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User's Guide

SLVU481–July 2011

TPS54527EVM-052, 5-A, SWIFT™ Regulator

Evaluation Module

This user's guide contains information for the TPS54527 as well as support documentation for the

TPS54527EVM-052 evaluation module. Included are the performance specifications, schematic, and the

bill of materials of the TPS54527EVM-052.

Contents

1 Introduction .................................................................................................................. 3

2 Performance Specification Summary ..................................................................................... 3

3 Modifications ................................................................................................................. 3

3.1 Output Voltage Setpoint ........................................................................................... 3

3.2 Output Filter and Closed-Loop Response ...................................................................... 4

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

4.1 Input/Output Connections ......................................................................................... 4

4.2 Start-Up Procedure ................................................................................................ 5

4.3 Efficiency ............................................................................................................ 5

4.4 Load Regulation .................................................................................................... 6

4.5 Line Regulation ..................................................................................................... 6

4.6 Load Transient Response ........................................................................................ 7

4.7 Output Voltage Ripple ............................................................................................. 7

4.8 Input Voltage Ripple ............................................................................................... 8

4.9 Start-Up ............................................................................................................. 8

5 Board Layout ............................................................................................................... 10

5.1 Layout .............................................................................................................. 10

6 Schematic, Bill of Materials, and Reference ........................................................................... 13

6.1 Schematic ......................................................................................................... 13

6.2 Bill of Materials .................................................................................................... 14

6.3 Reference .......................................................................................................... 14

List of Figures

1 TPS54527EVM-052 Efficiency ............................................................................................ 5

2 TPS54527EVM-052 Light-Load Efficiency............................................................................... 5

3 TPS54527EVM-052 Load Regulation, V

= 5 V and V

= 12 V...................................................... 6

4 TPS54527EVM-052 Line Regulation..................................................................................... 6

5 TPS54527EVM-052 Load Transient Response......................................................................... 7

6 TPS54527EVM-052 Output Voltage Ripple ............................................................................. 7

7 TPS54527EVM-052 Input Voltage Ripple ............................................................................... 8

8 TPS54527EVM-052 Start-Up Relative to V

With SS ................................................................. 8

9 TPS54527EVM-052 Start-Up Relative to V

With VREG5............................................................ 9

10 TPS54527EVM-052 Start-Up Relative to EN With SS................................................................. 9

11 TPS54527EVM-052 Start-Up Relative to EN With VREG5.......................................................... 10

12 Top Assembly.............................................................................................................. 11

13 Top Layer................................................................................................................... 11

14 Internal Layer 1 ............................................................................................................ 12

SWIFT, D-CAP2 are trademarks of Texas Instruments.

SLVU481–July 2011 TPS54527EVM-052, 5-A, SWIFT™ Regulator— Evaluation Module

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Summary of content (16 pages)

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User's Guide SLVU481 – July 2011 TPS54527EVM-052, 5-A, SWIFT™ Regulator Evaluation Module This user's guide contains information for the TPS54527 as well as support documentation for the TPS54527EVM-052 evaluation module. Included are the performance specifications, schematic, and the bill of materials of the TPS54527EVM-052. 1 2 3 4 5 6 Contents Introduction ..................................................................................................................
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www.ti.com 15 Internal Layer 2 ............................................................................................................ 12 16 Bottom Layer ............................................................................................................... 13 17 TPS54527EVM-052 Schematic Diagram............................................................................... 13 1 Input Voltage and Output Current Summary ....................................................................
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Introduction www.ti.com 1 Introduction The TPS54527 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a low external component count. The D-CAP2™ control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 650 kHz.
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Test Setup and Results www.ti.com Table 3 lists the R1 values for some common output voltages. For higher output voltages of 1.8 V or above, a feedforward capacitor (C4) may be required to improve phase margin. Pads for this component (C4) are provided on the printed-circuit board. Note that the resistor values given in Table 3 are standard values and not the exact value calculated using Equation 1. Table 3. Output Voltages 3.
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Test Setup and Results www.ti.com 4.2 Start-Up Procedure 1. Ensure that the jumper at JP1 (Enable control) is set from EN to OFF. 2. Apply appropriate VIN voltage to VIN and PGND terminals at J1. 3. Move the jumper at JP1 (Enable control) to cover EN and ON. The EVM enables the output voltage. 4.3 Efficiency Figure 1 shows the efficiency for the TPS54527EVM-052 at an ambient temperature of 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 5 V VIN = 12 V 10 0 0 0.5 1 1.5 2 2.
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Test Setup and Results 4.4 www.ti.com Load Regulation The load regulation for the TPS54527EVM-052 is shown in Figure 3. 0.2 VIN = 5 V VIN = 12 V Output Voltage Deviation (%) 0.15 0.1 0.05 0 −0.05 −0.1 −0.15 −0.2 0 0.5 1 1.5 2 2.5 3 Output Current (A) 3.5 4 4.5 5 G003 Figure 3. TPS54527EVM-052 Load Regulation, VIN = 5 V and VIN = 12 V. 4.5 Line Regulation The line regulation for the TPS54527EVM-052 is shown in Figure 4. 0.4 Output Voltage Deviation (%) 0.3 0.2 0.1 0 −0.1 −0.2 −0.
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Test Setup and Results www.ti.com 4.6 Load Transient Response The TPS54527EVM-052 response to load transient is shown in Figure 5. The current step is from 1.25 A to 3.75 A. Total peak-to-peak voltage variation is as shown. VOUT = 100 mV / div (ac coupled) IOUT = 1 A / DIV Load step = 1.25 A to 3.75 A Slew rate = 1 A / µsec Time = 100 µsec / div Figure 5. TPS54527EVM-052 Load Transient Response 4.7 Output Voltage Ripple The TPS54527EVM-052 output voltage ripple is shown in Figure 6.
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Test Setup and Results 4.8 www.ti.com Input Voltage Ripple The TPS54527EVM-052 input voltage ripple is shown in Figure 7. The output current is the rated full load of 5 A. VIN = 100 mV / div (ac coupled) PH = 5 V / DIV Time = 1 µsec / div Figure 7. TPS54527EVM-052 Input Voltage Ripple 4.9 Start-Up The TPS54527EVM-052 start-up waveforms relative to VIN are shown in Figure 8 and Figure 9. VIN = 10 V / div SS = 5 V / div VOUT = 500 mV / div Time = 1 msec / div Figure 8.
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Test Setup and Results www.ti.com VIN = 10 V / div VREG5 = 5 V / div VOUT = 500 mV / div Time = 1 msec / div Figure 9. TPS54527EVM-052 Start-Up Relative to VIN With VREG5 The TPS54527EVM-052 start-up waveforms relative to enable (EN) are shown in Figure 10 and Figure 11. EN = 10 V / div SS = 5 V / div VOUT = 500 mV / div Time = 1 msec / div Figure 10.
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Board Layout www.ti.com EN = 10 V / div VREG5 = 5 V / div VOUT = 500 mV / div Time = 1 msec / div Figure 11. TPS54527EVM-052 Start-Up Relative to EN With VREG5 5 Board Layout This section provides description of the TPS54527EVM-052, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS54527EVM-052 is shown in Figure 12 through Figure 16. The top layer contains the main power traces for VIN, VO, and ground.
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Board Layout www.ti.com Figure 12. Top Assembly Figure 13.
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Board Layout www.ti.com Figure 14. Internal Layer 1 Figure 15.
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Schematic, Bill of Materials, and Reference www.ti.com Figure 16. Bottom Layer 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 17 is the schematic for the TPS54527EVM-052. TP1 J1 VIN = 4.5 V - 18 V 1 VIN 2 GND TP2 C1 C2 C3 10uF 10uF 0.1uF 3 JP1 ON EN OFF R3 0 TP4 1 2 TP3 R4 10.0k 3 U1 2 TPS54x2xDDA 1 R1 8.25k 2 VOUT C4 3 TP5 1 4 R2 TP7 22.1k EN VIN VFB VBST VREG5 SS SW PWPD GND 8 7 C7 0.1uF TP6 1uF C6 VOUT = 1.
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Schematic, Bill of Materials, and Reference 6.2 www.ti.com Bill of Materials Table 5. Bill of Materials RefDes QTY Value Description Size Part Number MFR C1, C2 2 10uF Capacitor, Ceramic, 25V, X5R, 20% 1210 Std Std C11 0 Open Capacitor, Ceramic 1206 Std Std C3, C7 2 0.1uF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std C4, C8 1 Open Capacitor, Ceramic 0603 Std Std C5 1 1.
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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.