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发布者:微桥PT4103 发布时间:2010-1-9 阅读:6047次    关键字: PT4103
PT4103-White LED Step-Up Converter SOT23-6 0VP30V


PT4103-White LED Step-Up Converter PDF文档下载

PT4103:

     小尺寸SOT23-6封装

     输出具有30V过压保护

     工作电压为2.5-6V

     恒流驱动白光LED

     输入电压2.5V时可驱动3V的白光LED 五颗串联

     输入电压3.6V时可驱动3V的白光LED 八颗串联

     效率高达87%

     1.2MHZ固定的开关频率

     超低的0.104V的采样电压

     负载开路关断功能

     软启动功能

 

GENERAL DESCRIPTION
The PT4103 is a step-up DC/DC converter designed for driving up to 8 white LEDs in series from a single cell Lithium Ion battery with constant current. Because it directly regulates output current, the PT4103 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals. A single external resistor sets LED current between 5mA and 20mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. Its low 104mV feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The PT4103 is available in SOT23-6  packages.
 
FEATURES

l          Drives Up to 5 Series White LEDs from 2.5V

l          Drives Up to 8 Series White LEDs from 3.6V

l          Up to 87% Efficiency

l          1.2MHz Fixed Switching Frequency

l          Low 104mV Feedback Voltage

l          Open Load Shutdown

l          Soft Start/PWM Dimming

l          SOT23-6 Packages

 

APPLICATIONS

l          Cell Phones

l          Handheld Computers and PDAs

l          Digital Cameras

l          Small LCD Displays

 

TYPICAL APPLICATIONS    

 

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