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LM5160 Datasheet(PDF) 11 Page - Texas Instruments |
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LM5160 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page FB VIN VCC SW AGND BST 2.0V VILIM LM5160 RON CURRENT LIMIT COMPARATOR + - VCC UVLO ON/OFF TIMERS CONSTANT ON-TIME CONTROL LOGIC 1.24V VCC REGULATOR VIN FEEDBACK COMPARATOR DISABLE THERMAL SHUTDOWN EN/UVLO STANDBY SHUTDOWN BIAS REGULATOR 0.35V 20µA VCC FPWM SS CURRENT LIMIT TIMER PGND VIN GM ERROR AMP DIODE EMULATION VIN RESR COUT VOUT VOUT CIN RON L CBST CVCC CSS RUV2 RUV1 RFB2 RFB1 11 LM5160A, LM5160 www.ti.com SNVSA03C – OCTOBER 2014 – REVISED AUGUST 2016 Product Folder Links: LM5160A LM5160 Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM5160 family of step-down switching regulators features all the functions needed to implement a low-cost, efficient buck converter capable of supplying 2 A to the load. This high voltage regulator contains 65-V N-channel buck and synchronous rectifier switches and is available in the 12-pin WSON package. The regulator operation is based on constant ON-time control where the ON-time is inversely proportional to input voltage VIN. This feature maintains a relatively constant operating frequency with load and input voltage variations. A constant ON-time switching regulator requires no loop compensation resulting in fast load transient response. Peak current limit detection circuit is implemented with a forced OFF-time during current limiting which is inversely proportional to voltage at the feedback pin, VFB and directly proportional to VIN. Varying the current limit OFF-time with VFB and VIN ensures short-circuit protection with minimal current limit foldback. The LM5160 can be applied in numerous end equipment systems requiring efficient step-down regulation from higher input voltages. This regulator is well suited for 24-V industrial systems as well as 48-V Telecom and PoE voltage ranges. The LM5160 integrates an undervoltage lockout (EN/UVLO) circuit to prevent faulty operation of the device at low input voltages and features intelligent current limit and thermal shutdown to protect the device during overload or short circuit. The LM5160 device name is used generically throughout this document and represents both the LM5160 and LM5160A unless stated otherwise. The only difference between the two is the ability to connect an external voltage source to the VCC pin of the LM5160A. 7.2 Functional Block Diagram |
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