Texas Instruments LMR10530 Manual de usuario

Rinc

Rfbt

VIN U1 SW

LMR10530YSD

8VOUT

Rfbb

Cff

Cinc Co2

Ren

Co1

Cin

SW SW

PGND

SGND

DAP

VINC

EN VIND

VIND

GND

User's Guide

SNVU192A–October 2012–Revised April 2013

AN-2280 LMR10530 Evaluation Module

1 Introduction

The LMR10530 evaluation module is designed to provide the power supply design engineer with a fully

functional regulator design using the LMR10530 3MHz switching regulator in an WSON-10 package. The

evaluation module is configured to provide an output of 1.2V at up to 3A from an input voltage range of 3V

to 5.5V.

The printed circuit board consists of 4 layers of copper on FR4 material. The middle layers are solid

ground layers with the first middle layer having a small polygon cut out for the VIN node. The intermediate

ground layer helps in minimizing the AC current loop. The LMR10530 is thermally tied to the other layers

by thermal vias directly underneath the device. This user's guide contains the evaluation module

schematic, a quick setup procedure, and a Bill-of-Materials (BOM). For complete circuit design

information, see LMR10530 SIMPLE SWITCHER 5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10

(SNVS814).

The module has a Cff capacitor footprint reserved for applications requiring higher VOUT. The Cff cap also

helps to minimize the output voltage overshoot during sluggish startup. For suggested cap values, see the

LMR10530 datasheet (SNVS814). The module also has a reserved footprint for an additional output cap,

Co2, for certain applications requiring more capacitance.

The performance of the evaluation board is:

• Input Range: 3 to 5.5V

• Output Voltage: 1.2V

• Output Current: 0 to 3A

• Frequency of Operation: 3000 kHz

• Board Size: 2.016 × 1.08 inches (51.2 × 27.43 mm)

2 Evaluation Board Schematic

Figure 1. LMR10530 Evaluation Module Schematic

All trademarks are the property of their respective owners.

SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module

Powering and Loading Considerations

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3 Powering and Loading Considerations

Read this entire section prior to attempting to power the evaluation board.

3.1 Quick Start Procedure

Step 1: Set the bench power supply current limit to 3A. Set the power supply voltage to 4V. Turn off the

power supply output. Connect the power supply to the LMR10530 demo board. Positive connection to VIN

and negative connection to GND.

Step 2: Connect a load, as high as 3A, to the VOUT terminal. Positive connection to VOUT and negative

connection to GND.

Step 3: The EN pin should be left open for normal operation.

Step 4: Turn on the bench power supply with no load applied to the LMR10530. The VOUT would be in

regulation at a nominal 1.2V output.

Step 5: Slowly increase the load while monitoring the output voltage, VOUT should remain in regulation as

the load is increased up to 3 Amps. The LMR10530 is designed to skip some pulses at very light loads to

maintain output voltage regulation. Depending on load levels, the circuit may operate in either

discontinuous or continuous conduction mode.

Step 6: Slowly sweep the input voltage from 3 to 5.5V, VOUT should remain in regulation with a nominal

1.2V output.

3.2 Starting Up

By default, VINC is connected to VIN through a low pass filter to remove any high frequency noise present

at the input. EN is connected to VINC through a 100kΩresistor. A separate logic signal at the EN terminal

can be used, if startup and shutdown need to be controlled. The EN pin is tied to VIN to simplify start-up.

The pull-up resistor allows the power supply design engineer to toggle EN independently, if desired, and

observe the start-up behavior of the LMR10530.

3.3 Adjusting the Output Voltage

The output voltage is set using the following equation where Rfbb is connected between the FB pin and

GND, and Rfbt is connected between VOUT and FB.

VOUT = VFB(1 + (Rfbt/Rfbb)) (1)

The feedback voltage VFB is regulated at 0.60V typically.

Adjusting the output voltage will affect the performance of the LMR10530. In addition, output capacitors

might not be rated for the new output voltage. For more information, see LMR10530 SIMPLE SWITCHER

5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10 (SNVS814).

2AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013

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VOUT GND

Oscilloscope

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Powering and Loading Considerations

3.4 Typical Test Setup

Figure 2. Efficiency Measurements

Figure 3. Voltage Ripple Measurements

SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module

GND

VIN SENSE+

SPARE

VOUT SENSE -

VOUT SENSE+

I I I I I I

1 2 3 4 5 6

A B C D E F

VIN VOUT

GND

Powering and Loading Considerations

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Figure 4. Edge Connector Schematic

4AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013

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Board Images

4 Board Images

Figure 5. Top Side

SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module

Board Images

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Figure 6. Bottom Side

6AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013

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VOUT = 1.2V

100 mV/Div

100 Ps/DIV

500 mA/Div

IOUT

VOUT = 1.2V

20 mV/Div

2V/Div

200 ns/DIV

VSW

VOUT = 1.2V

20 mV/Div

2V/Div

200 ns/DIV

VSW

0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0

EFFICIENCY (%)

IOUT(A)

Vin = 3.0V

Vin = 3.5V

Vin = 4.0V

Vin = 4.2V

Vin = 4.6V

Vin = 4.8V

Vin = 5.2V

Vin = 5.5V

VOUT = 1.2V

500 mV/Div

1V/Div

100 Ps/DIV

VIN = 5.5V

2A/Div

IOUT = 3A

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Typical Performance Characteristics

5 Typical Performance Characteristics

Efficiency vs Load Current

VOUT = 1.2V Startup

Steady-state (CCM Mode) Steady-state (DCM Mode)

VIN = 3V, IOUT = 3A VIN = 5.5V, IOUT = 0.025A

Load Transient

VIN = 5.5V, IOUT = 0.3A to 3A

SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module

Bill of Materials

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6 Bill of Materials

Part ID Part Value Part Number Manufacturer

U1 3MHz 3.0A buck regulator, WSON-10 LMR10530 Texas Instruments

L1 1.2µH, 4.6A 7447745012 Wurth Elektronik eiSos

Cin 47µF, 10V, X5R, 1206 C3216X5R0J226M TDK

Cinc 0.22µF, 25V, X7R, 0603 06033D224KAT2A AVX

Co1 47µF, 10V, X5R, 1210 GRM32ER61A476KE20L Murata

D1 Schottky, 30V, 3A, 3-4E1A CMS01 Toshiba

Rfbt 2.00kΩ, 1%, 1/8W, 0603 CRCW06032K00FKEA Vishay

Rfbb 2.00kΩ, 1%, 1/8W, 0603 CRCW06032K00FKEA Vishay

Rinc 10.0Ω, 1%, 1/8W, 0603 CRCW060310R0FKEA Vishay

Ren 100kΩ, 1%, 1/8W, 0603 CRCW0603100KFKEA Vishay

VIN Test Point Loop 5010 Keystone

SW Test Point Loop 5012 Keystone

GND Test Point Loop 5011 Keystone

VOUT Test Point Loop 5013 Keystone

EN Test Point Loop 5014 Keystone

8AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013

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Layout

7 Layout

Figure 7. Top Copper

Figure 8. Top Overlay

SNVU192A–October 2012–Revised April 2013 AN-2280 LMR10530 Evaluation Module

Layout

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Figure 9. Internal Plane 1

Figure 10. Internal Plane 2

10 AN-2280 LMR10530 Evaluation Module SNVU192A–October 2012–Revised April 2013

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