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UC3845 Datenblatt(PDF) 6 Page - Fairchild Semiconductor |
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UC3845 Datenblatt(HTML) 6 Page - Fairchild Semiconductor |
6 / 12 page UC3842/UC3843/UC3844/UC3845 6 Figure 5. Oscillator Waveforms and Maximum Duty Cycle Oscillator timing capacitor, CT, is charged by VREF through RT and discharged by an internal current source. During the discharge time, the internal clock signal blanks the output to the low state. Selection of RT and CT therefore determines both oscillator frequency and maximum duty cycle. Charge and discharge times are determined by the formulas: tc = 0.55 RT CT Frequency, then, is: f=(tc + td) -1 Figure 8. Shutdown Techniques Figure 6. Oscillator Dead Time & Frequency Figure 7. Timing Resistance vs Frequency t D R TCTIn 0.0063R T 2.7 – 0.0063R T 4 – ---------------------------------------- = ForRT 5K Ω f 1.8 R TCT --------------- = , > (Deadtime vs CT RT > 5kΩ) |
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