參數(shù)資料
型號： LTC6992IDCB6-3#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)： 6/32頁
文件大?。?/td> 322K
代理商： LTC6992IDCB6-3#TRPBF
LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
14
69921234p
OPERATION
The LTC6992 is built around a master oscillator with a
1MHz maximum frequency. The oscillator is controlled
by the SET pin current (ISET) and voltage (VSET), with a
1MHz 50k conversion factor that is accurate to ±0.8%
under typical conditions.
fMASTER =
1
tMASTER
= 1MHz 50k
ISET
VSET
A feedback loop maintains VSET at 1V ±30mV, leaving ISET
as the primary means of controlling the output frequency.
The simplest way to generate ISET is to connect a resistor
(RSET) between SET and GND, such that ISET = VSET/RSET.
The master oscillator equation reduces to:
fMASTER =
1
tMASTER
=
1MHz 50k
RSET
From this equation it is clear that VSET drift will not affect
the output frequency when using a single program resistor
(RSET). Error sources are limited to RSET tolerance and the
inherent frequency accuracy
ΔfOUT of the LTC6992.
RSET may range from 50k to 800k (equivalent to ISET
between 1.25μA and 20μA).
The LTC6992 includes a programmable frequency divider
which can further divide the frequency by 1, 4, 16, 64,
256, 1024, 4096 or 16384 before driving the OUT pin.
The divider ratio NDIV is set by a resistor divider attached
to the DIV pin.
fOUT =
1
tOUT
=
1MHz 50k
NDIV
ISET
VSET
With RSET in place of VSET/ISET the equation reduces to:
fOUT =
1
tOUT
=
1MHz 50k
NDIV RSET
DIVCODE
The DIV pin connects to an internal, V+ referenced 4-bit
A/D converter that monitors the DIV pin voltage (VDIV) to
determine the DIVCODE value. DIVCODE programs two
settings on the LTC6992:
1. DIVCODE determines the output frequency divider
setting, NDIV.
2. DIVCODE determines the output polarity, via the POL
bit.
VDIV may be generated by a resistor divider between V+
and GND as shown in Figure 1.
Figure 1. Simple Technique for Setting DIVCODE
6992 F01
LTC6992
V+
DIV
GND
R1
R2
2.25V TO 5.5V
相關(guān)PDF資料
PDF描述
LTC6992CDCB6-3#TRPBF SWITCHING CONTROLLER, PDSO6
LTC6992IDCB6-4#PBF SWITCHING CONTROLLER, PDSO6
LTC6992HDCB6-4#TRPBF SWITCHING CONTROLLER, PDSO6
LTC6992IDCB6-3#PBF SWITCHING CONTROLLER, PDSO6
LTC6992HDCB6-1#TRPBF SWITCHING CONTROLLER, PDSO6
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC6992IDCB6-4-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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LTC6992IS6-1#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® 標準包裝: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
LTC6992IS6-1#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 標準包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（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
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