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参数资料
| 型号： | LTC3803MPS6#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件页数： | 15/16页 |
| 文件大小： | 164K |
| 代理商： | LTC3803MPS6#TRPBF |
LTC3803
8
3803fc
OPERATION
The undervoltage lockout (UVLO) mechanism prevents the
LTC3803 from trying to drive a MOSFET with insufcient
VGS. The voltage at the VCC pin must exceed VTURNON
(nominally 8.7V) at least momentarily to enable LTC3803
operation. The VCCvoltageisthenallowedtofalltoVTURNOFF
(nominally 5.7V) before undervoltage lockout disables the
LTC3803. This wide UVLO hysteresis range supports the
use of a bias winding on the yback transformer to power
the LTC3803—see the section Powering the LTC3803.
The ITH/RUN pin can be driven below VITHSHDN(nominally
0.28V) to force the LTC3803 into shutdown. An internal
0.3μA current source always tries to pull this pin towards
VCC. When the ITH/RUN pin voltage is allowed to exceed
VITHSHDN, and VCC exceeds VTURNON, the LTC3803 begins
to operate and an internal clamp immediately pulls the
ITH/RUN pin up to about 0.7V. In operation, the ITH/RUN
pin voltage will vary from roughly 0.7V to 1.9V to represent
current comparator thresholds from zero to maximum.
Internal Soft-Start
An internal soft-start feature is enabled whenever the
LTC3803 comes out of shutdown. Specically, the ITH/
RUN voltage is clamped and is prevented from reaching
maximum until roughly 1.4ms has passed. This allows
the input and output currents of LTC3803-based power
supplies to rise in a smooth and controlled manner on
start-up.
Powering the LTC3803
In the simplest case, the LTC3803 can be powered from
a high voltage supply through a resistor. A built-in shunt
regulator from the VCC pin to GND will draw as much
current as needed through this resistor to regulate the
VCC voltage to around 9.5V as long as the VCC pin is not
forced to sink more than 25mA. This shunt regulator is
always active, even when the LTC3803 is in shutdown,
since it serves the vital function of protecting the VCC pin
from seeing too much voltage.
For higher efciency or for wide VIN range applications,
yback controllers are typically powered through a separate
bias winding on the yback transformer. The LTC3803 has
the wide UVLO hysteresis and small VCC supply current
draw that is needed to support such bootstrapped hysteretic
start-up schemes.
The VCC pin must be bypassed to ground immediately
adjacent to the IC pins with a minimum of a 10μF ceramic
or tantalum capacitor. Proper supply bypassing is neces-
sary to supply the high transient currents required by the
MOSFET gate driver.
Adjustable Slope Compensation
The LTC3803 injects a 5μA peak current ramp out through
its SENSE pin which can be used for slope compensation in
designs that require it. This current ramp is approximately
linear and begins at zero current at 6% duty cycle, reach-
ing peak current at 80% duty cycle. Additional details are
provided in the Applications Information section.
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相关代理商/技术参数 |
参数描述 |
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| LTC3805EDD#PBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3805EDD#TRPBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN 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) |
| LTC3805EDD-5#PBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN 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) |
| LTC3805EDD-5#PBF | 制造商:Linear Technology 功能描述:IC, FLYBACK/ BOOST/SEPIC CTRL, DFN-10 |
| LTC3805EDD-5#TRPBF | 功能描述:IC REG CTRLR BST FLYBK PWM 10DFN 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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