Texas Instrument: LM5118EVAL/NOPB Evaluation Board for LM5118 Wide Voltage Range Buck-Boost Controller

The LM5118LM5118 evaluation board (LM5118EVAL/NOPBLM5118EVAL/NOPB) is designed to provide the design engineer with a fully functional, Emulated Current Mode Control, buck-boost power converter to evaluate the multiProductLinkLM5118 controller IC.

• The evaluation board provides a 12V output with 3A of output current capability.
• The evaluation board's wide input voltage range is from 75V to 5V, with operation down to 3V with some component changes.
• The evaluation board operates at 300 kHz, a good compromise between conversion efficiency, tradeoffs between buck and buck-boost mode requirements, and converter size. The printed circuit board consists of 4 layers with 2 ounce copper top and bottom, and 1 ounce copper on internal layers. The board is constructed with FR4 material. The application note contains the evaluation board schematic, Bill-of-Materials (BOM) and a quick setup procedure.

The LM5118LM5118 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement    a high performance, cost efficient Buck-Boost regulator using a minimum of external components.The Buck-Boost topology maintains    output voltage regulation when the input voltage is either less than or greater than the output voltage making it especially suitable for automotive applications.

The LM5118LM5118 operates as a buck regulator while the input voltage is sufficiently greater    than the regulated output voltage and gradually transitions to the buck-boost mode as the input voltage approaches the output. 

This dual mode approach maintains regulation over a wide range of input voltages with optimal conversion efficiency in the    buck mode and a glitch-free output during mode transitions.

This easy to use controller includes drivers for the high side    buck MOSFET and the low side boost MOSFET. The regulator’s control method is based upon current mode control utilizing an    emulated current ramp. Emulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing    reliable control of the very small duty cycles necessary in high input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input.

Key Applications: Power Management.