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| 型号： | L6727TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, SOP-8 |
| 文件页数： | 3/34页 |
| 文件大小： | 974K |
| 代理商： | L6727TR |
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L6727
Soft-start and disable
Doc ID 12933 Rev 4
11/34
6
Soft-start and disable
L6727 implements a soft-start to smoothly charge the output filter avoiding high in-rush
currents to be required from the input power supply. The device progressively increases the
internal reference from 0 V to 0.8 V in about 5.1 ms, in closed loop regulation, gradually
charging the output capacitors to the final regulation voltage.
In the event of an overcurrent triggering during soft start, the over current logic will override
the soft start sequence and will shut down both the high side and low side gates for the
internal soft start residual time (up to 2048 clock cycles) plus 2048 clock cycles, then it will
begin a new soft start.
The device begins soft start phase only when VCC power supply is above UVLO threshold
and overcurrent threshold setting phase has been completed.
6.1
Low-side-less start up (LSLess)
In order to manage start up over pre-biased output, L6727 performs a special sequence in
enabling LS driver to switch: during the soft-start phase, LS driver results disabled
(LS = OFF) until HS starts to switch. This avoids the dangerous negative spike on the output
voltage that can happen if starting over a pre-biased output.
If the output voltage is pre-biased to a voltage lower than the programmed one, neither HS
nor LS will turn on until the soft start ramp exceeds the output pre-bias voltage; then VOUT
will ramp up from there, without any drop or current return.
If the output voltage is pre-biased to a voltage higher than the programmed one, 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: protections by-pass LSLESS, turning ON the LS MOSFET in case of need.
Figure 4.
LSless startup (left) vs non-lsless startup (right)
相关PDF资料 |
PDF描述 |
|---|---|
| L6727 | 1.5 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| L6728AHTR | SWITCHING CONTROLLER, PDSO10 |
| L6730DTR | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6730D | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6730CQTR | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, QCC24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6728 | 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 |
| L6728_0706 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Single phase PWM controller with Power Good |
| L6728A | 功能描述:电压模式 PWM 控制器 Hi-Freq. singl-phase PWM controller w/Po 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 |
| L6728AH | 功能描述:软开关 PWM 控制器 Sgl Output 600 KHz DFPN-10 RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6728AHTR | 功能描述:电流型 PWM 控制器 HIGH FREQ PWM CNTRL W/PO 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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