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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： | 6/34页 |
| 文件大小： | 974K |
| 代理商： | L6727TR |
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Output voltage monitor and protections
L6727
14/34
Doc ID 12933 Rev 4
8
Output voltage monitor and protections
L6727 monitors the voltage at FB pin and compares it to internal reference voltage in order
to provide Under Voltage and Over Voltage protections.
8.1
Undervoltage protection
If the voltage at FB pin drops below UV threshold (0.6 V typ), the device turns off both HS
and LS MOSFETs, waits for 2048 clock cycles and then performs a new soft start. If under
voltage condition is not removed, the device enters a hiccup mode with a typical period of
13.6 ms.
UVP is active from the end of soft start.
8.2
Overvoltage protection
If the voltage at FB pin rises over OV threshold (1 V typ), over voltage protection turns off HS
MOSFET and turns on LS MOSFET overriding PWM logic as long as over voltage is
detected.
OVP is always active with top priority as soon as over current threshold setting phase has
been completed.
8.3
Feedback disconnection protection
In order to provide load protection even if FB pin is not connected, a 100 nA bias current is
always sourced from this pin. If FB pin is not connected, this current will permanently pull up
FB over OVP threshold: thus LS will be latched on preventing output voltage from rising out
of control.
8.4
Undervoltage lock out
In order to avoid anomalous behaviors of the device when the supply voltage is too low to
support its internal rails, UVLO is provided: the device will start up when VCC reaches
UVLO upper threshold and will shutdown when VCC drops below UVLO lower threshold.
The 4.1 V maximum UVLO upper threshold allows L6727 to be supplied from 5 V and 12 V
busses in or-ing diode configuration.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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