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LM34925 Datasheet(PDF) 1 Page - Texas Instruments |
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LM34925 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 27 page + + + + VIN BST RON RTN SW VCC FB UVLO VIN VOUT1 VOUT2 RFB1 RUV1 RON COUT1 CBST D1 CIN COUT2 RFB2 RUV2 X1 Rr NP NS LM34925 CVCC + D2 7.5V-100V 1 2 3 4 5 6 8 7 Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design LM34925 SNVS846F – JUNE 2012 – REVISED NOVEMBER 2014 LM34925 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters 1 Features 3 Description The LM34925 regulator features all of the functions 1 • Wide 7.5-V to 100-V Input Range needed to implement a low cost, efficient, isolated • Integrated 100-mA High-Side, bias regulator. This high voltage regulator contains and Low-Side Switches two 100-V N-Channel MOSFET switches: a high-side • No Schottky Required buck switch and a low-side synchronous switch. The constant-on-time (COT) control scheme employed in • Constant On-Time Control the LM34925 device requires no loop compensation • No Loop Compensation Required and provides excellent transient response. The • Ultra-Fast Transient Response regulator operates with an on-time that is inversely proportional to the input voltage. This feature allows • Nearly Constant Operating Frequency the operating frequency to remain relatively constant. • Intelligent Peak Current Limit An intelligent peak current limit is implemented with • Adjustable Output Voltage From 1.225 V integrated sense circuit. Other features include a • Precision 2% Feedback Reference programmable input under voltage comparator to inhibit operation during low-voltage conditions. • Frequency Adjustable to 1 MHz Protection features include thermal shutdown and • Adjustable Undervoltage Lockout (UVLO) VCC Undervoltage Lockout (UVLO). The LM34925 • Remote Shutdown device is offered in 8-pin WSON and 8-pin SO PowerPAD plastic packages. • Thermal Shutdown • Packages: Device Information(1) – 8-Pin WSON PART NUMBER PACKAGE BODY SIZE (NOM) – 8-Pin SO PowerPAD™ SO PowerPAD (8) 4.89 mm × 3.90 mm LM34925 WSON (8) 4.00 mm × 4.00 mm 2 Applications (1) For all available packages, see the orderable addendum at • Isolated Telecom Bias Supply the end of the data sheet. • Isolated Automotive and Industrial Electronics Typical Application Schematic 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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