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| 型号： | L6728D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, DFN-10 |
| 文件页数： | 5/33页 |
| 文件大小： | 1215K |
| 代理商： | L6728D |
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L6728D
Overcurrent protection
Doc ID 16498 Rev 1
13/33
8
Overcurrent protection
The overcurrent 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 the LS MOSFET is turned on with the programmed OCP threshold voltages,
internally held. If the monitored voltage is higher than these thresholds, an overcurrent event
is detected.
For maximum safety and load protection, the L6728D implements a dual-level overcurrent
protection system:
●
1st level threshold: This is the user externally-set threshold. If the monitored voltage
on PHASE exceeds this threshold, a 1st level overcurrent is detected. If four 1st level
OC events are detected in four consecutive switching cycles, overcurrent protection is
triggered.
●
2nd level threshold: This is an internal threshold whose value is equal to the 1st level
threshold multiplied by a factor 1.5. If the monitored voltage on PHASE exceeds this
threshold, overcurrent protection is triggered immediately.
When overcurrent protection is triggered, the device turns off both the LS and HS MOSFETs
in a latched condition.
To recover from an overcurrent protection-triggered condition, the VCC power supply must
be cycled.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6728DTR | 功能描述:电流型 PWM 控制器 Single-Phase PWM 5V to 12V Controller 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 |
| L6728H | 功能描述:电压模式 PWM 控制器 Sgl Output 300 KHz DFN-10 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 |
| 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 |
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