Summary of 50V TO 5V @7A SYNCHRONOUS BUCK (STEP-DOWN) CONVERTER
This article describes a non-isolated 7A DC-DC converter module that steps down input voltages from 7V to 50V to a stable 5V output. The design utilizes the LM5116 Wide Range Synchronous Buck Controller IC, featuring current mode control with an emulated ramp for stability at high input voltages. It operates at a programmable frequency up to 1 MHz, specifically set to 250 KHz in this project, and includes adaptive dead-time control for external NMOS switches.
Parts used in the 50V TO 5V @7A SYNCHRONOUS BUCK CONVERTER:
- LM5116 Wide Range Synchronous Buck Controller IC
- 6uH toroid inductor
- N channel MOSFETS (two units)
This module is a non-isolated 7A DC-DC converter. The module can convert any DC voltage between 7V to 50V to a 5V DC with load current up to 7A. The project has been designed around LM5116 Wide Range Synchronous Buck Controller IC. The design includes 6uH toroid inductor and two N channel MOSFETS. The operating frequency is 250 KHz.
The LM5116 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 1 MHz and the LM5116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous operation mode, for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current.
Read more: 50V TO 5V @7A SYNCHRONOUS BUCK (STEP-DOWN) CONVERTER
- What voltage range can this converter handle?
The module converts any DC voltage between 7V to 50V. - How much load current does the project support?
The design supports a load current of up to 7A. - Does the controller use current mode control?
Yes, the control method is based upon current mode control utilizing an emulated current ramp. - Can the operating frequency be adjusted?
The operating frequency is programmable from 50 kHz to 1 MHz. - What type of power switches does the LM5116 drive?
The chip drives external high-side and low-side NMOS power switches. - Is there a mode for improved efficiency at light loads?
A user-selectable diode emulation mode enables discontinuous operation mode for improved efficiency. - How much current does the shutdown mode consume?
The low quiescent current shutdown consumes less than 10 µA of total input current.
