LMZ10505EVAL/NOPB National Semiconductor, LMZ10505EVAL/NOPB Datasheet

LMZ10505EVAL/NOPB

Manufacturer Part Number

LMZ10505EVAL/NOPB

Description

EVAL BOARD FOR LMZ10505

Manufacturer

National Semiconductor

Datasheet

1.LMZ10504EVAL.pdf (12 pages)

Specifications of LMZ10505EVAL/NOPB

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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LMZ1050x Evaluation Board

Introduction

The LMZ1050x SIMPLE SWITCHER® power module is a

complete, easy-to-use DC-DC solution capable of driving up

to 3A, 4A, or 5A load with exceptional power conversion effi-

ciency, output voltage accuracy, line and load regulation. The

LMZ1050x is available in an innovative package that en-

hances thermal performance and allows for hand or machine

soldering.

The LMZ1050x can accept an input voltage rail between

2.95V and 5.5V and deliver an adjustable and highly accurate

output voltage as low as 0.8V. One megahertz fixed frequen-

cy PWM switching provides a predictable EMI characteristic.

Two external compensation components can be adjusted to

set the fastest response time, while allowing the option to use

ceramic and/or electrolytic output capacitors. Externally pro-

grammable soft-start capacitor facilitates controlled startup.

The LMZ1050x is a reliable and robust solution with the fol-

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

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

down, input under-voltage lock-out, and pre-biased startup.

Board Specifications

•

±2.5% feedback voltage accuracy at 2.5V output

(Including line and load regulation from T

±1.63% feedback voltage accuracy over temperature

Designed on four layers, the top and bottom layers are

1oz. copper and the two inner layers are 1/2 oz. copper

weight

Measures 2.25 in. x 2.25 in. (5.8 cm x 5.8 cm) and is 62mil

(.062”) thick on a FR4 laminate

OUT

for other output settings)

= 2.95V to 5.5V

= 20°C / W, θ

= 0A to 3A, 4A, and 5A

= 2.5V (default output voltage setting, refer to

= 1.9°C / W

301113

= -40°C to 125°

Table

National Semiconductor

Application Note 2022

Ricardo Capetillo

August 12, 2010

Evaluation Board Design Concept

The evaluation board is designed to demonstrate low con-

ducted noise on the input and output lines, as seen in

output capacitors (C

All the input and output filter capacitors are not necessary to

comply with radiation standards. For a circuit example that

passes radiated emissions standards (EN55022, class B)

please refer to

duce the resonance of the input line produced by the induc-

tance and resistance in the cables connecting the bench

power supply to the evaluation board and the input capacitors.

Additional Component Footprints

When the tracking feature of the LMZ1050x is used, remove

the soft-start capacitor C

ignators R

provided for easy connection.

The LMZ1050x eval board incorporates a precision enable

circuit which is pulled high by a 100 kΩ pull up resistor to VIN.

This allows the user to pull low on the enable pin to ground.

The top enable resistor is R

is R

tion section of the LMZ1050x data sheet for detailed design

implementation.

Select FPGAs specify input inrush currents for particular pow-

er-up sequences and others require sequencing rails to avoid

start-up or latch-up problems. To prevent early turn-on of the

LMZ1050x in systems with multiple power rails, precision en-

able and tracking are useful as the main input voltage rail rises

at power-up.

and

enb

. Refer to the Design Guideline and Operating Descrip-

Figure

trkb

and R

14. Four input capacitors (C

Figure

trkt

. The ground and V

19. Additionally, C

- C

and use a resistor divider on des-

ent

) are populated for this purpose.

and the bottom enable resistor

in5

in1

trk

- C

is present to re-

post have been

www.national.com

in4

) and three

Figure

Related parts for LMZ10505EVAL/NOPB

LMZ10505EVAL/NOPB Summary of contents

Page 1

... Measures 2.25 in. x 2.25 in. (5 5.8 cm) and is 62mil (.062”) thick on a FR4 laminate © 2010 National Semiconductor Corporation National Semiconductor Application Note 2022 Ricardo Capetillo August 12, 2010 Evaluation Board Design Concept ...

Page 2

Component Circuit Schematic FIGURE 1. Component Schematic for Evaluation Board TABLE 1. Bill of Materials for Evaluation Board, V Designator Description U1 SIMPLE SWITCHER® µF, X7R, 16V in1 4.7 µF, X5R, 6.3V in2 O1 C ...

Page 3

Complete Circuit Schematic FIGURE 2. Complete Evaluation Board Schematic 30111324 3 www.national.com ...

Page 4

Connection Diagram Efficiency vs. Load Current LMZ10504 & LMZ10505, V OUT www.national.com FIGURE 3. Efficiency Measurement Setup FIGURE 4. Output Voltage Ripple Measurement Setup = 2.5V 25°C AMB 30111328 4 30111315 30111316 Efficiency vs. Load Current LMZ10503, V ...

Page 5

Performance Characteristics FIGURE 5. Current Derating vs. Ambient Temperature = 5.0V, θ LMZ10503 FIGURE 6. Current Derating vs. Ambient Temperature = 5.0V, θ LMZ10504 FIGURE 7. Current Derating vs. Ambient Temperature = 5.0V, θ ...

Page 6

FIGURE 11. Output Voltage Ripple 2.5V OUT OUT LMZ10503 / LMZ10504 / LMZ10505 FIGURE 12. Load Transient Response V = 5.0V OUT LMZ10503 400 mA to 2.7A, 20 MHz ...

Page 7

FIGURE 17. Load Transient Response V = 5.0V 2.5V IN OUT LMZ10505 500 mA to 4.5A, 20 MHz Bandwidth Limit OUT 30111335 FIGURE 18. Load Transient Response LMZ10505, I OUT 7 30111334 V = 3.3V, V ...

Page 8

Circuit Example: Complies with EN55022 Class B Radiated Emissions FIGURE 19. Component Schematic, V Designator Description U1 SIMPLE SWITCHER® µF, X7R, 16V in1 C 4.7 µF, X5R, 6.3V in2 C 47 µF, X5R, 6.3V in3 C 100 µF, ...

Page 9

FIGURE 22. Radiated Emissions (EN55022, Class 5V 2.5V OUT OUT Tested on LMZ10505 Evaluation Board 30111327 = 5A 9 www.national.com ...

Page 10

PCB Layout Diagram www.national.com FIGURE 23. Top Layer FIGURE 24. Internal Layer I (Ground) 10 30111307 30111308 ...

Page 11

FIGURE 25. Internal Layer II (Ground) FIGURE 26. Bottom Layer 11 30111311 30111313 www.national.com ...

Page 12

... 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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