LM5118EVAL National Semiconductor, LM5118EVAL Datasheet

Buck-Boost Controller Eval. Board

LM5118EVAL

Manufacturer Part Number
LM5118EVAL
Description
Buck-Boost Controller Eval. Board
Manufacturer
National Semiconductor
Datasheet

Specifications of LM5118EVAL

Silicon Manufacturer
National
Application Sub Type
Buck/Boost Controller
Kit Application Type
Power Management - Voltage Regulator
Silicon Core Number
LM5118
© 2008 National Semiconductor Corporation
LM5118 Evaluation Board
Introduction
The LM5118 evaluation board is designed to provide the de-
sign engineer with a fully functional, Emulated Current Mode
Control, buck-boost power converter to evaluate the LM5118
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 op-
erates at 300 kHz, a good compromise between conversion
efficiency, tradeoffs between buck and buck-boost mode re-
quirements, 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. This application note contains the evalua-
tion board schematic, Bill-of-Materials (BOM) and a quick
setup procedure. Refer to the LM5118 data sheet and quick
start for more complete circuit and design information.
300575
FIGURE 1.
National Semiconductor
Application Note 1819
Ron Crews
April 30, 2008
IC Features
Package
TSSOP-20EP (Exposed Pad)
Integrated high and low side driver
Internal high voltage bias regulator
Ultra-wide input voltage range: 5V to 75V
Emulated current mode control
Single inductor architecture
VOUT operation below and above VIN
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 1.23V-75V
1.5% feedback reference accuracy
Thermal Shutdown
No VIN to VOUT connection during fault protection
30057501
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Related parts for LM5118EVAL

LM5118EVAL Summary of contents

Page 1

... FR4 material. This application note contains the evalua- tion board schematic, Bill-of-Materials (BOM) and a quick setup procedure. Refer to the LM5118 data sheet and quick start for more complete circuit and design information. © 2008 National Semiconductor Corporation National Semiconductor Application Note 1819 Ron Crews ...

Page 2

FIGURE 2. Efficiency Figure 2 illustrates the efficiency of the converter vs. input voltage and output current. These curves highlight the high efficiency of the converter, especially considering the simplic- ity of design offered by a non synchronous implementation. Note ...

Page 3

FIGURE 4. Short Circuit Current VCCX A place for a jumper between VOUT and VCCX is provided on the PC board. If operation below about 6 volts is required, connect the jumper to allow VCCX to power the converter (the ...

Page 4

Typical Waveforms CH1 20V/div SW CH2 20V/div CH3 10V/div CH4 5A/div L FIGURE 6. Vin = 10V, Iout = 1A, illustrating Buck-Boost Operation CH1 20V/div SW CH2 20V/div ...

Page 5

Evaluation Board 5 www.national.com ...

Page 6

Qty Reference Value 2 C1, C2 2.2 µF, 100V, X7R 3 C3, C4, C5 2.2 µF, 100V, X7R 2 C6, C8 0.1 µF, 100V, X7R 2 C7, C20 1 µf, 25V, X7R 2 C9, C10 47 µF, 16V, X5R 2 ...

Page 7

Schematic and Layout Top Silkscreen Layer as Viewed from Top Top Layer as Viewed from Top Layer 2 as Viewed from Top 30057511 Layer 3 as Viewed from Top 30057512 Bottom Layer as Viewed from Top 30057513 Bottom Silkscreen Layer ...

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Drills and Dimensions as Viewed from Top 8 30057517 ...

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9 www.national.com ...

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