Our Ask An Expert knowledge base contains answers to questions from designers like you. Browse the knowledge base by category or search key words. Not seeing what you need? Ask An Expert a question of your own.
I was wondering if the NSI45020 can be used with PWM dimming frequency 19 kHz. What is the maximum frequency at which it can operate?
Yes, NSI45020AT1G can be used at 19k Hz. ON Semiconductor has run some application tests on the NSI45 family of Constant Current Regulators (CCR). A BJT with external resistors was used as part of the PWM circuit. Duty Cycle to the BJT was varied from 1% to 70% at 250 Hz and 20k Hz. The CCR regulated the current as expected and the LEDs operated as expected at both frequencies: As the % Duty Cycle increased, the measured Lux from the LEDs increased in a linear fashion.
Answered by: ON Semiconductor
2011-05-27 01:06:30.0