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MP2494DS Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP2494DS Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 11 page MP2494 –2A, 55V, 100kHz STEP-DOWN CONVERTER MP2494 Rev. 1.0 www.MonolithicPower.com 7 4/25/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. OPERATION Main Control Loop The MP2494 is a current mode buck regulator. That is, the EA output voltage is proportional to the peak inductor current. At the beginning of a cycle SW is off; the EA output voltage is higher than the current sense amplifier output; and the current comparator’s output is low. The rising edge of the 100kHz CLK signal sets the RS Flip-Flop. Its output turns on SW thus connecting the SW pin and inductor to the input supply. The increasing inductor current is sensed and amplified by the Current Sense Amplifier. Ramp compensation is summed to Current Sense Amplifier output and compared to the Error Amplifier output by the Current Comparator. When the Current Sense Amplifier plus Slope Compensation signal exceeds the EA output voltage, the RS Flip-Flop is reset and the MP2494 reverts to its initial SW off state. If the Current Sense Amplifier plus Slope Compensation signal does not exceed the COMP voltage, then the falling edge of the CLK resets the Flip-Flop. The output of the Error Amplifier integrates the voltage difference between the feedback and the 0.8V bandgap reference. The polarity is such that an FB pin voltage lower than 0.8V increases the EA output voltage. Since the EA output voltage is proportional to the peak inductor current, an increase in its voltage increases current delivered to the output. An external Schottky Diode (D1) carries the inductor current when SW is off. Enable Control The MP2494 has an Enable control pin (EN). Drive EN above 1.8V to turn on the MP2494. Drive EN below 0.4V to turn it off. Tie EN to VIN for automatic start up. |
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