參數(shù)資料
型號(hào)： TPS61120
廠(chǎng)商： Texas Instruments, Inc.
英文描述： SYNCHRONOUS BOOST CONVERTER WITH 1.1A SWITCH AND INTEGRATED LDO
中文描述： 同步升壓轉(zhuǎn)換器與1.1A的開(kāi)關(guān)和集成穩(wěn)壓器
文件頁(yè)數(shù)： 16/25頁(yè)
文件大?。?/td> 462K
代理商： TPS61120
www.ti.com
Capacitor Selection
Cmin
IOUT
VOUT
V
VBAT
VOUT
(7)
VESR
IOUT
RESR
(8)
AREG
d
VFB
10
(1
(R3
i
R6)
R6
1.6 s)
(9)
TPS61120
TPS61122, TPS61121
SLVS427C–JUNE 2002–REVISED APRIL 2004
List of Inductors
VENDOR
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CDRH5D18
CDRH6D28
7447789___
7447779___
DR73
DR74
SLF 7032
B82462G
Sumida
Wurth Electronik
Coiltronics
TDK
EPCOS
Input Capacitor
At least a 10-μF 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.
Output Capacitor DC/DC Converter
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 7:
Parameter
f
is the switching frequency and
V is the maximum allowed ripple.
With a chosen ripple voltage of 10 mV, a minimum capacitance of 22 μF 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 8:
An additional ripple of 20 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 30 mV. Additional ripple is caused by load transients. This means that the output
capacitance needs to be larger than calculated above to meet the total ripple requirements. The output capacitor
has to completely supply the load during the charging phase of the inductor. A reasonable value of the output
capacitance depends on the speed of the load transients and the load current during the load change. In typical
applications a 100 μF capacitance is recommended. For economical reasons this usually is a tantalum capacitor.
Because of this the control loop has been optimized for using output capacitors with an ESR of above 30 m
.
The minimum value for the output capacitor is 22 μF.
Small Signal Stability
When using output capacitors with lower ESR, like ceramics, it is recommended to use the adjustable voltage
version. The missing ESR can be easily compensated there in the feedback divider. Typically a capacitor in the
range of 10 pF in parallel with R3 helps to obtain small signal stability, with the lowest ESR output capacitors.
For more detailed analysis the small signal transfer function of the error amplifier and regulator, which is given in
Equation 9, can be used.
16
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參數(shù)描述
TPS61120EVM-205 功能描述:電源管理IC開(kāi)發(fā)工具 TPS61120-205 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS61120PW 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 Adj Hi-Eff Boost Cnvrtr w/200mA LDO RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
TPS61120PWG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 Adj Hi-Eff Boost Cnvrtr w/200mA LDO RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
TPS61120PWR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 Adj Hi-Eff Boost Cnvrtr w/200mA LDO RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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
TPS61120PWRG4 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 Adj Hi-Eff Boost Cnvrtr w/200mA LDO RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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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