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

atomar — Wed, 25 Jun 2014 00:53:05 GMT

Current Revision posted to Documents by atomar on 6/25/2014 12:53:05 AM

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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.

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Technical Documents

Learning Center

Type	Description
User Guide	TI: User Guide for LM5118 Evaluation Board
Datasheet	TI: Data Sheet for LM5118/LM5118Q Wide Voltage Range Buck-Boost Controller
Solution Guide	TI: Solution Guide for Point-of-Load (POL) Power Point-of-Load (POL) Power
Application Note	TI: AN-2178 - Application Note for LM5118 Four Switch Conversion

Design Elements

Type	Description
Reference Design	TI: Reference Design for PMP7773.1
Reference Design	TI: Reference Design for PMP7773.2
Application Library	TI: LM5118 Quick Start Component Calculator
Simulation Model	TI: PSpice Transient Model for LM5118
CAD Model	TI: CAD Model for LM5118

Video

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Kit Features

LM5118LM5118 Features:

Ultra-wide input voltage range from 3V to 75V
Emulated peak current mode control
Smooth transition between step-down and step- up modes
Switching frequency programmable to 500KHz
Oscillator synchronization capability
Internal high voltage bias regulator
Integrated high and low-side gate drivers
Programmable soft-start time
Ultra low shutdown current
Enable input wide bandwidth error amplifier
1.5% feedback reference accuracy
Thermal shutdown
Integrated high and low side driver
Internal high voltage bias regulator
Single inductor architecture
VOUT operation below and above VIN
Single resistor sets oscillator frequency
Ultra low (<10 μA) shutdown current
Wide bandwidth error amplifier
Adjustable output voltage 1.23V-75V
1.5% feedback reference accuracy
No VIN to VOUT connection during fault protection

Kit Contents

The Texas Instrument's LM5118EVAL/NOPBLM5118EVAL/NOPB Supplied with below contents:

LM5118EVAL/NOPBLM5118EVAL/NOPB LM5118LM5118 Evaluation Board

Tags: lm5118, lm5118eval/nopb, texas_instrument, lm5118eval, evaluation_board