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參數(shù)資料
| 型號： | TPS61131PWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.6 A BATTERY CHARGE CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 10/29頁 |
| 文件大?。?/td> | 861K |
| 代理商： | TPS61131PWG4 |
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Capacitor Selection
Input Capacitor
Flying Capacitor DC/DC Converter
C
min +
100
4p2
2L
(7)
Output Capacitor DC/DC Converter
C
min +
I
OUT
V
OUT
DV
V
OUT )
V
BAT
(8)
DVESR + IOUT
R
ESR
(9)
SLVS431B – JUNE 2002 – REVISED JANUARY 2008
has been optimized to operate with inductance values between 10
H and 47 H. Nevertheless operation with
higher inductance values may be possible in some applications. Detailed stability analysis is recommended. Care
has to be taken that load transients and losses in the circuit can lead to higher currents as estimated in
Equation 6. Also, the losses in the inductor caused by magnetic hysteresis losses and copper losses are a major
parameter for total circuit efficiency.
The following inductor series from different suppliers have been used with the TPS6113X converters:
List of Inductors
VENDOR
RECOMMENDED INDUCTOR SERIES
COUPLED INDUCTOR SERIES
LPS4012
LPD4012
Coilcraft
LPS3015
Cooper Electronics Technologies
DR73
DRQ73
DR74
DRQ74
EPCOS
B82462G
Sumida
CDRH5D18
7447789___
744878220
Wurth Electronik
7447779___
744877220
At least a 10-
F input capacitor is recommended to improve transient behavior of the regulator and EMI behavior
of the total power supply circuit. A ceramic capacitor or a tantalum capacitor with a 100-nF ceramic capacitor in
parallel, placed close to the IC, is recommended.
In the normal operating mode, the flying capacitor (C7) must be large enough so that the voltage across the
capacitor is small. This means the resonance frequency formed by the flying capacitor and the inductors must be
at least ten times lower than the switching frequency (see Equation 7).
Where L is the inductance of L1-A or L1-B.
To optimize efficiency, capacitors with very low ESR such as ceramic capacitors are recommended. The voltage
rating of the flying capacitor must be higher than the input voltage VBAT.
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by
using Equation 8:
Parameter f is the switching frequency and
ΔV is the maximum allowed ripple.
With a chosen ripple voltage of 15 mV, a minimum capacitance of 26
F is needed. The total ripple is larger due
to the ESR of the output capacitor. This additional component of the ripple can be calculated using Equation 9:
An additional ripple of 24 mV is the result of using a tantalum capacitor with a low ESR of 80 m
. The total ripple
is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor. In this
example, the total ripple is 39 mV. Additional ripple is caused by load transients. This means that the output
18
Copyright 2002–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS61130 TPS61131 TPS61132
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61131PWR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3V 90% Eff SEPIC 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 |
| TPS61131PWRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3V 90% Eff SEPIC 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 |
| TPS61132 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS SEPIC / FLYBACK CONVERTER WITH 1.1A SWITCH AND INTEGRATED LDO |
| TPS61132PW | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3V 90% Eff SEPIC 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 |
| TPS61132PWG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3V 90% Eff SEPIC 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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