參數(shù)資料
型號： LTC3806EDE
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Synchronous Flyback DC/DC Controller
中文描述： 0.05 A SWITCHING CONTROLLER, 290 kHz SWITCHING FREQ-MAX, PDSO12
封裝： 4 X 3 MM, PLASTIC, MO-229WGED, DFN-12
文件頁數(shù)： 10/20頁
文件大?。?/td> 241K
代理商： LTC3806EDE
10
LTC3806
3806f
APPLICATIOU
Cross regulation and tracking between the master and slave
outputs are impacted by transformer and secondary-side
power MOSFET selection. Select a power MOSFET with
low on resistance. In addition, a transformer with low
winding resistances and highest coupling coefficient will
have better cross regulation and tracking.
W
U
U
Composite Feedback
In applications where accuracy is important on more than
one output, composite feedback may be used. This sacri-
fices some of the accuracy of one output for improved
accuracy on the other output(s). Figure 2 shows how
composite feedback can be applied to two outputs.
Select a value for R7 less than or equal to 120k. Now
choose the fraction K of the total feedback taken from
V
OUT1
. The higher the fraction used, the tighter V
OUT1
is
controlled, but the poorer V
OUT2
is controlled (since it
contributes less to the total feedback). The values for R6A
and R6B can now be calculated:
R A
6
R
K
R
1
V
V
R B
6
K
V
V
OUT
REF
OUT
REF
7
1
7
1
1
2
=
=
–
–
–
This technique can easily be extended to more outputs if
needed.
Programming Turn-On and Turn-Off Thresholds
with the RUN Pin
The LTC3806 leaves a comparator detection circuit and
the voltage reference active even when the device is shut
down (Figure 3). This allows users to accurately program
an input voltage at which the converter will turn on and off.
R7
3806 F02
R6B
FB
R6A
OUT1
OUT2
Figure 2. Composite Feedback
–
+
RUN
COMPARATOR
V
IN
RUN
R2
R1
INPUT
SUPPLY
OPTIONAL
FILTER
CAPACITOR
+
–
GND
3806 F03a
BIAS AND
START-UP
CONTROL
1.230V
REFERENCE
6V
–
+
RUN
COMPARATOR
1.230V
3806 F03b
RUN
6V
EXTERNAL
LOGIC CONTROL
–
+
RUN
COMPARATOR
V
IN
RUN
R2
1M
INPUT
SUPPLY
+
–
GND
1.230V
3806 F03c
6V
Figure 3a. Programming the Turn-On and Turn-Off Thresholds Using the RUN Pin
Figure 3b. On/Off Control Using External Logic
Figure 3c. External Pull-Up Resistor On
RUN Pin for “Always On” Operation
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3806EDE#PBF 功能描述:IC REG CTRLR FLYBACK PWM 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3806EDE#TR 功能描述:IC REG CTRLR FLYBACK PWM 12-DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3806EDE#TRPBF 功能描述:IC REG CTRLR FLYBACK PWM 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3808EDE 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 2.75V to 9.8V Input 14-Pin DFN EP
LTC3808EDE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 14-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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