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发布者:来自网络 发布时间:2015-7-9 阅读:1572次    关键字: LED
PT4121-60V,Step-down LED Controller


PT4121-60V,Step-down High Brightness LED Controller with 2500:1 Dimming DataSheet 

PT4121_AN01

GENERAL DESCRIPTION
    The PT4121 is a high efficiency step-down
controller.It is designed to operate in continuous
conduction mode and drive single or multiple
series connected LED efficiently from a voltage
source higher than the total LED chain voltage. It
operates with a wide input voltage from 6V to 60V
and provides an externally adjustable output
current.
    The PT4121 includes a high-side output current
sense circuit, which uses an external resistor to set
the nominal average output current, and a
dedicated DIM input accepts either a DC voltage or
PWM dimming.
   The PT4121 is available in SOT23-6 packages.

FEATURES
 Simple low parts count
 Wide input voltage range: 6V to 60V
 High efficiency (up to 97%)
 Single pin on/off and brightness control using DC Voltage or PWM
 Up to 1MHz switching frequency
 Adjustable Constant LED Current
 Typical 3% output current accuracy
 High-Side Current Sense
 Hysteretic Control: No need compensation
 Inherent RCS open protection
 Inherent open-circuit LED protection
 Inherent short-circuit LED protection
 Thermal shutdown

APPLICATIONS
 Low voltage halogen replacement LEDs
 Automotive/Decorative lighting
 Low voltage industrial lighting
 LED back-up lighting
 Signs/Emergency lighting
 SELV lighting
 LCD TV backlighting

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