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CS3842A Datasheet(PDF) 5 Page - Cherry Semiconductor Corporation |
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CS3842A Datasheet(HTML) 5 Page - Cherry Semiconductor Corporation |
5 / 6 page 5 former saturation in some power supplies, the internal oscillator waveform provides the maximum duty cycle clamp as programmed by the selection of oscillator com- ponents. Setting the Oscillator Oscillator timing capacitor, CT, is charged by VREF through RT and discharged by an internal current source. During the discharge time, the internal clock signal blanks out the output to the Low state, thus providing a user selected maximum duty cycle clamp. Charge and discharge times are determined by the formula: tc = RTCT ln td = RTCT ln Substituting in typical values for the parameters in the above formulas: VREF = 5.0V, Vupper = 2.7V, Vlower = 1.0V, Id = 8.3mA tc ≈ 0.5534RTCT td = RTCT ln The frequency and maximum duty cycle can be deter- mined using the Typical Performance Characteristic graphs. Grounding High peak currents associated with capacitive loads neces- sitate careful grounding techniques. Timing and bypass capacitors should be connected close to Gnd pin in a sin- gle point ground. The transistor and 5kΩ potentiometer, shown in the test circuit, are used to sample the oscillator waveform and apply an adjustable ramp to Sense. ) 2.3 - 0.0083 RT 4.0 - 0.0083 RT ( ) VREF - IdRT - Vlower VREF - IdRT - Vupper ( ) VREF - Vlower VREF - Vupper ( VREF OSC Gnd RT CT Circuit Description: continued VOSC Internal Clock LARGE RT (≈10kΩ) VREF Internal Clock SMALL RT (≈700kΩ) Sawtooth Mode Triangular Mode Vupper Vlower tc td VCC IOUT VOUT Switch Current EA Output VOSC OSC RESET Figure 2: Timing Diagram for key CS2841B parameters Figure 3: Oscillator Timing Network and parameters Timing parameters |
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Similar Description - CS3842A |
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