Also, the LM3405A is capable of providing a 600 mA constant current to drive high brightness LEDs from a 12V AC source. Thanks to the wide operating voltage range of the LM3405A (from 3VDC to 20VDC), a very small input capacitor can maintain continuous operation. Switching frequency is internally set to 1.6 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. All these factors help to squeeze the overall dimensions of the PCB to fit the stringent space constraints of the MR16 form factor making the LM3405A the ideal LED driver for this application.