TD8201中文资料White LED Step-up Converter数据手册Techcode规格书

描述 Description

The TD8201 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 TD8201 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 TD8201 is available in SOT23-6 packages.

特性 Features

l  Drives Up to 5 Series White LEDs from 3V
l  Up to 87% Efficiency
l  1.25MHz Fixed Switching Frequency
l  Low 104mV Feedback Voltage
l  Open Load Shutdown
l  PWM Dimming
l  SOT23-6 Packages

应用 Application

l  Cell Phones
l  Handheld Computers and PDAs
l  Digital Cameras