ
H output inductor. Larger or smaller inductor values can be used to optimize
the performance of the device for specific operation conditions. The selected inductor has to be rated for its dc
resistance and saturation current. The dc resistance of the inductance directly influences the efficiency of the
converter. Therefore an inductor with the lowest dc resistance should be selected for highest efficiency.
Formula (7) 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 formula (7). This is needed
because during heavy load transient the inductor current rises above the value calculated under (7).
IL
VO
1–
VO
VI
L
ILmax
IOmax
IL
2
with
= Switching frequency (1.25 MHz typical)
L = Inductor value
I
L
= Peak-to-peak inductor ripple current
I
L
max = Maximum inductor current
The highest inductor current occurs at maximum V
I
.
Open core inductors have a soft saturation characteristic and they can usually handle higher inductor currents versus
a comparable shielded inductor. A more conservative approach is to select the inductor current rating just for the
maximum switch current of 2.2 A for the TPS6204x. Keep in mind that the core material from inductor to inductor
differs and has an impact on the efficiency, especially at high switching frequencies. Refer to Table 1 and the typical
applications and inductors selection.
Table 1. Inductor Selection
INDUCTOR VALUE
4.7
μ
H
4.7
μ
H
5.3
μ
H
6.2
μ
H
6.0
μ
H
DIMENSIONS
COMPONENT SUPPLIER
Sumida CDRH4D28C-4.7
5,0 mm
×
5,0 mm
×
3,0 mm
5,2 mm
×
5,2 mm
×
2,5 mm
5,7 mm
×
5,7 mm
×
3,0 mm
5,7 mm
×
5,7 mm
×
3,0 mm
7,0 mm
×
7,0 mm
×
3,0 mm
Coiltronics SD25-4R7
Sumida CDRH5D28-5R3
Sumida CDRH5D28-6R2
Sumida CDRH6D28-6R0
(6)
(7)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62042DRCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5V Out/1.2A Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62042DRCRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5V Out/1.2A Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62043DGQ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 1.2A Hi-Ef Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62043DGQG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 1.2A Hi-Ef Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62043DGQR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 1.2A Hi-Ef Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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