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TC170COE Datasheet(PDF) 9 Page - Microchip Technology |
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TC170COE Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 16 page  © 2002 Microchip Technology Inc. DS21395B-page 9 TC170 FIGURE 3-7: OSCILLATOR CIRCUIT 3.8 Oscillator Frequency and Output Dead Time The oscillator frequency for RO = 24kΩ and CO = 1000pF is: where: RO = Oscillator Resistor (Ω) CO = Oscillator Capacitor (F) FO = Oscillator Frequency (Hz) The oscillator resistor can range from 5k Ω to 50kΩ. Oscillator capacitor can range from 250pF to 1000pF. Figure 3-8 shows typical operation for various resistance and capacitance values. During transitions between the two outputs, simultaneous conduction is prevented. Oscillator fall time controls the output off, or dead time (Figure 3-7). Dead time is approximately: where: RO = Oscillator Resistor (kΩ) CO = Oscillator Capacitor (pF) TD = Output Dead Time (sec) Maximum possible duty cycle is set by the dead time. FIGURE 3-8: OSCILLATOR FREQUENCY VS. OSCILLATOR RESISTANCE 2.3V 4.3V ICHARGE ≈ 2.3V 8 9 1mA Discharge Current Sync 10 2.3V Pin 8 Pin 10 1 On-Time Output Dead Time (TD) + – FO VDD CO RO RO ROCO RO 2C O CO +150 x10 –12 FO= – 1.27 2800 CO [ ] 1– TD= 2000 [CO] ( ) 2.3 RO 50 45 40 35 30 25 20 15 10 5 0 20 40 60 80 100 120 140 160 180 200 250pF 500pF OSCILLATOR FREQUENCY (kHz) 750pF 1000pF TA = +25°C |
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Similar Description - TC170COE |
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