A question for LM2907
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A question for LM2907

 
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deenhank



Joined: 21 Oct 2006
Posts: 2
Posted: Sat Oct 21, 2006 2:01 pm    Post subject: A question for LM2907 Reply with quote
I am use LM2907 to make a f/v circuit
but when the duty cycle of input signal is 50%
the output voltage is ok

but when duty cycle of input signal is 20%
the output voltage is different to duty cycle in 50%

IS the input signal's duty will affect the output voltage?

thanks

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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Sat Oct 21, 2006 9:33 pm    Post subject: Reply with quote
asume that 50% is x value for 50% then any decrease in duty cycle or decrease will result in more or less from your ref. point because there is power distrubution as %.
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deenhank



Joined: 21 Oct 2006
Posts: 2
Posted: Sun Oct 22, 2006 6:07 am    Post subject: Re: A question for LM2907 Reply with quote
deenhank wrote:
I am use LM2907 to make a f/v circuit
but when the duty cycle of input signal is 50%
the output voltage is ok

but when duty cycle of input signal is 20%
the output voltage is different to duty cycle in 50%

IS the input signal's duty will affect the output voltage?

thanks

-------------------------------------------------------------------------------------
but the LM2907 should be "one shot" ic
so the duty of input signal shouldn't affect the output voltage
but in effect the input duty will affect the output voltage
this is my question
thanks

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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Sun Oct 29, 2006 11:15 am    Post subject: Reply with quote
ok here is the deal if the oneshot latched then the output will time out normaly for the time set however if it is set up as re-trigable then it will try to restart its cycle responding to inputs.therefore different timing. now you nust decide which type you want and need.
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