The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha | |
|---|---|---|---|---|---|---|
| * | Hoja de datos | LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor datasheet (Rev. F) | PDF | HTML | 27/08/2015 | ||
| Informe | Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) | 10/04/2019 | ||||
| Informe | Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) | 3/07/2018 | ||||
| Nota sobre la aplicación | How to Design a Simple Constant Current/Constant Voltage Buck Converter | 26/06/2018 | ||||
| Guía de selección | Power Management Guide 2018 (Rev. R) | 25/06/2018 | ||||
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 21/07/2016 | ||||
| Analog Design Journal | Analog Applications Journal 3Q 2015 | 24/07/2015 | ||||
| Analog Design Journal | Ceramic or electrolytic output capacitors in DC/DC converters—Why not both? | 24/07/2015 |
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The LM25117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM25117 controller IC. The evaluation board provides 3.3V output with a 9A current capability in addition with average output current (...)
PMP10509 is a High-Efficiency Single-Phase Synchronous Buck Converter using the LM25117 controller IC. The design accepts an input voltage of 30.4Vin to 33.6Vin (32Vin Nominal) and provides an output of 24Vout capable of supplying 18A of continuous current to the load.
PMP10514 is a High-Efficiency Single-Phase Synchronous Buck Converter using the LM25117 controller IC. The design accepts an input voltage of 30.4Vin to 33.6Vin (32Vin Nominal) and provides an output of 20 Vout capable of supplying 15A of continuous current to the load.
PMP11114 is a dual port USB Type C Charger. This design takes an automotive input voltage (7V to 18V nominal, load dump to 40V). The output goes to two USB Type ports, each of these ports supplies 5V. The desgin supports 3A on one port and 1.5A on the other port. The DC/DC portion (...)
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
| HTSSOP (PWP) | 20 | Ultra Librarian |
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