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LM2619ATLX датащи(PDF) 9 Page - National Semiconductor (TI) |
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LM2619ATLX датащи(HTML) 9 Page - National Semiconductor (TI) |
9 / 15 page Device Information (Continued) PWM OPERATION While in PWM (Pulse Width Modulation) mode, the output voltage is regulated by switching at a constant frequency and then modulating the energy per cycle to control power to the load. Energy per cycle is set by modulating the PFET switch on-time pulse-width to control the peak inductor cur- rent. This is done by comparing the signal from the current-sense amplifier with a slope compensated error sig- nal from the voltage-feedback error amplifier. At the begin- ning of each cycle, the clock turns on the PFET switch, causing the inductor current to ramp up. When the current sense signal ramps past the error amplifier signal, the PWM comparator turns off the PFET switch and turns on the NFET synchronous rectifier, ending the first part of the cycle. If an increase in load pulls the output voltage down, the error amplifier output increases, which allows the inductor current to ramp higher before the comparator turns off the PFET. This increases the average current sent to the output and adjusts for the increase in the load. Before going to the PWM comparator, the error signal is summed with a slope compensation ramp from the oscillator for stability of the current feedback loop. During the second part of the cycle, a zero crossing detector turns off the NFET synchronous rectifier if the inductor current ramps to zero. The minimum on time of the PFET in PWM mode is about 200ns. 20057407 FIGURE 5. Simplified Functional Diagram PWM Mode Switching Waveform 20057425 A: Inductor Current, 500mA/div B: SW Pin, 2V/div C: VOUT, 10mV/div, AC Coupled FIGURE 6. www.national.com 9 |
Аналогичный номер детали - LM2619ATLX |
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Аналогичное описание - LM2619ATLX |
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