PT4108 Datasheet

时间: 2009-06-26 来源: Seawin 浏览量:

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   Boost High Brightness LED Driver
GENERAL DESCRIPTION
The PT4108 is a compact, high efficient, and low voltage step-up high brightness LED driver with an Adaptive Current Mode PWM control loop. It comprises of an error amplifier, a ramp generator, a PWM comparator, a switch pass element and driver. It provides stable and high efficient operation over a wide range of load currents. It operates in stable waveforms without external compensation. The low start-up input voltage below 1V makes it suitable for 1~4 battery cells. The 500KHz high switching rate reduces the size of external components. Besides, the 25A low quiescent current together with high efficiency maintains long battery lifetime. The output current set by the external high precision resistor.
FEATURES
¨          Low Quiescent (Switch-off) Supply Current: 25A
¨          Low Start-up Input Voltage: 1.0V
¨          High efficiency: 86%
¨          Fixed switching frequency: 500KHz
APPLICATIONS
¨          Portable Lighting
¨          Flashlights
TYPICAL APPLICATIONS