LM22680EVAL/NOPB National Semiconductor, LM22680EVAL/NOPB Datasheet

LM22680EVAL/NOPB

Manufacturer Part Number

LM22680EVAL/NOPB

Description

BOARD EVAL FOR LM22680

Manufacturer

National Semiconductor

Series

PowerWise®r

Datasheets

1.LM22680MRE-ADJNOPB.pdf (16 pages)

2.LM22680EVALNOPB.pdf (6 pages)

Specifications of LM22680EVAL/NOPB

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Voltage - Output

3.3V

Current - Output

500mA

Voltage - Input

4.5 ~ 42 V

Regulator Topology

Buck

Frequency - Switching

500kHz

Board Type

Fully Populated

Utilized Ic / Part

LM22680

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Other names

LM22680EVAL
LM22680EVAL

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM22680EVAL/NOPB

Manufacturer:

National Semiconductor

Quantity:

135

Current page: 1 of 6
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LM22680 Evaluation Board

Introduction

The LM22680 evaluation board is designed to demonstrate

the capabilities of the LM22680 switching regulator. The

LM22680 evaluation board schematic shown in

configured to provide an output voltage of 3.3V up to 2A load

current with an input voltage range of 4.5V to 42V. Due to the

low R

mum duty-cycle limitations, the minimum input voltage of 4.5V

will only provide a 3.3V output voltage for load currents up to

500 mA. For load currents higher than 500 mA, an input volt-

age of 5.5V or higher is required. The typical operating fre-

quency is 500 kHz. The evaluation board is designed to

operate at ambient temperatures up to 65°C, and at steady

state operating conditions.

DS(ON)

of the integrated N-channel MOSFET and maxi-

300832

FIGURE 1. Evaluation Board Schematic

Figure 1

National Semiconductor

Application Note 1911

Ricardo Capetillo

July 6, 2010

The performance of the evaluation board is as follows:

Input Range: 4.5V to 42V

Output Voltage: 3.3V

Output Current Range: 0A to 2A

Frequency of Operation: 500 kHz

Board Size: 1.5 X 1.5 inches

Package: PSOP-8

At low input voltages between 4.5V and 6V, a minimum load

of approximately 5 mA may be required to reach a regulated

3.3V output voltage. See the LM22680 datasheet for more

details.

To aid in the design and evaluation of DC/DC buck converter

solutions based on the LM22680 switching regulator, the

evaluation board can be re-configured for different output

voltages.

The evaluation board is designed to highlight applications

with a small solution size. This implies that there will be a

tradeoff with the area of heat dissipation available. If this eval-

uation board is operated continuously at a full 2A load, it will

get hot. For higher output voltages than the pre-adjusted

3.3V, the total output power as well as the total power con-

version losses will increase. It is recommended to use a fan

or other source of air flow when evaluating the board at full

2A load or at output voltages greater than 3.3V. Typical eval-

uation board performance and characteristics curves are

shown in

layout.

Test points are provided to enable easy connection and mon-

itoring of critical signals. When performing over load or short

circuit tests, refer to the current limit section of the LM22680

datasheet to determine if the circuit is in safe operating mode.

For more information about device function and electrical

characteristics, refer to the LM22680 datasheet.

Figure 2

through

Figure

30083201

Figure 6

shows the PCB

www.national.com

Related parts for LM22680EVAL/NOPB

LM22680EVAL/NOPB Summary of contents

Page 1

... For load currents higher than 500 mA, an input volt- age of 5.5V or higher is required. The typical operating fre- quency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 65°C, and at steady state operating conditions. © 2010 National Semiconductor Corporation National Semiconductor Application Note 1911 Ricardo Capetillo July 6, 2010 The performance of the evaluation board is as follows: Input Range: 4 ...

Page 2

... Output capacitor C5 is not populated but space is provided to add a second output capacitor. This second output capacitor may be used to further reduce output voltage ripple. Supplier TDK C4532X7R1H685K Panasonic TDK C1608X7R1H103K Nippon Chemi-Con APXE6R3ARA121ME61G - - Central Semiconductor Wurth Coilcraft MSS1260-123ML - CRCW0603976RFKEA - CRCW06031K54FKEA - National Semiconductor LM22680MR-ADJ 2 Part Number EEEFK1J220XP CMSH5-60 744771112 ...

Page 3

Performance Characteristics Unless otherwise specified 12V FIGURE 2. Start-Up Waveforms (Load Resistor = 1.1Ω) FIGURE 3. Operation 25°C. A 30083205 30083202 FIGURE 5. Overall Loop Gain and Phase (f 3 30083203 FIGURE 4. ...

Page 4

PCB Layout Diagram www.national.com FIGURE 6. Top Layer 4 30083206 ...

Page 5

5 www.national.com ...

Page 6

... 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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