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7440530047 データシート(PDF) 5 Page - Monolithic Power Systems |
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7440530047 データシート(HTML) 5 Page - Monolithic Power Systems |
5 / 9 page MP2359 – 1.2A, 24V, 1.4MHz STEP-DOWN CONVERTER IN A TSOT23-6 MP2359 Rev. 1.1 www.MonolithicPower.com 5 6/23/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. TM OPERATION The MP2359 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, M1 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 1.4MHz CLK signal sets the RS Flip-Flop. Its output turns on M1 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 the Current Sense Amplifier output and compared to the Error Amplifier output by the PWM Comparator. When the sum of the Current Sense Amplifier output and the Slope Compensation signal exceeds the EA output voltage, the RS Flip- Flop is reset and M1 is turned off. The external Schottky rectifier diode (D1) conducts the inductor current. If the sum of the Current Sense Amplifier output and the Slope Compensation signal does not exceed the EA output for a whole cycle, 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 0.81V bandgap reference. The polarity is such that a FB pin voltage lower than 0.81V increases the EA output voltage. Since the EA output voltage is proportional to the peak inductor current, an increase in its voltage also increases current delivered to the output. 5 IN EN FB GND SW BST 4 3 2 1 6 REGULATOR OSCILLATOR 1.4MHz/460KHz RAMP GENERATOR DRIVER CURRENT SENSE AMPLIFIER ERROR AMPLIFIER CURRENT LIMIT COMPARATOR PWM COMPARATOR D x20 M1 REGULATOR REFERENCE EA -- + -- + -- + S R R Q 27pF 1pF Figure 1—Functional Block Diagram |
同様の部品番号 - 7440530047 |
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同様の説明 - 7440530047 |
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