PT4121
50V，Step-down High Brightness
LED Controller
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 50V 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.
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FEATURES
l Simple low parts count
l Wide input voltage range: 6V to 50V
l High efficiency (up to 97%)
l Single pin on/off and brightness control using DC Voltage or PWM
l Up to 1MHz switching frequency
l Adjustable Constant LED Current
l Typical 3% output current accuracy
l High-Side Current Sense
l Hysteretic Control: No need compensation
l Inherent RCS open protection
l Inherent open-circuit LED protection
l Inherent short-circuit LED protection
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l Thermal shutdown
PTPLICATIONS
l Low voltage halogen replacement LEDs l Automotive/Decorative lighting
l Low voltage industrial lighting l LED back-up lighting
l Signs/Emergency lighting l SELV lighting
l LCD TV backlighting