參數(shù)資料
型號(hào)： L6730B
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封裝： HTSSOP-20
文件頁(yè)數(shù)： 27/52頁(yè)
文件大?。?/td> 1569K
代理商： L6730B
L6730 - L6730B
Application details
Doc ID 11938 Rev 3
33/52
6
Application details
6.1
Inductor design
The inductance value is defined by a compromise between the transient 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. The inductance value
can be calculated with the following relationship
:
Where FSW is the switching frequency, VIN is the input voltage and VOUT is the output
voltage. Figure 28 shows the ripple current vs. the output voltage for different values of the
inductor, with VIN = 5 V and VIN = 12 V at a switching frequency of 400 kHz.
Increasing the value of the inductance reduces the current ripple but, at the same time,
increases the converter response time to a load transient. If the compensation network is
well designed, during a load transient the device is able to set the duty cycle to 100% or to
0%. When one of these conditions is reached, the response time is limited by the time
required to change the inductor current. During this time the output current is supplied by
the output capacitors. Minimizing the response time can minimize the output capacitor size.
Figure 28.
Inductor current ripple
Vin
Vout
I
Fsw
Vout
Vin
L
Δ
(6)
0
1
2
3
4
5
6
7
8
01
2
3
4
OUT P UT V O LT AG E (V )
IN
D
UCT
O
R
CURRE
N
T
RI
P
L
Vin=5V, L=500nH
Vin=5V, L=1.5uH
Vin=12V, L=2uH
Vin=12V, L=1uH
相關(guān)PDF資料
PDF描述
L6730TR 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6732CTR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6732 SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6732TR SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6788ATR 3-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6730BTR 功能描述:DC/DC 開關(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
L6730C 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF)
L6730CQ 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
L6730CQTR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
L6730CTR 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF)
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