TTP933

Preliminary TTP933 1.5A LED Driver with internal switch 2013/08/23 Page 1—25 Ver. 1.2 Preliminary TTP933 .General Description TTP933 is a high efficiency , constant current , continuous mode inductive step-down converter, designed for driving constant current to high power (single or multiple) LED with only 4 external components. TTP933 operates from input supply between 5V and 33V and provides an externally adjustable output current of up to 1.5A. The TTP933 is specifically designed with PFM control to enhance the efficiency up to 97%. The Output current can be modify by an external resister , and can adjusted , by applying an external control signal to the DIM pin , The DIM pin will accept a PWM waveform. Additionally, to ensure the system reliability, TTP933 is built-in with over temperature protection, and LED open-circuit short-circuit protection to protect system from being damaged. .Features — 1.5A output current — Wide input voltage range: 5V to 33V — High efficiency (up to 97%) — Internal NDMOS power switch — Single pin on/off and brightness control using PWM — Hysteretic PFM improves efficiency at light loads — With Thermal/Soft start /LED open-short detect protection — Only 4 External Components — Up to 1Mhz switching frequency — Typical 3% output current accuracy .Applications z High power LED lighting z Automotive LED lighting z Low voltage industrial lighting z LED back-up lighting z Constant Current Source 2013/08/23 Page 2—25 Ver. 1.2 Preliminary...