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SM74304 データシート(PDF) 1 Page - Texas Instruments |
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SM74304 データシート(HTML) 1 Page - Texas Instruments |
1 / 13 page 1 2 3 4 5 6 7 8 SW BST RCL FB RTN RON VCC VIN SM74304 www.ti.com SNVS720A – OCTOBER 2011 – REVISED APRIL 2013 SM74304 High Voltage (80V) Step Down Switching Regulator Check for Samples: SM74304 1 FEATURES PACKAGE 2 • Integrated 80V, 0.7A N-Channel Buck Switch • VSSOP-8 • Internal HV Vcc Regulator • WSON-8 (4mm x 4mm) • No Control Loop Compensation Required DESCRIPTION • Ultra-Fast Transient Response The SM74304 Step Down Switching Regulator • On Time Varies Inversely with Line Voltage features all of the functions needed to implement low • Operating Frequency Nearly Constant with cost, efficient, Buck bias regulators. This high voltage Varying Line Voltage regulator contains an 80 V, 0.7A N-Channel Buck Switch. The device is easy to apply and is provided in • Adjustable Output Voltage the VSSOP-8 and the thermally enhanced WSON-8 • Highly Efficient Operation packages. The regulator is based on a hysteretic • Precision Reference control scheme using an on time inversely proportional to VIN. This feature allows the operating • Low Bias Current frequency to remain relatively constant with load and • Intelligent Current Limit Protection input voltage variations. The hysteretic control • Thermal Shutdown requires no control loop compensation, while providing very fast load transient response. An • External Shutdown Control intelligent current limit is implemented in the SM74304 with forced off time that is inversely TYPICAL APPLICATIONS proportional to VOUT. This current limiting scheme • Non-Isolated Buck Regulator reduces load current foldback. Additional protection features include: Thermal Shutdown, Vcc • Secondary High Voltage Post Regulator undervoltage lockout, gate drive undervoltage • Photovoltaic Systems lockout, and Max Duty Cycle limiter. Connection Diagram Figure 1. 8-Lead VSSOP, WSON 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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同様の説明 - SM74304 |
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