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参数资料
| 型号： | L6711TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件页数： | 27/50页 |
| 文件大小： | 679K |
| 代理商： | L6711TR |
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L6711
Output voltage monitor and protections
33/50
14
Output voltage monitor and protections
The device monitors through pin VSEN the regulated voltage in order to manage the OVP /
UVP conditions.
14.1
UVP protection
If the output voltage monitored by VSEN drops below the 60% of the reference voltage for
more than one clock period, the device turns off all mosfets and the OSC/FAULT is driven
high (5V). The condition is latched; to recover it is required to cycle Vcc or the OUTEN pin.
14.2
Programmable OVP protection
Once VCC crosses the turn-ON threshold and the device is enabled (OUTEN = 1), the
device provides a programmable Over Voltage protection; when the voltage sensed
overcomes the programmed threshold, the controller permanently switches on all the low-
side mosfets and switches off all the high-side mosfets in order to protect the load. The
OSC/ FAULT pin is driven high (5V) and power supply or OUTEN pin cycling is required to
restart operations.
The OVP threshold is programmed through the OVP pin: leaving the pin floating, it is
internally pulled-up and the threshold is set at 115% (Typ.) of the programmed output
voltage. Connecting the OVP pin to SGND through a resistor ROVP, the OVP threshold
becomes a fixed voltage as follow:
OVPTH = 1.455 ROVP 12.5
14.3
Preliminary OVP protection (Pre-OVP)
While VCC pin is under the turn-ON threshold, a preliminary-OVP protection turns on the
low side mosfets as long as the FBR pin voltage is greater than 1.8V. This protection is
enabled when VCC stays within the device turn-on threshold and the PreOVP turn on
threshold and depends also on the OUTEN pin status as detailed in Figure 16 - left.
A simple way to provide protection to the output in all conditions when the device is OFF
(then avoiding the unprotected red region in Figure 16) consists in supplying the controller
Both Over Voltage and Under Voltage are active also during soft start (see the relevant
section).
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PDF描述 |
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| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
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相关代理商/技术参数 |
参数描述 |
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| L6712 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712AD | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6712ADTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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