The LM34925 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 LM34925 device requires no loop compensation and provides excellent transient response. The regulator operates with an on-time 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 under voltage comparator to inhibit operation during low-voltage conditions. Protection features include thermal shutdown and VCC undervoltage lockout (UVLO). The LM34925 device is offered in 8-pin WSON and
8-pin SO PowerPAD plastic packages.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM34925 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters datasheet (Rev. G) | PDF | HTML | 20 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 | LM34925 Isolated Evaluation Board (Rev. A) | 23 Apr 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
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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