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參數(shù)資料
| 型號： | TPS62020DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER |
| 中文描述： | 600 mA/1.25兆赫高效降壓型轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 425K |
| 代理商： | TPS62020DRC |
www.ti.com
Inductor Selection
The TPS62020 uses typically a 10-μH output inductor. Larger or smaller inductor values can be used to optimize
the performance of the device for specific operation conditions. When changing inductor values, the product of
the inductor value times output-capacitor value (L
×
C) should stay constant. For example, when reducing the
inductor value, increase the output capacitor accordingly. See the application circuits in Figure 17, Figure 18, and
Figure 19. 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 Equation 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 Equation 7. This is needed because during heavy load transient the
inductor current rises above the value calculated under Equation 7.
IL
VO
1–
VO
VI
L
(6)
ILmax
IOmax
IL
2
(7)
Output Capacitor Selection
The advanced fast response voltage mode control scheme of the TPS62020 allows the use of small ceramic
capacitors with a typical value of 10 μF and 22 μF without having large output voltage under and overshoots
during heavy load transients. Ceramic capacitors having low ESR values have the lowest output voltage ripple
and are recommended. If required, tantalum capacitors may be used as well. Refer to Table 2 for component
selection. If ceramic output capacitors are used, the capacitor RMS ripple current rating always meets the
application requirements. Just for completeness the RMS ripple current is calculated as:
IRMSCout
VO
1–
VO
VI
L
1
2
3
(8)
TPS62020, TPS62021
SLVS076B–JUNE 2003–REVISED APRIL 2004
APPLICATION INFORMATION (continued)
with:
7 = 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 1.3 A for the TPS62020. 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
10 μH
10 μH
3.3 μH
6.8 μH
DIMENSIONS
COMPONENT SUPPLIER
Coilcraft DO1608C-103
Sumida CDRH4D28-100
Sumida CDRH4D22 3R3
Sumida CMD5D13 6R8
6,6 mm
×
4,75 mm
×
2,92 mm
5,0 mm
×
5,0 mm
×
3,0 mm
5,0 mm
×
5,0 mm
×
2,4 mm
5,8 mm
×
7,4 mm
×
1,5 mm
At nominal load current the device operates in PWM mode and the overall output voltage ripple is the sum of the
voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and discharging the
output capacitor:
13
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| TPS62020DRCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA Hi-Eff Step-Down 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62020DRCRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA Hi-Eff Step-Down 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62020EVM-019 | 功能描述:電源管理IC開發(fā)工具 TPS62020-019 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)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 |
| TPS62021DGQR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62021DGQRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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