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SS23 数据表(PDF) 4 Page - Monolithic Power Systems |
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SS23 数据表(HTML) 4 Page - Monolithic Power Systems |
4 / 10 page MP1580 – 2A, 380KHz STEP-DOWN CONVERTER MP1580 Rev. 3.0 www.MonolithicPower.com 4 12/5/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM OPERATION The MP1580 is a current mode regulator; the COMP pin voltage is proportional to the peak inductor current. At the beginning of a cycle: the upper transistor M1 is off; the lower transistor M2 is on (refer to Figure 1); the COMP pin voltage is higher than the current sense amplifier output and the current comparator’s output is low. The rising edge of the 380KHz CLK signal sets the RS Flip-Flop. Its output turns off M2 and 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 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 COMP pin voltage, the RS Flip-Flop is reset and the MP1580 reverts to its initial M1 off, M2 on, 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 1.222V bandgap reference. The polarity is such that an FB pin voltage less than 1.222V increases the COMP pin voltage. Since the COMP pin voltage is proportional to the peak inductor current, an increase in its voltage increases the current delivered to the output. The lower 10Ω switch ensures that the bootstrap capacitor voltage is charged during light load conditions. An external Schottky Diode D1 carries the inductor current when M1 is off (see Figure 1). MP1580_BD01 LOCKOUT COMPARATOR ERROR AMPLIFIER FREQUENCY FOLDBACK COMPARATOR INTERNAL REGULATORS 1.8V SLOPE COMP CLK CURRENT COMPARATOR CURRENT SENSE AMPLIFIER SHUTDOWN COMPARATOR COMP 6 IN 2 EN 7 SYNC 8 GND 4 OSCILLATOR 40/380kHz S R Q SW 3 BS 1 5V + Q 0.7V + + 2.285V/ 2.495V + 1.222V 0.7V + + FB 5 -- -- -- -- -- -- Figure 1—Functional Block Diagram |
类似零件编号 - SS23 |
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类似说明 - SS23 |
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