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UC1844A-EP Scheda tecnica(PDF) 8 Page - Texas Instruments |
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UC1844A-EP Scheda tecnica(HTML) 8 Page - Texas Instruments |
8 / 11 page UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP CURRENT-MODE PWM CONTROLLER SGLS134B – SEPTEMBER 2002 – REVISED APRIL 2003 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5k potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3. Figure 7. Open-Loop Laboratory Text Fixture 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. Figure 8. Slope Complression |
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