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LM25183-Q1 Datasheet(PDF) 9 Page - Texas Instruments |
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LM25183-Q1 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page LM25183-Q1 CIN CSS V IN NP : NS EN/UVLO VIN SW FB SS/BIAS GND TC RSET RFB VREF COMP Internal SS SAMPLED FEEDBACK FB 65-V Power MOSFET Standby Shutdown 1.1 V VDD VDD UVLO BIAS REGULATOR THERMAL SHUTDOWN SS/BIAS VDD VDD VIN 2.5 A ILIM TRIMMED REFERENCE RSET TC REGULATION RTC V OUT COUT DFLY CONTROL LOGIC 1.5 V 1.45 V gm 5 PA DF DZ 9 LM25183-Q1 www.ti.com SNVSBJ4 – APRIL 2020 Product Folder Links: LM25183-Q1 Submit Documentation Feedback Copyright © 2020, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM25183-Q1 primary-side regulated (PSR) flyback converter is a high-density, cost-effective solution for automotive and industrial systems requiring less than 15 W of isolated DC/DC power. This compact, easy-to-use flyback converter with low IQ can be applied over a wide input voltage range from 4.5 V to 42 V, with operation down to 3.5 V after start-up. Innovative frequency and current amplitude modulation enables high conversion efficiency across the entire load and line range. Primary-side regulation of the isolated output voltage using sampled values of the primary winding voltage eliminates the need for an opto-coupler or an auxiliary transformer winding for feedback. Regulation performance that rivals that of traditional opto-coupler solutions is achieved without the associated cost, solution size, and reliability concerns. The LM25183-Q1 converter services a wide range of applications including automotive on-board chargers and IGBT-based motor drives for HEV/EV systems. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Integrated Power MOSFET The LM25183-Q1 is a flyback dc/dc converter with integrated 65-V, 4.1-A N-channel power MOSFET. During the MOSFET on-time, the transformer primary current increases from zero with a slope of VIN / LMAG (where LMAG is the transformer primary-referred magnetizing inductance) while the output capacitor supplies the load current. When the high-side MOSFET is turned off by the control logic, the switch (SW) voltage VSW swings up to approximately VIN + (NPS × VOUT), where NPS = NP/NS is the primary-to-secondary turns ratio of the transformer. The magnetizing current flows in the secondary side through the flyback diode, charging the output capacitor and supplying current to the load. Duty cycle D is defined as tON / tSW, where tON is the MOSFET conduction time and tSW is the switching period. Figure 15 shows a typical schematic of the LM25183-Q1 PSR flyback circuit. Components denoted in red are optional depending on the application requirements. |
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