參數(shù)資料
型號： LTC6992HDCB6-4#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO6
封裝： 2 X 3 MM, LEAD FREE, PLASTIC, MO-229TBD, DFN-6
文件頁數(shù)： 10/32頁
文件大?。?/td> 322K
代理商： LTC6992HDCB6-4#TRPBF
LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
18
69921234p
Changing DIVCODE After Start-Up
Following start-up, the A/D converter will continue
monitoring VDIV for changes. Changes to DIVCODE will
be recognized slowly, as the LTC6992 places a priority on
eliminating any “wandering” in the DIVCODE. The typical
delay depends on the difference between the old and
new DIVCODE settings and is proportional to the master
oscillator period.
tDIVCODE = 16 (ΔDIVCODE + 6) tMASTER
A change in DIVCODE will not be recognized until it is
stable, and will not pass through intermediate codes.
A digital filter is used to guarantee the DIVCODE has settled
to a new value before making changes to the output. Then
the output will make a clean (glitchless) transition to the
new divider setting.
OPERATION
Start-Up Time
When power is first applied to the LTC6992 the power-on
reset (POR) circuit will initiate the start-up time, tSTART.
The OUT pin is held low during this time. The typical value
for tSTART ranges from 0.5ms to 8ms depending on the
master oscillator frequency (independent of NDIV):
tSTART(TYP) = 500 tMASTER
The output will begin oscillating after tSTART. If POL = 0
the first pulse has the correct width. If POL = 1 (DIVCODE
≥ 8), the first pulse width can be shorter or longer than
expected, depending on the duty cycle setting, and will
never be less than 25% of tOUT.
During start-up, the DIV pin A/D converter must determine
the correct DIVCODE before the output is enabled. The
start-up time may increase if the supply or DIV pin volt-
ages are not stable. For this reason, it is recommended to
minimize the capacitance on the DIV pin so it will properly
track V+. Less than 100pF will not affect performance.
6992 F06
OUT
DIV
STABLE VDIV
V+
tDIVCODE
tSTART
1ST PULSE WIDTH MAY BE INACCURATE
Figure 5. DIVCODE Change from 5 to 2
Figure 6. Start-Up Timing Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC6992HS6-1#PBF 制造商:Linear Technology 功能描述:TIMER 1MHZ 5.5V TSOT-23-6 制造商:Linear Technology 功能描述:TIMER, 1MHZ, 5.5V, TSOT-23-6, Operating Mode:-, No. of Timers:1, Frequency:1MHz, 制造商:Linear Technology 功能描述:TIMER, 1MHZ, 5.5V, TSOT-23-6, Operating Mode:(Not Available), No. of Timers:1, Frequency:1MHz, Supply Voltage Min:2.25V, Supply Voltage Max:5.5V, Digital IC Case Style:TSOT-23, No. of Pins:6, Operating Temperature Min:-40C, MSL:- , RoHS Compliant: Yes
LTC6992HS6-1#TRMPBF 功能描述:IC OSC SILICON 1MHZ TSOT23-6 RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 標(biāo)準(zhǔn)包裝:3,000 系列:- 類型:振蕩器 - 晶體 計數(shù):- 頻率:- 電源電壓:2.3 V ~ 5.5 V 電流 - 電源:1.07mA 工作溫度:-30°C ~ 80°C 封裝/外殼:SOT-665 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:SS迷你型-5D 安裝類型:表面貼裝 其它名稱:AN8955SSMTXLTR
LTC6992HS6-1#TRPBF 功能描述:IC OSC SILICON 1MHZ TSOT23-6 RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:TimerBlox® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝
LTC6992HS6-1-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:TimerBlox Voltage-Controlled Pulse Width Modulator (PWM)
LTC6992HS6-1-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:TimerBlox Voltage-Controlled Pulse Width Modulator (PWM)
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