Author Topic: Reading PWM spec - "garunteed off duty cycle"  (Read 645 times)

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Offline justinjjaTopic starter

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Reading PWM spec - "garunteed off duty cycle"
« on: March 21, 2019, 12:00:00 am »
I have the following spec for a pwm signal:
- 15-23 VDC at 67-93Hz or 127 to 199Hz
- 10% Guaranteed On and 5% Guaranteed Off Duty Cycle

What does that second part mean?
I'm guessing it menas the signal needs to be between 10% and 95% duty cycle?
 

Offline exe

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Re: Reading PWM spec - "garunteed off duty cycle"
« Reply #1 on: March 21, 2019, 07:40:01 am »
I don't know, but for me it seems that from 0-5% the device will be "off", 5-9% it will be in some non-guaranteed state, 10-100% is when it's gonna be "on"
 

Offline mikerj

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Re: Reading PWM spec - "garunteed off duty cycle"
« Reply #2 on: March 21, 2019, 08:41:51 am »
A little more context is need for the device this specification applies to to.  It sounds very much like the device is controlled by PWM, and whatever it controls is guaranteed to off with an applied PWM of 5% duty cycle and below, and guaranteed to be on with an applied duty cycle of 10% or higher. 

What happens in the 5-10% range is anyone's guess, probably the on/off switching threshold is simply somewhere in that range, but the device may have hysteresis built in causing a deadband.
 
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