參數(shù)資料
型號(hào)： L6717
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48
文件頁(yè)數(shù)： 35/56頁(yè)
文件大小： 1081K
代理商： L6717
Output voltage positioning
L6717
40/56
Doc ID 17326 Rev 1
7.8
Soft-start
L6717 implements a soft-start to smoothly charge the output filter avoiding high in-rush cur-
rents to be required to the input power supply. In SVI mode, soft-start time is intended as the
time required by the device to set the output voltages to the Pre-PWROK Metal VID. During
this phase, the device increases the reference of the enabled section(s) from zero up to the
programmed reference in closed loop regulation. Soft-start is implemented only when VCC
is above UVLO threshold and the EN pin is set free. See Section 5 for details about the SVI
interface and how SVC/SVD are interpreted in this phase.
At the end of the digital soft-start, PWRGOOD signal is set free.
Protections are active during this phase as follow:
–
Undervoltage is enabled when the reference voltage reaches 0.5 V.
–
Overvoltage is always enabled according to the programmed threshold (by ROVP).
–
FB disconnection is enabled.
Reference is increased with fixed dV/dt; Soft-start time depends on the programmed voltage
as follow:
Figure 12.
System start-up: SVI (left) and PVI (right)
7.8.1
LS-Less Start-up
In order to avoid any kind of negative undershoot on the load side during start-up, L6717
performs a special sequence in enabling the drivers for both sections: during the soft-start
phase, the LS MOSFET is kept OFF (PWMx set to HiZ and ENDRV = 0) until the first PWM
pulse. After the first PWM pulse, the PWMx outputs switches between logic “0” and logic “1”
and ENDRV are set to logic “1”.
This particular sequence avoids the dangerous negative spike on the output voltage that
can happen if starting over a pre-biased output especially when exiting from a CORE-OFF
state.
Low-side MOSFET turn-on is masked only from the control loop point of view: protections
are still allowed to turn-ON the low-side MOSFET in case of over voltage if needed.
T
SS ms
[]
Target_VID 2.56
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6717A 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717ATR 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller T/R 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Tape and Reel 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 High-Efficienc AM2r2 Hybrid Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6718TR 功能描述:其他電源管理 Multiphase Dual PWM VR12 25MHz LTB RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel
L6720 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:
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