參數(shù)資料
型號(hào)： TPS40180RGER
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 29/52頁(yè)
文件大?。?/td> 1291K
代理商： TPS40180RGER
www.ti.com
DESIGN EXAMPLE
Single Output Configuration from 12-V to 1.5-V DC-to-DC Converter Using a TPS40180
Inductor Selection
IN(max)
OUT
RIPPLE
IN(max)
SW
V
1
L
I
V
f
-
=
(19)
Step 2: Output Capacitor Selection
(
)
2
TRAN(max)
OUT(min)
IN(min)
OUT
UNDER
I
L
C
V
=
-
(20)
2
TRAN(max)
OUT(min)
OUT
OVER
I
L
C
V
=
(21)
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
The following example illustrates the design process and component selection for a single output synchronous
buck converter using TPS40180. The design goal parameters are given in the table below. A list of symbol
definitions is found at the end of this section.
Design Goal Parameters
SYMBOL
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
VIN
Input voltage
10.8
12
13.2
V
VOUT
Output voltage
1.5
V
VRIPPLE
Output ripple
IOUT=20A
30
mV
IOUT
Output current
20
A
fSW
Switching frequency
280
kHz
The inductor is determined by the desired ripple current. The required inductor is calculated by:
Typically the peak to peak inductor current IRIPPLE is selected to be around 25% of the rated output current. In
this design, IRIPPLE is targeted at 25% of IOUT. The calculated inductor is 0.95 H and in practical a 1uH inductor
with 1.7 m
DCR from Vishay is selected. The real inductor ripple current is 4.7 A.
The output capacitor is typically selected by the output load transient response requirement. Equation 20
estimates the minimum capacitor to reach the under voltage requirement with load step up. Equation 21
estimates the minimum capacitor for over voltage requirement with load step down. When VIN(min)< 2×VOUT, the
minimum output capacitance can be calculated using Equation 20. Otherwise, Equation 21 is used.
when VIN(min)<2×VOUT
when VIN(min)>2×VOUT
In this design, VIN(min) is much larger than 2×VOUT, so Equation 21 is used to determine the minimum
capacitance. Based on a 8-A load transient with a maximum of 60 mV deviation, a minimum 711-
F output
capacitor is required. In the design, four 220-
F, 4-V, SP capacitor are selected to meet this requirement. Each
capacitor has an ESR of 5 m
.
Another criterion for capacitor selection is the output ripple voltage. The output ripple is determined mainly by the
capacitance and the ESR.
Copyright 2007, Texas Instruments Incorporated
35
Product Folder Link(s): TPS40180
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40180RGERG4 功能描述:DC/DC 開(kāi)關(guān)控制器 Single Ph Stackable Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40180RGET 功能描述:DC/DC 開(kāi)關(guān)控制器 Single Ph Stackable Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40180RGETG4 功能描述:DC/DC 開(kāi)關(guān)控制器 Sgl Phase Stackable Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40190 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LOW PIN COUNT SYNCHRONOUS BUCK CONTROLLER
TPS40190DRC 制造商:Texas Instruments 功能描述:DC/DC CONTROLLER
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