參數(shù)資料
型號(hào)： L6728D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, ROHS COMPLIANT, DFN-10
文件頁(yè)數(shù)： 4/33頁(yè)
文件大?。?/td> 1215K
代理商： L6728D
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6728DTR 功能描述:電流型 PWM 控制器 Single-Phase PWM 5V to 12V Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6728H 功能描述:電壓模式 PWM 控制器 Sgl Output 300 KHz DFN-10 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
L6728HTR 功能描述:電流型 PWM 控制器 SINGLE PHASE PWM CNTRL PWR GOOD RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6728TR 功能描述:DC/DC 開(kāi)關(guān)控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
L6730 功能描述:DC/DC 開(kāi)關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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