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| 型号： | L6728AHTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, VFDFPN-10 |
| 文件页数： | 4/33页 |
| 文件大小： | 1033K |
| 代理商： | L6728AHTR |
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Over-current protection
L6728AH
12/33
Doc ID 15726 Rev 1
7
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, L6728AH 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.
7.1
Over-current threshold setting
L6728AH allows to easily program a 1st level over-current threshold ranging from 50 mV to
550 mV, simply by adding a resistor (ROCSET) between LGATE and GND. 2
nd level threshold
will be automatically set accordingly.
During a short period of time (about 5 ms) following VCC rising over UVLO threshold, an
internal 10 A current (IOCSET) is sourced from LGATE pin, determining a voltage drop
across ROCSET. This voltage drop will be sampled and internally held by the device as 1
st
level over-current threshold. The OC setting procedure overall time length is about 5 ms.
Connecting a ROCSET resistor between LGATE and GND, the programmed 1
st level
threshold will be:
the programmed 2nd level threshold will be:
In case ROCSET is not connected, the device sets the OCP thresholds to the maximum
values: an internal safety clamp on LGATE is triggered as soon as LGATE voltage reaches
600 mV, setting the maximum threshold and suddenly ending OC setting phase.
I
OCth1
I
OCSET
R
OCSET
R
dsON
--------------------------------------------
=
I
OCth2
1.5
I
OCSET
R
OCSET
R
dsON
--------------------------------------------
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6728ATR | 功能描述:电压模式 PWM 控制器 HIGH FREQ SINGLE PHASE PWM CNTRL 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 |
| L6728D | 功能描述:电流型 PWM 控制器 SNGL PHASE PWM 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 |
| 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 |
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