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CS52845ED8 Fiches technique(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS52845ED8 Fiches technique(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 6 page Setting the Oscillator The times Tc and Td can be determined as follows: Grounding High peak currents associated with capacitive loads neces- sitate careful grounding techniques. Timing and bypass capacitors should be connected close to Gnd in a single point ground. The transistor and 5kΩ potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to Sense. 5 Vupper Vlower ton toff tc td ton=tc toff=tc+2td Circuit Description:: continued Substituting in typical values for the parameters in the above formulas: VREF = 5.0V, Vupper = 2.7V, Vlower = 1.0V, Id = 8.3mA, then tc ≈ 0.5534RTCT td = RTCT ln For better accuracy RT should be ≥10kΩ. ) 2.3 - 0.0083 RT 4.0 - 0.0083 RT ( VCC IO VO Switch Current EA Output Toggle F/F Output OSC RESET VOSC Figure 2: Timing Diagram Figure 3: Duty Cycle parameters. tc = RTCT ln td = RTCT ln ) VREF - IdRT - Vlower VREF - IdRT - Vupper ( ) VREF - Vlower VREF - Vupper ( |
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Description similaire - CS52845ED8 |
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