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TC170CPE Datasheet(PDF) 7 Page - TelCom Semiconductor, Inc |
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TC170CPE Datasheet(HTML) 7 Page - TelCom Semiconductor, Inc |
7 / 8 page 4-125 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 CMOS CURRENT MODE PWM CONTROLLER TC170 Figure 6 . Oscillator Circuit Figure 7. Oscillator Frequency vs Oscillator Resistance where: RO = Oscillator Resistor (kΩ) CO = Oscillator Capacitor (pF) TD = Output Dead Time (sec) Maximum possible duty cycle is set by the dead time. 50 45 40 35 30 25 20 15 10 5 0 20 40 60 80 100 120 140 160 180 200 TA = +25°C 250pF 500pF OSCILLATOR FREQUENCY (kHz) 750pF 1000pF 2.3V 4.3V I CHARGE 2.3V RO 8 CO 9 1 mA DISCHARGE CURRENT SYNC 10 VDD 2.3V PIN 8 PIN 10 1 ON-TIME OUTPUT DEAD TIME (TD) + – RO FO TD = 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 5 k Ω to 50 kΩ. Oscillator capacitor can range from 250 pF to 1000 pF. Figure 7 shows typical operation for various resistance and capacitance values. During transitions between the two outputs, simulta- neous conduction is prevented. Oscillator fall time controls the output off, or dead time (Figure 6). Dead time is approximately: ] [ FO = 1.27 2800 CO ROCO RO 2C O CO + 150 × 10 –12 2000 [CO] 1 – ( ) 2.3 RO |
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