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| 型號： | TPS62420DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 19/37頁 |
| 文件大小： | 1020K |
| 代理商： | TPS62420DRCT |
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VIN 2.5 V – 6 V
TPS62421
10 F
m
VIN
EN_1
EN_2
MODE/
DATA
GND
DEF_1
SW2
SW1
ADJ2
FB 1
2.2 H
m
2.2 H
m
22 F
m
22 F
m
V
= 1.2V / 1.8V
600 mA
OUT1
V
= 1.8 V
1000 mA
OUT2
1.2V
1.8V
DIL + Vout
1 *
Vout
Vin
L
I
Lmax + Ioutmax )
DIL
2
SLVS676C – JUNE 2006 – REVISED JUNE 2010
www.ti.com
Figure 35. Typical Application Circuit TPS62421
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The device is optimized to operate with inductors of 2.2mH to 4.7mH and output capacitors of 10mF to 22mF.
For operation with a 2.2mH inductor, a 22mF capacitor is suggested.
Inductor Selection
The selected inductor has to be rated for its DC resistance and saturation current. The DC resistance of the
inductance will influence directly the efficiency of the converter. Therefore an inductor with lowest DC resistance
should be selected for highest efficiency.
Equation 6 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 7. This is
recommended because during heavy load transient the inductor current will rise above the calculated value.
(6)
(7)
With:
f = Switching Frequency (2.25MHz typical)
L = Inductor Value
ΔIL= Peak to Peak inductor ripple current
ILmax = Maximum Inductor current
The highest inductor current will occur at maximum Vin.
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 the
corresponding converter. It must be considered, that the core material from inductor to inductor differs and will
have an impact on the efficiency especially at high switching frequencies.
Refer to Table 7 and the typical applications for possible inductors.
26
Copyright 2006–2010, Texas Instruments Incorporated
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| TPS62420DRC | 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS62421DRCR | 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS62510DRCRG4 | 1.5 A SWITCHING REGULATOR, 1700 kHz SWITCHING FREQ-MAX, PDSO10 |
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| TPS62510DRC | 1.5 A SWITCHING REGULATOR, 1700 kHz SWITCHING FREQ-MAX, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62420DRCT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC 制造商:Texas Instruments 功能描述:IC, DUAL STEP-DOWN CONVERTER, SON-10 |
| TPS62420DRCTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Dual Adj 600mA & 1000mA 2.25MHz 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 |
| TPS62420EVM-167 | 功能描述:電源管理IC開發(fā)工具 STEP DOWN CONVERTER 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 |
| TPS62420QDRCRQ1 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Dual,Adj,600mA&1000 mA,2.25MHz 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62421DRCR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2.25MHz 600mA/1000 mA Dual Step Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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