LMZ14202EVAL/NOPB National Semiconductor, LMZ14202EVAL/NOPB Datasheet

LMZ14202EVAL/NOPB

Manufacturer Part Number

LMZ14202EVAL/NOPB

Description

EVAL BOARD FOR LMZ14202

Manufacturer

National Semiconductor

Datasheet

1.LMZ14203EVALNOPB.pdf (10 pages)

Specifications of LMZ14202EVAL/NOPB

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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LMZ1420x / LMZ1200x

Evaluation Board

Introduction

The LMZ1420x and LMZ1200x SIMPLE SWITCHER® power

modules are easy-to-use DC-DC solution capable of driving

up to a 3A load with exceptional power conversion efficiency,

output voltage accuracy, line and load regulation. They are

available in an innovative package that enhances thermal

performance and allows for hand or machine soldering.

The LMZ14203/2/1 can accept an input voltage rail between

6V and 42V and the LMZ12003/2/1 can accept an input volt-

age rail between 4.5V and 20V. The devices can deliver an

adjustable and highly accurate output voltage as low as 0.8V

and as high as 6V. The control structure is constant on-time

with input voltage feed forward. This creates a nearly constant

switching frequency across the input voltage range. The con-

trol loop operates well with low ESR output capacitors such

as ceramics. An output feed-forward capacitor across the up-

per feedback resistor trims for optimum transient response.

The precision enable input allows for programmable UVLO of

the input supply. The external soft-start capacitor facilitates

controlled startup output rise time. The LMZ1420x and

LMZ1200x family is a reliable and robust solution with the fol-

lowing features: lossless cycle-by-cycle valley current limit to

protect for over current or short-circuit fault, thermal shut-

down, input under-voltage lock-out, and will start up into a pre-

biased output.

(LMZ12003 1.8V application values shown in parentheses)

301122

FIGURE 1. Evaluation Board Schematic

National Semiconductor

Application Note 2024

Alan Martin

March 26, 2010

Board Specifications

•

For additional circuit modifications refer to the Design Con-

sideration section of the LMZ1420x or LMZ1200x data sheet.

For negative output voltage connections see AN-2027.

Additional Footprints

Additional component mounting pads are available to exper-

iment with alternative Cin and Cout combinations or a zener

clamp on the enable input. See Figure 6 for corresponding

schematic locations.

LMZ1420x V

LMZ1420x enable UVLO = 8V

LMZ1420x V

LMZ1200x V

LMZ1200x enable UVLO = 4.5V

LMZ1200x V

Operates at full load up to 80°C ambient at 12V input

Designed on four layers, all four layers are 1 oz. copper

weight

The two internal ground planes are identical

Measures 1.705 in. x 3.03 in. (4.33 cm x 7.7cm) and is

62mil (.062”) thick of FR4 laminate material

= 20°C / W, θ

OUT

= 6V to 42V

= 4.5V to 20V

= 3.3V

= 1.8V

= 1.9°C / W

30112201

www.national.com

Related parts for LMZ14202EVAL/NOPB

LMZ14202EVAL/NOPB Summary of contents

Page 1

... National Semiconductor Corporation National Semiconductor Application Note 2024 Alan Martin March 26, 2010 Board Specifications • ...

Page 2

TABLE 1. LMZ1420x Bill of Materials, V Designator Description U1 SIMPLE SWITCHER® µF, X7R, 50V IN4 µF, X5R, 50V IN2 C 100 µF, X5R, 6. 0.022 µF, X7R, 100V ...

Page 3

LMZ14203 Efficiency 30112202 LMZ14202 Efficiency 30112220 LMZ14201 Efficiency 30112222 LMZ12003 Efficiency LMZ12002 Efficiency LMZ12001 Efficiency 3 30112203 30112221 30112223 www.national.com ...

LMZ14203 Thermal Derating LMZ14202 Thermal Derating LMZ14201 Thermal Derating www.national.com LMZ12003 Thermal Derating 30112215 LMZ12002 Thermal Derating 30112224 LMZ12001 Thermal Derating 30112226 4 30112216 30112225 30112227 ...

Page 5

LMZ14203 Current Limit V = 3.3V OUT 30112228 LMZ14202 Current LimitV = 3.3V OUT 30112230 LMZ14201 Current Limit V = 3.3V OUT 30112232 LMZ12003 Current Limit V LMZ12002 Current Limit V LMZ12001 Current Limit 1.8V OUT 30112229 ...

Page 6

LMZ14203 Startup V LMZ14203 Output Ripple 3A 200 MHz OUT PCB Layout Diagrams Gerber and CAD files can be download from the LMZ14203 product folder. www.national.com = 12V IN 30112234 = 3.3V LMZ14203 Transient Response ...

Page 7

FIGURE 3. Internal Layer I (Ground) Heat Sinking Layer FIGURE 4. Internal Layer II (Ground) Heat Sinking Layer FIGURE 5. Bottom Layer (Ground and Routing) Heat Sinking Layer 7 30112210 30112211 30112212 www.national.com ...

Page 8

FIGURE 6. LMZ14203 PCB CAD package schematic DNS = Component not installed 8 30112213 ...

Page 9

Notes 9 www.national.com ...

Page 10

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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