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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： | 4/33页 |
| 文件大小： | 1215K |
| 代理商： | L6728D |
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Soft-start
L6728D
12/33
Doc ID 16498 Rev 1
7
Soft-start
The L6728D implements a soft-start to smoothly charge the output filter, avoiding the high
in-rush currents to be required from the input power supply. The device gradually increases
the internal reference from 0 V to 0.8 V in 4.5 ms (typ.), in closed-loop regulation, linearly
charging the output capacitors to the final regulation voltage.
In the event of overcurrent triggering during soft-start, the overcurrent logic overrides the
soft-start sequence and shuts down the PWM logic and both the high side and low side
gates. This condition is latched. Cycle the VCC to recover.
The device begins the soft-start phase only when the VCC power supply is above the UVLO
threshold and the overcurrent threshold setting phase has been completed.
7.1
Low-side-less startup (LSLess)
In order to avoid any kind of negative undershoot and dangerous return from the load during
startup, the L6728D performs a special sequence in enabling the LS driver to switch: during
the soft-start phase, the LS driver is disabled (LS = OFF) until the HS starts to switch. This
prevents the dangerous negative spike on the output voltage which can happen if starting
over a pre-biased output.
If the output voltage is pre-biased to a voltage higher than the final one, the HS would never
start to switch. In this case, at the end of soft-start time, LS is enabled and discharges the
output to the final regulation value.
This particular feature of the device masks the LS turn-on only from the control loop point of
view: protection features bypass this turning on of the LS MOSFET if needed.
Figure 4.
LSLess startup (left) vs. non-LSLess startup (right)
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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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