Texas Instruments TPS54980EVM-022 User Manual Download Page 5

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Contents

Introduction

1-1

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1.1

Background

1-2

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1.2

Performance Specification Summary

1-3

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1.3

Modifications

1-4

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1.3.1

Changing Output Voltage

1-4

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1.3.2

Switching Frequency

1-4

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1.3.3

Power Sequencing

1-5

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Test Setup and Results

2-1

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2.1

Input/Output Connections

2-2

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2.2

Efficiency

2-3

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2.3

Power Dissipation

2-4

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2.4

Output Voltage Regulation

2-5

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2.5

Load Transients

2-6

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2.6

Loop Characteristics

2-6

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2.7

Output Voltage Ripple

2-7

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2.8

Input Voltage Ripple

2-8

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2.9

Power Up and Down

2-9

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Board Layout

3-1

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3.1

Layout

3-2

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Schematic and Bill of Materials

4-1

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4.1

Schematic

4-2

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4.2

Bill of Materials

4-3

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Summary of Contents for TPS54980EVM-022

Page 1: ...E September 2003 PMP Systems Power User s Guide SLVU090...

Page 2: ...itute a license from TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual p...

Page 3: ...handling or use of the goods Please be aware that the products received may not be regulatory compliant or agency certified FCC UL CE etc Due to the open construction of the product it is the user s r...

Page 4: ...ere is uncertainty as to the load specification please contact a TI field representative During normal operation some circuit components may have case temperatures greater than 55 C The EVM is designe...

Page 5: ...1 5 2 Test Setup and Results 2 1 2 1 Input Output Connections 2 2 2 2 Efficiency 2 3 2 3 Power Dissipation 2 4 2 4 Output Voltage Regulation 2 5 2 5 Load Transients 2 6 2 6 Loop Characteristics 2 6 2...

Page 6: ...Power Up with Tracking 2 9 2 12 Power Down With Tracking 2 10 2 13 Power Up With Ratiometric Sequencing 2 10 2 14 Power Down With Ratiometric Sequencing 2 11 2 15 Power Up With Core Voltage Rising Fir...

Page 7: ...Chapter 4 Schematic and Bill of Materials FCC Warning This equipment is intended for use in a laboratory test environment only It gen erates uses and can radiate radio frequency energy and has not be...

Page 8: ...4...

Page 9: ...54980 as well as support documentation for the TPS54980EVM 022 evaluation module HPA022 The TPS54980EVM 022 performance specifications are given as well as modifications Topic Page 1 1 Background 1 2...

Page 10: ...igning with the TPS54980 regulator The switching frequency is set at a nominal 700 kHz allowing the use of a small footprint 0 65 H output inductor The MOSFETs of the TPS54980 are incorporated inside...

Page 11: ...Summary Parameters Test Conditions Min Typ Max Units Input voltage range 3 0 3 3 4 0 V Output voltage set point 1 8 V Output current range VI 3 to 5 5 V 9 9 A Line regulation IO 0 A to 3 A VI 3 V to 5...

Page 12: ...ation 1 1 R2 10 kW 0 891 V V O 0 891 V Table 1 3 Output Voltage Programming Output Voltage V R2 Value kW 0 9 1000 1 2 28 7 1 5 14 7 1 8 9 76 2 5 5 49 The minimum output voltage is limited by the minim...

Page 13: ...1 1 3 3 Power Sequencing By selecting different R6 R7 resistor divider ratios different power sequencing scenarios can be set The Equations 1 3 1 4 and 1 5 show how to select the different ways of pow...

Page 14: ...1 6...

Page 15: ...022 and covers efficiency output voltage regulation load transients loop response output ripple input ripple and startup Topic Page 2 1 Input Output Connections 2 2 2 2 Efficiency 2 3 2 3 Power Dissi...

Page 16: ...to easily connect an oscilloscope voltage probe to monitor the output voltage The TPS54980 is intended to be used as a point of load regulator In typical applications it is usually located close to th...

Page 17: ...ient temperature of 25 C The efficiency is lower at higher ambient temperatures due to temperature variation in the drain to source resistance of the MOSFETs Efficiency is slightly lower at 700 kHz th...

Page 18: ...ad the junction temperature is approximately 60 C while the case temperature is approximately 55 C The total circuit losses at 25 C are shown in Figure 2 3 Power dissipaton is shown for an input volta...

Page 19: ...asurements are shown for an ambient temperature of 25 C Figure 2 4 Load Regulation 1 0 8 0 6 0 4 0 2 0 0 2 0 4 0 6 0 8 1 0 1 2 3 4 5 6 7 8 9 10 OUTPUT VOLTAGE vs OUTPUT CURRENT IO Output Current A Out...

Page 20: ...nt Response TPS54980 IO 2 A div t Time 200 s div VO ac 50 mV div 2 6 Loop Characteristics The TPS54980EVM 022 loop response characteristics are shown in Figure 2 7 and Figure 2 8 Gain and phase plots...

Page 21: ...0 Phase Gain Gain dB f Frequency Hz MEASURED LOOP RESPONSE Phase deg 2 7 Output Voltage Ripple The TPS54980EVM 022 output voltage ripple is shown in Figure 2 9 The input voltage is 3 3 V for the TPS54...

Page 22: ...TPS54980EVM 022 output voltage ripple is shown in Figure 2 10 The input voltage is 3 3 V for the TPS54980 Output current for each device is the rated full load of 9 A Figure 2 10 Input Voltage Ripple...

Page 23: ...s nominal 1 8 V level After that the core regulator starts to regulate its output at the preset 1 8 V level The I O regulator continues its ramp up until the voltage reaches the nominal 3 3 V level Th...

Page 24: ...JP2 is set so that R8 is connected in parallel to R7 ratiometric power sequencing is implemented For ratiometric sequencing the following condition must to be met if R6 10 k then R8 II R7 R7 0 891 VI...

Page 25: ...0 mV div If jumper JP2 is set so that R8 is connected in parallel to R6 the core voltage rises first during power up and falls second during power down The waveforms with this type of sequencing are s...

Page 26: ...Power Up and Down 2 12 Figure 2 16 Power Up With Core Voltage Falling Second VO I O 500 mV div t Time 1 ms div VO Core 500 mV div...

Page 27: ...3 1 Board Layout This chapter provides a description of the TPS54980EVM 022 board layout and layer illustrations Topic Page 3 1 Layout 3 2 Chapter 3...

Page 28: ...area filled with ground The bottom layer contains ground and some signal routing The top and bottom ground traces are connected with multiple vias placed around the board including 12 directly under t...

Page 29: ...Layout 3 3 Board Layout Figure 3 2 Internal Layer 2 Figure 3 3 Internal Layer 3...

Page 30: ...Layout 3 4 Figure 3 4 Bottom Side Layout looking from top side Figure 3 5 Top Side Assembly...

Page 31: ...4 1 Schematic and Bill of Materials The TPS54980EVM 022 schematic and bill of materials are presented in this chapter Topic Page 4 1 Schematic 4 2 4 2 Bill of Materials 4 3 Chapter 4...

Page 32: ...Schematic 4 2 4 1 Schematic The schematic for the TPS54980EVM 022 is shown in Figure 4 1 Figure 4 1 TPS54980EVM 022 Schematic...

Page 33: ...148830 OST ED1609 1 J2 Terminal block 2 pin 6 A 3 5 mm 75525 OST ED1514 1 JP1 Header 2 pin 100 mil spacing 36 pin strip 0 100 2I Sullins PTC36SAAN 1 JP2 Header 3 pin 100 mil spacing 36 pin strip 0 10...

Page 34: ...nous PWM switcher PWP28 TI TPS54980PWP 1 PCB 3 in 3 in 0 062 in Any HPA022 Notes 1 These assemblies are ESD sensitive ESD precautions should be observed 2 These assemblies must be clean and free from...

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