The LM5025 PWM controller contains all of the features necessary to implement power converters using the active clamp and reset technique. The device can be configured to control either a P-channel clamp switch or an N-channel clamp switch. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp and reset techniques.
Two control outputs are provided, the main power switch control (OUT_A), and the active clamp switch control (OUT_B). The active clamp output can be configured for either a specified overlap time (for P-channel switch applications) or a specified deadtime (for N_channel applications). The two internal compound gate drivers parallel both MOS and bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1 MHz and total PWM and current sense propagation delays less than 100 ns.
The LM5025 includes a high-voltage start-up regulator that operates over a wide input range of 13 V to 90 V. Additional features include: line undervoltage lockout (UVLO), soft-start, oscillator UP and DOWN sync capability, precision reference and thermal shutdown.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM5025 Active Clamp Voltage Mode PWM Controller datasheet (Rev. C) | PDF | HTML | Jan 14, 2016 |
| Selection guide | Power Management Guide 2018 (Rev. R) | Jun 25, 2018 | ||
| Technical article | Power Tips: A simple circuit to implement smooth soft start for an isolated conver | PDF | HTML | May 1, 2017 | |
| User guide | LM5025 Isolated Active Clamp Forward Converter Ref Design User Guide | Jan 27, 2012 | ||
| Application note | Operation and Benefits of Active-Clamp Forward Power Converters | Mar 22, 2007 | ||
| White paper | PWM DC-DC Cntrllrs w/Built-In Strt-Up Regs Simp Switch Pwr Supply Design | Oct 1, 2005 | ||
| Application note | Active Clamp Transformer Reset: High Side or Low Side? | Sep 17, 2004 | ||
| More literature | Seminar 1100 Topic 3 - Design Considerations for Active Clamp and Reset | Feb 15, 2001 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 16 | Ultra Librarian |
| WSON (NHQ) | 16 | Ultra Librarian |
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