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UC2845ADW Arkusz danych(PDF) 6 Page - Texas Instruments |
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UC2845ADW Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 11 page 6 UC1842A/3A/4A/5A UC2842A/3A/4A/5A APPLICATIONS DATA (cont.) Open-Loop Laboratory Test Fixture Oscillator Section Oscillator Frequency vs Timing Resistance Maximum Duty Cycle vs Timing Resistor High peak currents associated with capacitive loads necessi- tate careful grounding techniques. Timing and bypass capaci- tors should be connected close to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sam- ple the oscillator waveform and apply an adjustable ramp to pin 3. Slope Compensation A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope compensation for converters requiring duty cycles over 50%. Note that capacitor, C, forms a filter with R2 to suppress the leading edge switch spikes. |
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