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MC33066P Folha de dados(PDF) 6 Page - ON Semiconductor |
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MC33066P Folha de dados(HTML) 6 Page - ON Semiconductor |
6 / 11 page MC34066, MC33066 http://onsemi.com 6 The maximum oscillator frequency is set by resistor RVFO in a similar fashion using Equations 1 and 3 in Equation 5: = tdchg(min) + tchg (5) 1 fOSC(max) The value chosen for resistor RDT will affect the peak voltage of the oscillator waveform. As RDT is increased from zero, the time required to charge COSC becomes large with respect to the propagation delay through the oscillator comparator. Consequently, the overshoot of the upper threshold is reduced and the peak voltage on the oscillator waveform drops from 5.1 V to 4.9 V. The best frequency accuracy is achieved when RDT is zero ohms. One−Shot Timer The One−Shot capacitor CT is charged concurrently with the oscillator capacitor by transistor Q1, as shown in Figure 3. The One−Shot period begins when the oscillator comparator turns off Q1, allowing CT to discharge. The period ends when resistor RT discharges CT to the threshold of the One−Shot comparator. Discharging CT from an initial voltage of 5.1 V to a threshold voltage of 3.6 V results in the One−Shot period given by Equation 6. tOS = RT CT In (6) 5.1 3.6 = 0.348 RT CT |
Nº de peça semelhante - MC33066P |
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Descrição semelhante - MC33066P |
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