LM2743-19AEVAL National Semiconductor, LM2743-19AEVAL Datasheet

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LM2743-19AEVAL

Manufacturer Part Number
LM2743-19AEVAL
Description
BOARD EVALUATION LM2743-19A
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets
1.LM2743MTCNOPB.pdf (26 pages)
2.LM2743-19AEVAL.pdf (8 pages)

Specifications of LM2743-19AEVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.2 ~ 3.3V
Current - Output
19A
Voltage - Input
8 ~ 14V
Regulator Topology
Buck
Frequency - Switching
300kHz
Board Type
Fully Populated
Utilized Ic / Part
LM2743
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
© 2007 National Semiconductor Corporation
LM2743-19A Demo Board
Introduction
This application notes describes the LM2743 printed circuit
board (PCB) design and provides an example typical appli-
cation circuit. The LM2743 is a voltage mode PWM buck
controller which implements synchronous rectification. It pro-
vides a low cost, high power density, and efficient point of load
solution. In steady state operation the LM2743 is always syn-
chronous, even at no load, thus simplifying the compensation
design. The current limit protection does not require a current
limit resistor in the power path, but is achieved by sensing the
voltage V
sections of the IC are rated for 3 to 6V (V
tions are designed to accept input supply rails (V
as 16V.
Specifics Of The Board
This demo board targets the fixed and mobile telecommuni-
cations, industrial electronics, and distributed power markets.
The demo board has a V
regulator, the LP2937, powers V
voltage. The LM2743 regulates to an output range of 1.2V to
3.3V at 19A with a switching frequency of 300 kHz. Note, the
demo board is optimized for the above parameters, thus for
additional design modifications refer to the Design Consider-
ation section of the LM2743 data sheet. The PCB is designed
on four layers, the top and bottom layers are 2oz. copper and
the two inner layers are 1oz. copper. The board measures
2.19 in. x 1.03 in. x 0.41 in. (56 mm x 26.2 mm x 10.3 mm) (l,
w, h) on a FR4 laminate.
Feature Options
When the tracking feature of the LM2743 is required for use,
remove the jumper that connects the soft-start capacitor C10
and connect the resistor divider, on designators R13 and R14,
see Figure 1. The Track terminal has been provided for your
connecting convenience. The demo board switching frequen-
DS
across the low side MOSFET. Though the control
IN
range of 8V to 14V and a LDO
CC
by regulating a 5V output
300224
CC
), the driver sec-
IN
) as high
National Semiconductor
Application Note 1640
Ricardo Capetillo
May 2007
cy is user adjustable; note increasing the switching frequency
results in a lower inductor current ripple and input and output
voltage ripple (if the component values are the same). Monitor
the MOSFET junction temperature since switching losses will
increase, and do not exceed the maximum junction temper-
ature of the MOSFET. Refer to the MOSFET manufacturer
datasheet for maximum junction temperature specification
and heat sinking guidelines.
Specification Summary
•
•
•
•
•
•
•
•
•
•
•
•
Space saving footprint
Wide ambient temperature range: -40 ºC to 65 ºC
Input voltage range: 8V to 14V
Adjustable output voltage: 1.2V to 3.3V
No minimum load requirement
Remote ON/OFF
Power good signal
Fixed switching frequency: 300 kHz
Current Limit Protection
Master power supply start-up tracking function
Adjustable soft-start
Small size 2.19 in. x 1.03 in. x 0.41 in. (56 mm x 26.2 mm
x 10.3 mm)
FIGURE 1. Soft-Start and Tracking Jumper
www.national.com
30022417

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LM2743-19AEVAL Summary of contents

Page 1

... Design Consider- ation section of the LM2743 data sheet. The PCB is designed on four layers, the top and bottom layers are 2oz. copper and the two inner layers are 1oz. copper. The board measures 2 ...

Page 2

Performance Characteristics Efficiency Switch Node Voltage and Output Voltage Ripple FIGURE 8V 100 mA, f LOAD SW 20 MHz Bandwidth Limit www.national.com FIGURE 2. Efficiency vs. Load Current V = 3.3V ...

Page 3

FIGURE 14V OUT I = 100 mA 300 kHz LOAD SW 20 MHz Bandwidth Limit Load Transient Response FIGURE 14V OUT 10A LOAD CH1: ...

Page 4

... Bill of Materials for LM2743 POL EVB (Vin 14V, Vout:3.3V, 19A) Location Part Number U1 LM2743 U2 LM27937IMP-5.0 L1 SER2010-202ML Q1-2 IRF6633 Q3 IRF6609 D1 SL22-E3/2C D2 MBRS0520 C1, 2 GRM32ER61C226KE20L C3, 11 GRM319R71H104KA01B C14 GRM319R71H474KA01B C9 GRM1885C1H1210JA01 C6 GRM188R71H222KA01 C8 GRM188R71H332KA01 C10 GRM188R71H153KA01 C12 GRM40X7R472K25 C13 12066D226MAT C4, 5 6SVPC220M R1,18 CRCW06030R00F R2 CRCW06032151F ...

Page 5

FIGURE 11. 300 kHz Demo Board Schematic 5 30022406 www.national.com ...

Page 6

PCB Layout www.national.com FIGURE 12. Top Silkscreen FIGURE 13. Top Copper Layer FIGURE 14. Bottom Silkscreen 6 30022411 30022412 30022413 ...

Page 7

FIGURE 15. Bottom Copper Layer FIGURE 16. Internal Layer-1 (GND Copper) FIGURE 17. Internal Layer-2 (GND Copper) 7 30022414 30022415 30022416 www.national.com ...

Page 8

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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