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发布者:微桥PT4101LED 发布时间:2010-1-9 阅读:5380次    关键字: PT4101
PT4101-White LED Step-Up Converter


PT4101-White LED Step-Up Converter PDF文档下载

 PT4101:

     小尺寸SOT23-6封装

     输出具有20V过压保护

     工作电压为3-5.5V

     恒流驱动白光LED

     可驱动3V的白光LED 五颗串联

     效率高达87%

     1.25MHZ固定的开关频率

     超低的0.104V的采样电压

     可实现PWM亮度控制

     广泛应用于消费类产品,手机,PDA的背光驱动

GENERAL DESCRIPTION
 
The PT4101 is a step-up DC/DC converter designed for driving up to 5 white LEDs in series from a single cell Lithium Ion battery with constant current. Because it directly regulates output current, the PT4101 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 2mA and 20mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal up to 100KHz. 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 PT4101 is available in SOT23-6 packages.
 
FEATURES
 

¨          Drives Up to 5 Series White LEDs from 3V

¨          Up to 87% Efficiency

¨          1.25MHz Fixed Switching Frequency

¨          Low 104mV Feedback Voltage

¨          Open Load Shutdown

¨          PWM Dimming

¨          SOT23-6 Packages
 
APPLICATIONS
 

¨          Cell Phones

¨          Handheld Computers and PDAs

¨          Digital Cameras

¨          Small LCD Displays
 
TYPICAL APPLICA TIONS

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