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User's Guide

SLVU441A–May 2011– Revised September 2011

TPS54622EVM-012, 6-A, SWIFT™ Regulator

Evaluation Module

This user’s guide contains background information for the TPS54622 as well as support documentation for

the TPS54622EVM-012 evaluation module (PWR012). Also included are the performance specifications,

the schematic, and the bill of materials for the TPS54622EVM-012.

Contents

1 Introduction .................................................................................................................. 2

2 Test Setup and Results .................................................................................................... 4

3 Board Layout ............................................................................................................... 12

4 Schematic and Bill of Materials .......................................................................................... 15

List of Figures

1 TPS54622EVM-012 Efficiency ............................................................................................ 5

2 TPS54622EVM-012 Low Current Efficiency............................................................................. 5

3 TPS54622EVM-012 Load Regulation.................................................................................... 6

4 TPS54622EVM-012 Line Regulation..................................................................................... 7

5 TPS54622EVM-012 Transient Response ............................................................................... 7

6 TPS54622EVM-012 Loop Response..................................................................................... 8

7 TPS54622EVM-012 Output Ripple ....................................................................................... 8

8 TPS54622EVM-012 Input Ripple ......................................................................................... 9

9 TPS54622EVM-012 Start-Up Relative to V

.......................................................................... 10

10 TPS54622EVM-012 Start-Up Relative to Enable ..................................................................... 10

11 TPS54622EVM-012 Start Up Into Pre-Bias............................................................................ 11

12 TPS54622EVM-012 Hiccup Mode Current Limit ...................................................................... 11

13 TPS54622EVM-012 Top-Side Layout .................................................................................. 12

14 TPS54622EVM-012 Layout 2............................................................................................ 13

15 TPS54622EVM-012 Layout 3............................................................................................ 13

16 TPS54622EVM-012 Bottom-Side Layout .............................................................................. 14

17 TPS54622EVM-012 Top-Side Assembly............................................................................... 14

18 TPS54622EVM-012 Schematic.......................................................................................... 15

List of Tables

1 Input Voltage and Output Current Summary ............................................................................ 2

2 TPS54622EVM-012 Performance Specification Summary............................................................ 2

3 Output Voltages Available ................................................................................................. 3

4 EVM Connectors and Test Points ........................................................................................ 4

5 TPS54622EVM-012 Bill of Materials.................................................................................... 16

SWIFT is a trademark of Texas Instruments.

SLVU441A–May 2011–Revised September 2011 TPS54622EVM-012, 6-A, SWIFT™ Regulator— Evaluation Module

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Summary of content (18 pages)

PAGE 1
User's Guide SLVU441A – May 2011 – Revised September 2011 TPS54622EVM-012, 6-A, SWIFT™ Regulator Evaluation Module This user’s guide contains background information for the TPS54622 as well as support documentation for the TPS54622EVM-012 evaluation module (PWR012). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54622EVM-012. 1 2 3 4 Contents Introduction ...............................................................................................
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Introduction www.ti.com 1 Introduction 1.1 Background The TPS54622 dc/dc converter is designed to provide up to a 6-A output. The TPS54622 implements split-input power rails with separate input voltage inputs for the power stage and control circuitry. The power stage input (PVIN) is rated for 1.6 V to 17 V whereas the control input (VIN) is rated for 4.5 V to 17 V. The TPS54622EVM-012 provides both inputs but is designed and tested using the PVIN connected to VIN.
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Introduction www.ti.com 1.3 Modifications These evaluation modules are designed to provide access to the features of the TPS54622. Some modifications can be made to this module. 1.3.1 Output Voltage Set Point The output voltage is set by the resistor divider network of R6 and R7. R6 is fixed at 10 kΩ. To change the output voltage of the EVM, it is necessary to change the value of resistor R7. Changing the value of R7 can change the output voltage above 0.6 V.
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Test Setup and Results 1.3.5 www.ti.com Input Voltage Rails The EVM is designed to accommodate different input voltage levels for the power stage and control logic. During normal operation, the PVIN and VIN inputs are connected using a jumper across J5. The single input voltage is supplied at J1. If desired, these two input voltage rails may be separated by removing the jumper across J5. Two input voltages must then be provided at both J1 and J4.
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Test Setup and Results www.ti.com 100 95 90 Efficiency - % 85 VIN = 8 V VIN = 12 V 80 VIN = 17 V 75 70 65 60 55 50 0 1 2 3 Output Current - A 4 5 6 Figure 1. TPS54622EVM-012 Efficiency Figure 2 shows the efficiency for the TPS54622EVM-012 using a semi-log scale to more easily show efficiency at lower output currents. The ambient temperature is 25°C. 100 VIN = 17 V VIN = 12 V 90 80 VIN = 8 V Efficiency - % 70 60 50 40 30 20 10 0 0.01 0.1 1.0 10.0 Output Current - A Figure 2.
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Test Setup and Results www.ti.com The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the internal MOSFET. 2.3 Output Voltage Load Regulation Figure 3 shows the load regulation for the TPS54622EVM-012. 0.4 Output Voltage Deviation - % 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 0 1 2 3 Output Current - A 4 5 6 Figure 3. TPS54622EVM-012 Load Regulation Measurements are given for an ambient temperature of 25°C.
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Test Setup and Results www.ti.com 2.4 Output Voltage Line Regulation Figure 4 shows the line regulation for the TPS54622EVM-012. 0.4 Output Voltage Deviation - % 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 8 9 10 11 13 12 Input Voltage - V 14 15 16 17 Figure 4. TPS54622EVM-012 Line Regulation 2.5 Load Transients Figure 5 shows the TPS54622EVM-012 response to load transients. The current step is from 25% to 75% of maximum rated load at 12-V input. The current step slew rate is 100 mA / µsec.
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Test Setup and Results 2.6 www.ti.com Loop Characteristics Figure 6 shows the TPS54622EVM-012 loop-response characteristics. Gain and phase plots are shown for VIN voltage of 12 V. Load current for the measurement is 1.9 A. 60 180 50 150 Phase 120 30 90 20 60 10 30 0 0 Gain -10 -30 -20 -60 -30 -90 -40 -120 -50 -150 -60 100 1000 10000 100000 Phase - Degrees Gain - dB 40 -180 1000000 Frequency - Hz Figure 6. TPS54622EVM-012 Loop Response 2.
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Test Setup and Results www.ti.com 2.8 Input Voltage Ripple Figure 8 shows the TPS54622EVM-012 input voltage. The output current is the rated full load of 6 A and VIN = 12 V. The ripple voltage is measured directly across the input capacitors. VIN = 500 mV / div PH = 5 V / div Time = 1 µsec / div Figure 8.
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Test Setup and Results 2.9 www.ti.com Powering Up Figure 9 and Figure 10 show the start-up waveforms for the TPS54622EVM-012. In Figure 9, the output voltage ramps up as soon as the input voltage reaches the UVLO threshold as set by the R1 and R2 resistor divider network. In Figure 10, the input voltage is initially applied and the output is inhibited by using a jumper at J3 to tie EN to GND. When the jumper is removed, EN is released.
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Test Setup and Results www.ti.com 2.10 Pre-Bias Start-Up The TPS54622 is designed to start up into a pre-biased output. The output voltage is not discharged to ground at the beginning of the slow-start sequence. Figure 11 shows the start-up waveform with the output voltage pre-biased to 1 V. VIN = 10 V / div VOUT = 2 V / div PH = 10 V / div Time = 2 msec / div Figure 11. TPS54622EVM-012 Start Up Into Pre-Bias 2.11 Hiccup Mode Current Limit The TPS54622 features hiccup mode current limit.
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Board Layout 3 www.ti.com Board Layout This section provides a description of the TPS54622EVM-012 board layout and layer illustrations. 3.1 Layout The board layout for the TPS54622EVM-012 is shown in Figure 13 through Figure 17. The top-side layer of the EVM is laid out in a manner typical of a user application. The top, bottom, and internal layers are 2-oz. copper. The top layer contains the main power traces for PVIN, VIN, VOUT, and VPHASE.
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Board Layout www.ti.com Figure 14. TPS54622EVM-012 Layout 2 Figure 15.
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Board Layout www.ti.com Figure 16. TPS54622EVM-012 Bottom-Side Layout Figure 17.
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Schematic and Bill of Materials www.ti.com 4 Schematic and Bill of Materials This section presents the TPS54622EVM-012 schematic and bill of materials. 4.1 Schematic TRACK OUT 2 1 TRACK IN 1 2 1 2 EN GND R7 2.21k J6 V_SNS C10 Open R6 10.0k TP6 SS/TR R2 8.06k C8 4.7uF R1 35.7k C11 open C2 10uF J3 TP9 1 VIN GND PVIN GND J4 2 2 VIN TP8 1 J5 PVIN 1 J1 2 TP2 EN C1 Open VIN = 8 - 17 V TP1 Open R9 Open 15 COMP VIN V_SNS V_SNS 7 PVIN 5 4 6 PVIN GND 3 GND C4 0.
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Schematic and Bill of Materials 4.2 www.ti.com Bill of Materials Table 5 presents the bill of materials for the TPS54622EVM-012. Table 5. TPS54622EVM-012 Bill of Materials Count RefDes Value Description Size Part Number MFR 0 C1 Open Capacitor, Ceramic 1210 Std Std 1 C2 10µF Capacitor, Ceramic, 25V, X5R, 20% 1210 Std Std 1 C3 0.1µF Capacitor, Ceramic, 25V, X7R, 10% 0603 Std Std 1 C4 0.
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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.
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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.