PT6973 is a boost DC/DC converter with one channel constant current regulator, which provides 10mA to 30mA current for up to 8 LEDs in series. The power supply is from 4V to 15V and the max output voltage is 28V. PT6973 provides both PWM dimming and analog dimming functions. The minimum PWM dimming on time is 125ns, which means 0.25% dimming duty-cycle at 20KHz is available.
PT6973 also provides much protections, such as under voltage lockout, cycle by cycle input current limit, output over voltage protection, flywheel diode open protection, feedback over voltage protection, thermal shutdown protection and so on.
PT6973 default operates at 600KHz. Furthermore, it can be synchronized by external clock for different frequency operation.