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CS2842ALDR14 Datasheet(PDF) 7 Page - ON Semiconductor |
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CS2842ALDR14 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 10 page CS2842A, CS3842A, CS2843A, CS3843A http://onsemi.com 7 tc + RTCT ln VREF * Vlower VREF * Vupper td + RTCT ln VREF * IdRT * Vlower VREF * IdRT * Vupper Substituting in typical values for the parameters in the above formulas: VREF = 5.0 V Vupper = 2.7 V Vlower = 1.0 V Id = 8.3 mA tc ≈ 0.5534RTCT td + RTCT ln 2.3 * 0.0083RT 4.0 * 0.0083RT The frequency and maximum duty cycle can be determined using the Typical Performance Characteristic graphs. Grounding High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to GND pin in a single point ground. The transistor and 5.0 kΩ potentiometer, shown in the test circuit, are used to sample the oscillator waveform and apply and adjustable ramp to Sense. Figure 7. Oscillator Timing Network and Parameters Internal Clock Triangular Mode VOSC VOSC Internal Clock Small RT (≈ 700 kΩ) Large RT (≈ 10 kΩ) Sawtooth Mode Timing Parameters Vupper Vlower tc td VREF OSC GND RT CT |
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