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User's Guide
SNVA334B–April 2008–Revised January 2014
AN-1819 LM5118 Evaluation Board
1 Introduction
The LM5118 evaluation board is designed to provide the design engineer with a fully functional, Emulated
Current Mode Control, buck-boost power converter to evaluate the LM5118 controller IC. The evaluation
board provides a 12 V output with 3 A of output current capability. The evaluation board’s wide input
voltage range is from 75 V to 5 V, with operation down to 3 V 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 board is constructed with FR4
material. This user's guide contains the evaluation board schematic and Bill of Materials (BOM).
Refer to the LM5118 quick start (SNVU065) and for more complete circuit and design information, see
Wide Voltage Range Buck-Boost Controller (SNVS566).
The performance of the evaluation board is:
• Input Range: 75 V to less than 5 V at full current
• Operation to 3 V at reduced current and appropriate adjustments. Operation at full current to around 3
V is possible with current limit sense resistor, UVLO threshold, and corresponding C
ramp
adjustment.
Additional input capacitance may be required. See the LM5118 datasheet (SNVS566) and quick start
(SNVU065) for more details.
• Output Voltage: 12 V
• Output Current: 0 to 3 A
• Frequency of Operation: 300 kHz
• Board Size: 3.45 × 2.65 inches
• Load Regulation: 1%
• Line Regulation: 0.1%
• Over-Current Limiting
• Operation with V
IN
greater or less than V
OUT
2 IC Features
• Integrated high and low side driver
• Internal high voltage bias regulator
• Ultra-wide input voltage range: 5 V to 75 V
• Emulated current mode control
• Single inductor architecture
• V
OUT
operation below and above V
IN
• Single resistor sets oscillator frequency
• Oscillator synchronization capability
• Programmable soft-start
• Ultra low (<10 µA) shutdown current
• Enable input
• Wide bandwidth error amplifier
• Adjustable output voltage 1.23 V to 75 V
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1
SNVA334B–April 2008–Revised January 2014 AN-1819 LM5118 Evaluation Board
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- ・ Blockdiagramm on Seite 11
- ・ Anwendungsbereich on Seite 15 Seite 16
