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KA3842BD 데이터시트(PDF) 6 Page - Fairchild Semiconductor |
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6 / 12 page KA3842B/KA3843B/KA3844B/KA3845B 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 dis- charge 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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