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MP38875 Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP38875 Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 14 page MP38875 – 15A, 16V, 800kHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER MP38875 Rev. 0.9 www.MonolithicPower.com 7 11/20/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. FUNCTION BLOCK DIAGRAM IN EN FB SW VCC BG GND PG BST REGULATOR OSCILLATOR 800KHz DRIVER CURRENT SENSE AMPLIFIER ERROR AMPLIFIER CURRENT LIMIT COMPARATOR PWM COMPARATOR D REGULATOR REFERENCE -- + -- + -- + S R R Q Q COMP Power Good VFB VBG SS/TRK ISS VCC SYNCOUT SYNCIN VCC VBC VFB DRIVER Figure 2—Functional Block Diagram OPERATION The MP38875 is a fixed frequency, synchronous, step-down switching regulator with an integrated high-side power MOSFET and a gate driver for a low-side external MOSFET. It achieves 15A continuous output current over a wide input supply range with excellent load and line regulation. It provides a single highly efficient solution with current mode control for fast loop response and easy compensation. The MP38875 operates in a fixed frequency, peak current control mode to regulate the output voltage. A PWM cycle is initiated by the internal clock. The integrated high-side power MOSFET is turned on and remains on until its current reaches the value set by the COMP voltage. When the power switch is off, it remains off until the next clock cycle starts. If, in 90% of one PWM period, the current in the power MOSFET does not reach the COMP set current value, the power MOSFET will be forced to turn off. Error Amplifier The error amplifier compares the FB pin voltage with the internal 0.8V reference (REF) and outputs a current proportional to the difference between the two. This output current is then used to charge or discharge the external compensation network to form the COMP voltage, which is used to control the power MOSFET current. The optimized external compensation network minimizes the external component counts and simplifies the control loop design. See Application Information for compensation network design. |
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