data/text/DLP2/891261

TL494: Frequency configuration

Part Number: TL494 Hi 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

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

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

Hello Michiaki, I will let you know when I have an update Regards John