參數(shù)資料
型號(hào)： L6728D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, ROHS COMPLIANT, DFN-10
文件頁(yè)數(shù)： 13/33頁(yè)
文件大小： 1215K
代理商： L6728D
Application information
L6728D
20/33
Doc ID 16498 Rev 1
11
Application information
11.1
Inductor design
The inductance value is defined by a compromise between the dynamic response time, the
efficiency, the cost and the size. The inductor has to be calculated to maintain the ripple
current (
ΔI
L) between 20% and 30% of the maximum output current (typ). The inductance
value can be calculated with the following equation:
Where FSW is the switching frequency, VIN is the input voltage and VOUT is the output
voltage. Figure 9 shows the ripple current vs. the output voltage for different values of the
inductor, with VIN = 5 V and VIN = 12 V.
Increasing the value of the inductance reduces the current ripple but, at the same time,
increases the converter response time to a dynamic load change. The response time is the
time required by the inductor to change its current from initial to final value. Until the inductor
has finished its charging time, the output current is supplied by the output capacitors.
Minimizing the response time can minimize the output capacitance required. If the
compensation network is well-designed, during a load variation the device is able to set a
duty cycle value very different (0% or 80%) from a steady-state one. When this condition is
reached, the response time is limited by the time required to change the inductor current.
Figure 9.
Inductor current ripple vs output voltage
L
V
IN
V
OUT
–
F
SW
ΔI
L
------------------------------
V
OUT
V
IN
--------------
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6728DTR 功能描述:電流型 PWM 控制器 Single-Phase PWM 5V to 12V Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6728H 功能描述:電壓模式 PWM 控制器 Sgl Output 300 KHz DFN-10 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
L6728HTR 功能描述:電流型 PWM 控制器 SINGLE PHASE PWM CNTRL PWR GOOD RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6728TR 功能描述:DC/DC 開(kāi)關(guān)控制器 Sngl phase PWM 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
L6730 功能描述:DC/DC 開(kāi)關(guān)控制器 Adjustable Step Down 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
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