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1 Introduction

User's Guide

SLVU234 – February 2008

TPS6227xEVM-306

The TPS6227xEVM-306 user’s guide describes the characteristics, operation, and use of the

TPS6227xEVM-306 evaluation module (EVM). This EVM demonstrates the Texas Instruments TPS62270,

a 2.25 MHz, synchronous step-down converter that provides up to 400 mA of output current. See the

TPS62270 data sheet (SLVS799 ), 2.25 MHz 400-mA Step Down Converter With Selectable VOUT for

device specifications and recommended operating conditions. This user’s guide includes setup

instructions, a schematic diagram, a bill of materials (BOM), and PCB layout drawings for the evaluation

module.

Contents

1 Introduction ................................................................................................................... 1

2 Setup .......................................................................................................................... 2

3 Operation ..................................................................................................................... 2

4 Test Results .................................................................................................................. 3

5 Board Layout ................................................................................................................. 6

6 Schematic and Bill of Materials ............................................................................................ 8

6.1 Schematic ............................................................................................................ 8

6.2 Bill of Materials ...................................................................................................... 9

List of Figures

1 Start up from Enable, V

= 3.6 V, VOUT = 1.15 V, R

Load

= 2.5 Ω ...................................................... 3

2 Load Transient, 115 mA to 300 mA step, V

= 3.6 V, VOUT = 1.15 V ................................................ 3

3 Load Transient, 300 mA to 115 mA step, V

= 3.6 V, VOUT = 1.15 V ................................................ 4

4 Start up from Enable, V

= 3.6 V, VOUT = 0.9 V, R

Load

= 2.5 Ω ....................................................... 4

5 Load Transient, 90 mA to 272 mA step, V

= 3.6 V, VOUT = 0.9 V ................................................... 5

6 Load Transient, 272 mA to 90 mA step, V

= 3.6 V, VOUT = 0.9 V ................................................... 5

7 VSEL Output Voltage Response, V

= 3.6 V, R

Load

= 3.3 Ω ............................................................ 6

8 Assembly Layer .............................................................................................................. 7

9 Top Layer Routing ........................................................................................................... 7

10 Bottom Layer Routing ....................................................................................................... 8

11 TPS6227XEVM-306 Schematic ............................................................................................ 8

List of Tables

1 TPS6227xEVM-306 Jumpers and Connections ......................................................................... 2

2 TPS6227XEVM-306 Bill of Materials ...................................................................................... 9

The TPS6227xEVM-306 EVM helps designers evaluate the operation and performance of the TPS62270

DC/DC converter. This converter is a 2.25 MHz, synchronous, step-down converter capable of providing

400 mA of output current.

Related Documentation From Texas Instruments

TPS62270 data sheet (SLVS799 ), 2.25 MHz 400-mA Step Down Converter With Selectable VOUT.

SLVU234 – February 2008 TPS6227xEVM-306 1

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Summary of content (11 pages)

PAGE 1
User's Guide SLVU234 – February 2008 TPS6227xEVM-306 The TPS6227xEVM-306 user’s guide describes the characteristics, operation, and use of the TPS6227xEVM-306 evaluation module (EVM). This EVM demonstrates the Texas Instruments TPS62270, a 2.25 MHz, synchronous step-down converter that provides up to 400 mA of output current. See the TPS62270 data sheet (SLVS799), 2.25 MHz 400-mA Step Down Converter With Selectable VOUT for device specifications and recommended operating conditions.
PAGE 2
www.ti.com Setup 2 Setup Table 1 describes the jumpers and connectors on the EVM, as well as how to properly connect, setup, and use the TPS6227xEVM-306. Table 1. TPS6227xEVM-306 Jumpers and Connections Jumper Connection Description Connection Instructions J1 – VIN Positive input supply voltage Leads to the input supply should be twisted and kept as short as possible to minimize EMI transmission.
PAGE 3
www.ti.com Test Results 4 Test Results This section provides typical performance waveforms (Figure 1 through Figure 7) using the TPS6227XEVM-306 printed circuit board. 2 V/div ENABLE 1.15 V 500 mV/div VOUT 0V VI = 3.6 V, RLoad = 2.5 W 100 ms/div Figure 1. Start up from Enable, VI = 3.6 V, VOUT = 1.15 V, RLoad= 2.5 Ω VOUT = 1.15 V 20 mV/div 300 mA 100 mA/div 115 mA VI = 3.6 V, VSEL = H Load Current 5 ms/div Figure 2. Load Transient, 115 mA to 300 mA step, VI = 3.6 V, VOUT = 1.
PAGE 4
www.ti.com Test Results Vl = 3.6 V, VSEL = H VOUT = 1.15 V 20 mV/div Load Current 300 mA 115 mA 100 mA/div 5 ms/div Figure 3. Load Transient, 300 mA to 115 mA step, VI = 3.6 V, VOUT = 1.15 V 2 V/div ENABLE 0.9 V 500 mV/div VOUT 0V VI = 3.6 V, RLoad = 2.5 W 100 ms/div Figure 4. Start up from Enable, VI = 3.6 V, VOUT = 0.9 V, RLoad = 2.
PAGE 5
www.ti.com Test Results VOUT = 0.9 V 20 mV/div 272 mA 100 mA/div 90 mA Load Current VI = 3.6 V, VSEL = L 5 ms/div Figure 5. Load Transient, 90 mA to 272 mA step, VI = 3.6 V, VOUT = 0.9 V VI = 3.6 V, VSEL = L VOUT = 0.9 V 20 mV/div 272 mA Load Current 90 mA 100 mA/div 5 ms/div Figure 6. Load Transient, 272 mA to 90 mA step, VI = 3.6 V, VOUT = 0.
PAGE 6
www.ti.com Board Layout VI = 3.6 V, RLoad = 3.3 W VOUT 1.15 V 0.9 V 0.9 V 200 mV/div VSEL 2 V/div 20 ms/div Figure 7. VSEL Output Voltage Response, VI = 3.6 V, RLoad = 3.3 Ω 5 Board Layout This section provides the TPS6227XEVM-306 board layout and illustrations. Board layout is critical for all high frequency switch mode power supplies. Figure 8 through Figure 10 show the board layout for the TPS6227XEVM-306 printed wire board (PWB).
PAGE 7
www.ti.com Board Layout Figure 8. Assembly Layer Figure 9.
PAGE 8
www.ti.com Schematic and Bill of Materials Figure 10. Bottom Layer Routing 6 Schematic and Bill of Materials This section provides the TPS6227XEVM-306 schematic and bill of materials. 6.1 Schematic Figure 11.
PAGE 9
www.ti.com Schematic and Bill of Materials 6.2 Bill of Materials Table 2. TPS6227XEVM-306 Bill of Materials (1) (2) (3) (4) Count (1) (2) (3) (4) Referen ce Value Descrip tion Description Size Part Number MFR 2 C1, C2 10 µF Capacitor, Ceramic, 6.3 V, X5R, 20% 0603 GRM188R60J106ME47D muRata 4 J1, J2, J3, J4 PTC36SAAN Header, 2 pin, 100 mil spacing, (36-pin strip) 0.100 x 2 PTC36SAAN Sullins 2 JP1, JP2 PTC36SAAN Header, 3 pin, 100mil spacing, (36-pin strip) 0.
PAGE 10
EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
PAGE 11
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.