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Q&A Flash light frequency and rise time calculation

I was analyzing the design a hazard warning light.The spec of the light turn on off is given below. The flashing-light frequency shall be 90+/-30 times per minute. May I know in this case the...

1 answer  ·  posted 2mo ago by newbie‭  ·  last activity 2mo ago by Olin Lathrop‭

#2: Post edited by user avatar newbie‭ · 2024-04-25T15:43:28Z (about 2 months ago)
  • I was analyzing the design a hazard warning light.The spec of the light turn on off is given below.
  • > The flashing-light frequency shall be 90+/-30 times per minute.
  • May I know in this case the frequency(ignoring 30) will be 60/90Hz or 90/60Hz?
  • The designer used [this IC ](https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/led_driver/bd18327efv-m-e.pdf)to generate the PWM.
  • What will be the rise and fall time of the PWM coming from this IC
  • I was analyzing the design a hazard warning light.The spec of the light turn on off is given below.
  • > The flashing-light frequency shall be 90+/-30 times per minute.
  • _May I know in this case the frequency(ignoring 30) will be 60/90Hz or 90/60Hz?_
  • The designer used [this IC ](https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/led_driver/bd18327efv-m-e.pdf)to generate the PWM.
  • _What will be the rise and fall time of the PWM coming from this IC_
#1: Initial revision by user avatar newbie‭ · 2024-04-25T15:42:54Z (about 2 months ago)
Flash light frequency and rise time calculation
I was analyzing the design a hazard warning light.The spec of the light turn on off is given below.


 > The flashing-light frequency shall be 90+/-30 times per minute.

May I know in this case the frequency(ignoring 30) will be 60/90Hz or 90/60Hz?

The designer used [this IC ](https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/led_driver/bd18327efv-m-e.pdf)to generate the PWM.

What will be the rise and fall time of the PWM coming from this IC