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參數(shù)資料
| 型號： | L6701TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | LEAD FREE, SSO-36 |
| 文件頁數(shù)： | 21/44頁 |
| 文件大小： | 627K |
| 代理商： | L6701TR |
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12 Soft Start
L6701
28/44
12
Soft Start
L6701 implements a soft-start to smoothly charge the output filter avoiding high in-rush currents
to be required to the input power supply. The device increases the reference from zero up to
the programmed value in 2048 clock periods and the output voltage increases accordingly with
closed loop regulation. At the end of the digital Soft-Start, SSEND/PGOOD signal is set free.
Protections are active during this phase; Under Voltage is enabled when the reference voltage
reaches 0.6V while Over Voltage is always enabled with a threshold dependent on the selected
Operative Mode. DAC table information is frozen just before initializing the Soft-Start.
The device implements Soft-Start only when all the power supplies are above their own turn-on
thresholds and the EN pin is set free.
12.1
Low-Side-Less Startup (LSLess)
In order to avoid any kind of negative undershoot and dangerous return from the load during
start-up, L6701 performs a special sequence in enabling LS driver to switch: during the soft-
start phase, the LS driver results disabled (LS = OFF) until the HS starts to switch. This avoid
the dangerous negative spike on the output voltage that can happen if starting over a pre-
biased output (See Figure 12).
This particular feature of the device masks the LS turn-on only from the control loop point of
view: protections by-pass this turning ON the LS MOSFET in case of need.
Figure 12. LSLess Startup (left) vs. Non-LSLess Startup (right)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6712DTR | 2 A SWITCHING CONTROLLER, PDSO28 |
| L6712Q | 2 A SWITCHING CONTROLLER, QCC36 |
| L6712ADTR | 2 A SWITCHING CONTROLLER, PDSO28 |
| L6712D | 2 A SWITCHING CONTROLLER, PDSO28 |
| L6712QTR | 2 A SWITCHING CONTROLLER, QCC36 |
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| L6709TR | 功能描述:功率驅(qū)動器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L6710 | 功能描述:功率驅(qū)動器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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