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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： | 7/33页 |
| 文件大小： | 1215K |
| 代理商： | L6728D |
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L6728D
Output voltage setting and protections
Doc ID 16498 Rev 1
15/33
9
Output voltage setting and protections
The L6728D is capable of precisely regulating an output voltage as low as 0.8 V. In fact, the
device is equipped with a fixed 0.8 V internal reference that guarantees the output regulated
voltage remains within a ±0.8% tolerance over line and temperature variations (excluding
output resistor divider tolerance, when present).
Output voltages higher than 0.8 V can be easily achieved by adding a resistor ROS between
the FB pin and ground. Referring to Figure 1, the steady-state DC output voltage is:
where VREF is 0.8 V.
The L6728D monitors the voltage at the VSEN pin and compares it to the internal reference
voltage in order to provide undervoltage and overvoltage protection as well as a PGOOD
signal. Depending on the level of VSEN, different actions are performed by the controller:
●
PGOOD: If the voltage monitored through VSEN goes outside the PGOOD window
limits, the device de-asserts the PGOOD signal while still continuing to switch and
regulate. PGOOD is asserted at the end of the soft-start phase.
●
Undervoltage protection: If the voltage at VSEN pin drops below the UV threshold,
the device turns off both the HS and LS MOSFETs, latching the condition. Cycle the
VCC to recover.
●
Overvoltage protection: If the voltage at VSEN pin rises over OV threshold (1 V typ),
overvoltage protection turns off the HS MOSFET and turns on the LS MOSFET. The LS
MOSFET is turned off as soon as VSEN goes below Vref/2 (0.4 V). The condition is
latched. Cycle the VCC to recover. Note that even if the device is latched, the device
still controls the LS MOSFET and can switch it on whenever VSEN rises above the OV
threshold.
●
Feedback disconnection protection: In order to provide load protection even if the
VSEN pin is not connected, a 100 nA bias current is always sourced from this pin. If
VSEN pin is not connected, this current permanently pulls it up, causing the device to
detect an OV. Thus, LS is latched on, preventing the output voltage from rising out of
control.
V
OUT
V
REF
1
R
FB
R
OS
-----------
+
=
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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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