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LM34927SD 데이터시트(PDF) 1 Page - Texas Instruments |
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LM34927SD 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 26 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 LM34927 CVCC + D2 9V-100V 1 2 3 4 5 6 8 7 LM34927 www.ti.com SNVS799F – APRIL 2012 – REVISED DECEMBER 2013 LM34927 Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters Check for Samples: LM34927 1 FEATURES APPLICATIONS 2 • Wide 7.5 V to 100 V Input Range • Isolated Telecom Bias Supply • Integrated 100 V, High and Low Side Switches • Isolated Automotive and Industrial Electronics • No Schottky Required DESCRIPTION • Constant On-Time Control The LM34927 regulator features all of the functions • No Loop Compensation Required needed to implement a low cost, efficient, isolated • Ultra-Fast Transient Response bias regulator. This high voltage regulator contains two 100V N-Channel MOSFET switches - a high-side • Nearly Constant Operating Frequency buck switch and a low-side synchronous switch. The • Intelligent Peak Current Limit Constant-on-time (COT) control scheme employed in • Adjustable Output Voltage From 1.225 V the LM34927 requires no loop compensation and provides excellent transient response. The regulator • Precision 2% Feedback Reference operates with an on-time that is inversely proportional • Frequency Adjustable to 1 MHz to the input voltage. This feature allows the operating • Adjustable Undervoltage Lockout (UVLO) frequency to remain relatively constant. An intelligent • Remote Shutdown peak current limit is implemented with integrated sense circuit. Other features include a programmable • Thermal Shutdown input under voltage comparator to inhibit operation • Packages: during low-voltage conditions. Protection features – WSON-8 include thermal shutdown and VCC Undervoltage Lockout (UVLO). The LM34927 is offered in WSON-8 – SO PowerPAD-8 and SO PowerPAD-8 plastic packages. Typical Application Figure 1. Typical Application Schematic 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 © 2012–2013, 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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