PT4121

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