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参数资料
| 型号： | L6727TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, SOP-8 |
| 文件页数： | 13/34页 |
| 文件大小： | 974K |
| 代理商： | L6727TR |
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Application information
L6727
20/34
Doc ID 12933 Rev 4
10
Application information
10.1
Output inductor
Inductor value is defined by a compromise between dynamic response, ripple, efficiency,
cost and size. Usually, inductance is calculated to maintain inductor ripple current (
ΔI
L)
between 20 % and 30 % of maximum output current. Given the switching frequency (FSW),
the input voltage (VIN), the output voltage (VOUT) and the desired ripple current (ΔIL),
inductance can be calculated as follows:
Figure 1 shows the ripple current vs. the output voltage for different inductance, with
VIN = 5 V and VIN = 12 V.
Increasing inductance reduces inductor ripple current (and output voltage ripple
accordingly) but, at the same time, increases the converter response time to load transients.
Higher inductance means that the inductor needs more time to change its current from initial
to final value. Until the inductor has not finished its charging, the additional output current is
supplied by output capacitors. Minimizing the response time lead to minimize the output
capacitance required. If the compensation network is designed with high bandwidth, during
an heavy load transient the device is able to saturate duty cycle (0 % or 80 %). When this
condition is reached, the response time is limited only by the time required to charge the
inductor.
Figure 10.
Inductor current ripple vs output voltage
L
V
IN
V
OUT
–
F
SW
ΔI
L
------------------------------
V
OUT
V
IN
--------------
=
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| L6727 | 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
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| L6728 | 功能描述:DC/DC 开关控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6728_0706 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller with Power Good |
| L6728A | 功能描述:电压模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6728AH | 功能描述:软开关 PWM 控制器 Sgl Output 600 KHz DFPN-10 RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6728AHTR | 功能描述:电流型 PWM 控制器 HIGH FREQ PWM CNTRL W/PO RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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