The LM34926 regulator features all of the functions needed to implement a low-cost, efficient, isolated bias regulator. This high-voltage regulator contains two 100-V N-channel MOSFET switches — a high-side buck switch and a low-side synchronous switch. The constant on-time (COT) control scheme employed in the LM34926 requires no loop compensation and provides excellent transient response. The regulator operates with an on-time control that is inversely proportional to the input voltage. This feature allows the operating frequency to remain relatively constant. An intelligent peak current limit is implemented with integrated sense circuit. Other features include a programmable input undervoltage comparator to inhibit operation during low-voltage conditions. Protection features include thermal shutdown and VCC Undervoltage Lockout (UVLO). The LM34926 device is offered in WSON-8 and SO PowerPAD-8 plastic packages.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM34926 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters datasheet (Rev. F) | PDF | HTML | 30 Nov 2017 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Analog Design Journal | Fly-Buck(TM) converter provides EMC and isolation in PLC applications | 29 Jan 2015 | ||
| Application note | AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) | 17 Dec 2014 | ||
| EVM User's guide | AN-2204 LM5017 Isolated Supply Evaluation Board (Rev. B) | 13 Aug 2013 | ||
| EVM User's guide | LM34926 Isolated Evaluation Board (Rev. A) | 25 Apr 2013 |
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An isolated bias supply is implemented in this evaluation board with LM34926 Constant-On-Time regulator. LM34926 regulator integrates both the high and low side power switch- es essential for creating isolated buck converter.
This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HSOIC (DDA) | 8 | Ultra Librarian |
| WSON (NGU) | 8 | Ultra Librarian |
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