Product Order Technical Tools & Support & Reference Folder Now Documents Software Community Design LM5180 SNVSB06D –JULY 2018–REVISED MAY 2020 LM5180 65-VIN PSR Flyback DC/DC Converter with 100-V, 1.5-A Integrated Power MOSFET 1 Features 2 Applications 1• Designed for reliable and rugged applications • Isolated field transmitters and field actuators – Wide input voltage range of 4.5 V to 65 V with • Multi-output rails for analog input modules operation down to 3.5 V after start-up • Motor drives: IGBT and SiC gate drive supplies – Robust solution with only one component • Building automation HVAC systems crossing the isolation barrier • Isolated bias supplies – ±1.5% total output regulation accuracy – Optional VOUT temperature compensation 3 Description – 6-ms internal or programmable soft start The LM5180 is a primary-side regulated (PSR) flyback converter with high efficiency over a wide – Input UVLO and thermal shutdown protection input voltage range of 4.5 V to 65 V. The isolated – Hiccup-mode overcurrent fault protection output voltage is sampled from the primary-side – –40°C to +150°C junction temperature range flyback voltage, eliminating the need for an • Integration reduces solution size and cost optocoupler, voltage reference, or third winding from the transformer for output voltage regulation. – Integrated 100-V, 0.4-Ω power MOSFET The high level of integration results in a simple, – No opto-coupler or transformer auxiliary reliable and high-density design with only one winding required for VOUT regulation component crossing the isolation barrier. Boundary – Internal loop compensation conduction mode (BCM) switching enables a compact • High-efficiency PSR flyback operation magnetic solution and better than ±1.5% load and line regulation performance. An integrated 100-V – Quasi-resonant MOSFET turn-off in BCM power MOSFET provides output power up to 7 W – Low input quiescent current with enhanced headroom for line transients. – External bias option for improved efficiency The LM5180 flyback converter is available in a 8-pin, – Single- and multi-output implementations 4-mm × 4-mm, thermally-enhanced WSON package • Ultra-low conducted and radiated EMI signatures with 0.8-mm pin pitch. – Soft switching avoids diode reverse recovery Device Information(1) – Optimized for CISPR 32 EMI requirements PART NUMBER PACKAGE BODY SIZE (NOM) • Create a custom regulator design using LM5180 WSON (8) 4.00 mm × 4.00 mm WEBENCH® Power Designer (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Typical Efficiency, VOUT = 5 V VIN = 4.5 V...65 V DFLY VOUT = 5 V 90 T1 85 DZ COUT 100 F C 3 : 1 80 IN VIN DF 2.2 F EN/UVLO SW 75 R LM5180 FB 158 k: GND FB (%) Efficiency 70 VIN = 12V RSET VIN = 24V V = 36V RSET 65 IN SS/BIAS V = 48V 12.1 k IN : V = 65V TC IN 60 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Output Current (A) 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. LM5180 SNVSB06D –JULY 2018–REVISED MAY 2020 www.ti.com Table of Contents 1 Features .................................................................. 1 8.4 Device Functional Modes........................................ 16 2 Applications ........................................................... 1 9 Application and Implementation ........................ 17 3 Description ............................................................. 1 9.1 Application Information............................................ 17 4 Revision History..................................................... 2 9.2 Typical Applications ................................................ 17 5 Description (continued)......................................... 3 10 Power Supply Recommendations ..................... 35 6 Pin Configuration and Functions ......................... 4 11 Layout................................................................... 36 7 Specifications......................................................... 5 11.1 Layout Guidelines ................................................. 36 7.1 Absolute Maximum Ratings ...................................... 5 11.2 Layout Examples................................................... 37 7.2 ESD Ratings.............................................................. 5 12 Device and Documentation Support ................. 38 7.3 Recommended Operating Conditions....................... 5 12.1 Device Support...................................................... 38 7.4 Thermal Information.................................................. 5 12.2 Documentation Support ........................................ 39 7.5 Electrical Characteristics........................................... 6 12.3 Receiving Notification of Documentation Updates 39 7.6 Typical Characteristics.............................................. 7 12.4 Support Resources ............................................... 39 8 Detailed Description ............................................ 10 12.5 Trademarks ........................................................... 39 8.1 Overview ................................................................. 10 12.6 Electrostatic Discharge Caution............................ 40 8.2 Functional Block Diagram ....................................... 10 12.7 Glossary ................................................................ 40 8.3 Feature Description................................................. 10 13 Mechanical, Packaging, and Orderable Information ........................................................... 40 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision C (April 2019) to Revision D Page • Added EMI bullet in Features ................................................................................................................................................. 1 • Added magnetic components in Table 3 ............................................................................................................................. 18 • Added expressions for UVLO turn-on/off voltage thresholds in Typical Applications .......................................................... 21 • Updated Layout Examples .................................................................................................................................................. 37 • Added PSR flyback converter family in Device and Documentation Support ...................................................................... 38 • Updated Documentation Support ......................................................................................................................................... 39 Changes from Revision B (February 2019) to Revision C Page • Changed EC table specs for current limit............................................................................................................................... 5 • Added note about failsafe current limit ................................................................................................................................. 15 Changes from Revision A (August 2018) to Revision B Page • Changed Vin-max to 65 V ...................................................................................................................................................... 1 • Added CISPR 25 class 5 EMI plots...................................................................................................................................... 23 Changes from Original (July 2018) to Revision A Page • Updated Features list; added an Application ......................................................................................................................... 3 • Deleted soft-start capacitor in Figure 23, Figure 38, and Figure 51 .................................................................................... 17 • Updated transformer part number in Table 2 ...................................................................................................................... 18 2 Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: LM5180 LM5180 www.ti.com SNVSB06D –JULY 2018–REVISED MAY 2020 5 Description (continued) The LM5180 flyback converter simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. Additional features include an internally-fixed or externally-programmable soft start, optional bias supply connection for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery. Copyright © 2018–2020, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM5180 LM5180 SNVSB06D –JULY 2018–REVISED MAY 2020 www.ti.com 6 Pin Configuration and Functions NGU Package 8-Pin WSON With Wettable Flanks Top View SW 1 8 GND FB 2 7 RSET VIN 3 6 TC EN/UVLO 4 5 SS/BIAS Pin Functions PIN I/O(1) DESCRIPTION NO. NAME Switch node that is internally connected to the drain of the N-channel power MOSFET. Connect 1 SW P to the primary-side switching terminal of the flyback transformer. Primary side feedback pin. Connect