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| 型号： | L6728H |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, DFN-10 |
| 文件页数： | 4/32页 |
| 文件大小： | 1213K |
| 代理商： | L6728H |
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Over current protection
L6728H
12/32
Doc ID 15725 Rev 1
8
Over current protection
The over current function protects the converter from a shorted output or overload, by
sensing the output current information across the low side MOSFET drain-source on-
resistance, RDS(on). This method reduces cost and enhances converter efficiency by
avoiding the use of expensive and space-consuming sense resistors.
The low side RDS(on) current sense is implemented by comparing the voltage at the PHASE
node when LS MOSFET is turned on with the programmed OCP thresholds voltages,
internally held. If the monitored voltage is bigger than these thresholds, an over current
event is detected.
For maximum safety and load protection, L6728H implements a dual level over current
protection system:
●
1st level threshold: it is the user externally set threshold. If the monitored voltage on
PHASE exceeds this threshold, a 1st level over current is detected. If four 1st level OC
events are detected in four consecutive switching cycles, over current protection will be
triggered.
●
2nd level threshold: it is an internal threshold whose value is equal to 1st level
threshold multiplied by a factor 1.5. If the monitored voltage on PHASE exceeds this
threshold, over current protection will be triggered immediately.
When over current protection is triggered, the device turns off both LS and HS MOSFETs in
a latched condition.
To recover from over current protection triggered condition, VCC power supply must be
cycled.
相关PDF资料 |
PDF描述 |
|---|---|
| L6728 | 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10 |
| L6728TR | 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10 |
| L6731BTR | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6731B | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6731D | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6728HTR | 功能描述:电流型 PWM 控制器 SINGLE PHASE PWM CNTRL PWR GOOD 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 |
| L6728TR | 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 |
| L6730 | 功能描述:DC/DC 开关控制器 Adjustable Step Down 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 |
| L6730_09 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6730B | 功能描述:DC/DC 开关控制器 Adjustable Step Down 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 |
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