參數(shù)資料
型號： TPS40074RHLRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： GREEN, PLASTIC, QFN-20
文件頁數(shù)： 16/41頁
文件大小： 765K
代理商： TPS40074RHLRG4
www.ti.com
I
CAP(RMS) +
I
LOAD(max) * IIN(avg)
2
) D
I2
12
D ) IIN(avg)
2
(1 * D)
(25)
I
D +
V
O
V
IN(min)
I
LOAD(max)
2
) D
I2
12
(26)
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
3.1.3. Input Capacitor, CIN, ELCO and MLCC
The input capacitor is selected to handle the ripple current of the buck stage. Also a relative large capacitance is
used to keep the ripple voltage on the supply line low. This is especially important where the supply line is high
impedance. It is recommended that the supply line be kept low impedance. The input capacitor ripple current
can be calculated using Equation 25.
where
I
IN(avg) is the average input current
This is calculated simply by multiplying the output DC current by the duty cycle. The ripple current in the input
capacitor is 5.05 A. A 1206 MLCC using X7R material has a typical dissipation factor of 5%. For a 2.2 F
capacitor at 400 kHz the ESR is approximately 7.2 m
. If two capacitors are used in parallel the power
dissipation in each capacitor is less than 46 mW.
A 470 F/16 V electrolytic capacitor is added to maintain the voltage on the input rail.
3.1.4 Switching MOSFET, QSW
The following key parameters must be met by the selected MOSFET.
Drain source voltage, VDS, must be able to withstand the input voltage plus spikes that may be on the
switching node. For this design a VDS rating of 25 V to 30 V is recommended.
Drain current, ID, at 25°C, must be greater than that calculated using Equation 26. For this design, ID should
be greater than 5 A.
Gate source voltage, V
GS must be able to withstand the gate voltage from the control device . For the
TPS40074 this is 9 V.
Once the above boundary parameters are defined the next step in selecting the switching MOSFET is to select
the key performance parameters. Efficiency is the performance characteristic which drives the other selection
criteria. Target efficiency for this design is 90%. Based on 1.5-V output and 15 A this equates to a power loss in
the converter of 2.5 W. Using this figure a target of 0.5 W dissipated in the switching MOSFET was chosen.
23
相關(guān)PDF資料
PDF描述
TPS40074RHL 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20
TPS40075RHLR 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
TPS40075RHLTG4 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
TPS40077PWPR 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
TPS40077PWPRG4 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40074RHLT 功能描述:DC/DC 開關(guān)控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
TPS40074RHLTG4 功能描述:DC/DC 開關(guān)控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
TPS40075 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD
TPS40075EVM-001 功能描述:電源管理IC開發(fā)工具 15A 12V In 1.5V Out 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
TPS40075RHLR 功能描述:DC/DC 開關(guān)控制器 Wide Input Synch Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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
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