參數資料
型號： L6716TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48
文件頁數： 30/57頁
文件大小： 829K
代理商： L6716TR
Soft-start
L6716
36/57
Doc ID 14521 Rev 3
17
Soft-start
L6716 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 and the output voltage increases accordingly with closed
loop regulation.
The device implements soft-start only when all the power supplies are above their own turn-
on thresholds and the OUTEN pin is set free.
At the end of the digital soft-start, SS_END signal is set free.
Protections are active during soft-start: under voltage is enabled when the reference voltage
reaches 0.6 V while overvoltage is always enabled.
Note:
If the PSI is already low during the start-up, the device implements the soft-start using the N
phases selected trough PWM4 pin. When the soft-start is finished the device turns OFF
some phases in according to the PSI strategy.
Figure 18.
Soft-start
Once L6716 receives all the correct supplies and enables, it initiates the Soft-Start phase
with a TD1=1.5 ms (typ) delay. After that, the reference ramps up to VBOOT = 1.081 V (1.100
V - 19 mV) in TD2 according to the SSOSC settings and waits for TD3 = 200 μsec (typ) during
which the device reads the VID lines. Output voltage will then ramps up to the programmed
value in TD4 with the same slope as before (see Figure 18).
SSOSC defines the frequency of an internal additional soft-start-oscillator used to step the
reference from zero up to the programmed value; this oscillator is independent from the
main oscillator whose frequency is programmed through the OSC pin.
The current flowing from SSOSC pin before the end of soft-start is used to program the
desiderated soft-start time (TSS).
After that the soft-start is finished the current flowing from SSOSC pin is used to program
the maximum LTB switching frequency (FLIMIT).
In the Figure 19 is shown the SSOSC connection in order to select both parameter (TSS and
FLIMIT) in independent way.
In particular, it allows to precisely programming the start-up time up to VBOOT (TD2) since it
is a fixed voltage independent by the programmed VID. Total soft-start time dependence on
the programmed VID results (see Figure 20).
OUTEN
SS_END
VOUT
t
T
D1
T
D2
T
D3TD4
TSS
OVP
T
D5
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相關代理商/技術參數
參數描述
L6717 制造商:STMicroelectronics 功能描述:High-Efficiency Hybrid AM2r2 Controller 48-Pin VFQFPN 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
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:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel
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