TL494: Frequency configuration

Michiaki Tanii

Part Number: TL494

Referring 9.3.2 Oscillator, the equation is f = 1/(RT x CT) but TYP frequency is 10kHz at CT = 0.01uF, RT = 12k ohm in the 7.6 Electrical Characteristics, Oscillator Section.

Could you kindly advise how customer should consider the frequency configuration ?

Thank you and best regards,

Michiaki

over 5 years ago

0 John Griffin1 over 5 years ago

TI__Mastermind 34465 points

Hello Michiaki,

This is some anomaly in the datasheet that goes all through revisions from Rev A to the present Rev H.
Please use the curves in Figure 1 or the equation 3 in the datasheet to calculate the oscillator frequency.

Thank you for pointing out this anomaly and I will try to find out why the test circuit uses a 12k resistor for Rt instead of a 10k.
Regards

John

0 Michiaki Tanii over 5 years ago in reply to John Griffin1

TI__Expert 4610 points

Hi John,

> I will try to find out why the test circuit uses a 12k resistor for Rt instead of a 10k.

Regarding on the above, could you kindly update latest situation ?

Thank you and best regards,

Michiaki

0 John Griffin1 over 5 years ago in reply to Michiaki Tanii

TI__Mastermind 34465 points

Hello Michiaki,

I will let you know when I have an update

Regards

John

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TL494: Frequency configuration