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参数资料
| 型号： | LTC3806EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 12-DFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 290kHz |
| 占空比： | 94% |
| 电源电压： | 10 V ~ 75 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3806
APPLICATIO S I FOR ATIO
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.
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:
– 1 ?
Composite Feedback
In applications where accuracy is important on more than
R 6 A =
R7 ? V OUT 1
?
K ? V REF
?
?
– 1 ?
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
R 6 B =
R 7 ? V OUT 2
1 – K ? ? V REF
?
?
composite feedback can be applied to two outputs.
This technique can easily be extended to more outputs if
OUT1
R6A
OUT2
R6B
needed.
Programming Turn-On and Turn-Off Thresholds
with the RUN Pin
R7
FB
The LTC3806 leaves a comparator detection circuit and
the voltage reference active even when the device is shut
3806 F02
Figure 2. Composite Feedback
+
R2
V IN
down (Figure 3). This allows users to accurately program
an input voltage at which the converter will turn on and off.
RUN
INPUT
RUN
6V
+
–
COMPARATOR
BIAS AND
START-UP
CONTROL
SUPPLY
OPTIONAL
FILTER
R1
CAPACITOR
1.230V
REFERENCE
–
GND
3806 F03a
Figure 3a. Programming the Turn-On and Turn-Off Thresholds Using the RUN Pin
+
V IN
RUN
COMPARATOR
INPUT
R2
1M
RUN
+
RUN
COMPARATOR
RUN
6V
+
SUPPLY
6V
–
EXTERNAL
LOGIC CONTROL
1.230V
–
–
GND
1.230V
3806 F03b
Figure 3b. On/Off Control Using External Logic
Figure 3c. External Pull-Up Resistor On
3806 F03c
RUN Pin for “Always On” Operation
3806fb
10
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相关代理商/技术参数 |
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|---|---|
| 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 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3808EDE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3808EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3808EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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