Texas Instruments TPS56121 User Manual Download Page 18 | Manualshive

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Texas Instruments TPS56121 User Manual Download Page 18

9.10 Control Loop Bode Plot

Figure 9-11. Loop Gain (VIN = 12 V, VOUT = 1.0 V, IOUT = 15 A, Bandwidth: 39 kHz, Phase Margin: 46°)

9.11 Thermal Image

Figure 9-12. Thermal Image (VIN = 14 V, VOUT = 1.0 V, IOUT = 15 A, without airflow)

Performance Data and Typical Characteristic Curves

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TPS56121 Step-Down Converter Evaluation Module User's Guide

SLVU445C – MARCH 2011 – REVISED AUGUST 2021

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Copyright © 2021 Texas Instruments Incorporated

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Summary of Contents for TPS56121

Page 1: ...quipment Shutdown 12 9 Performance Data and Typical Characteristic Curves 13 9 1 Efficiency 13 9 2 Load Regulation 13 9 3 Line Regulation 14 9 4 Output Voltage Ripple 14 9 5 Switch Node 15 9 6 Load Transient 15 9 7 Start Up 16 9 8 Power Off 17 9 9 Over Current Protection 17 9 10 Control Loop Bode Plot 18 9 11 Thermal Image 18 10 EVM Assembly Drawings and PCB Layout 19 11 List of Materials 22 12 Re...

Page 2: ...Image VIN 14 V VOUT 1 0 V IOUT 15 A without airflow 18 Figure 10 1 TPS56121EVM 601 Top Assembly Drawing top view 19 Figure 10 2 TPS56121EVM 601 Bottom Assembly Drawing bottom view 19 Figure 10 3 TPS56121EVM 601 Top Copper top view 20 Figure 10 4 TPS56121EVM 601 Internal 1 top view 20 Figure 10 5 TPS56121EVM 601 Internal 2 top view 21 Figure 10 6 TPS56121EVM 601 Bottom Copper top view 21 List of Ta...

Page 3: ...TPS56121 High Current Synchronous Buck Converter with integrated MOSFETs The TPS56121 integrates TI s high performance controller technology with TI s industry leading MOSFET technology in a standard QFN package to meet the demands of modern high current and space constrained applications www ti com Introduction SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback TPS56121 Step Down Co...

Page 4: ...ge FPGA or Micro Controller Core Supplies High Current Point of Load Modules Telecommunications Equipment Computer Peripherals 2 2 Features 8 V to 14 V Input Voltage Rating 1 0 V 2 Output Voltage Rating 15 A Steady State Load Current 500 kHz Switching Frequency Simple Access to Power Good Enable Soft Start and Error Amplifier Convenient Converter Performance Test Points Description www ti com 4 TP...

Page 5: ... 0 1 02 V Line regulation VIN 8 V to 14 V IOUT 15 A 0 1 Load regulation VIN 12 V IOUT 0 A to 15 A 0 5 VRIPPLE Output voltage ripple VIN 12 V IOUT 15 A 20 mVPP IOUT Output current VIN 8 V to 14 V 0 15 A Systems Characteristics fSW Switching frequency 450 500 550 kHz ηpk Peak efficiency VIN 12 V IOUT 13 A 90 5 η Full load efficiency VIN 12 V IOUT 15 A 90 4 Operating temperature 25 C www ti com Elect...

Page 6: ... 1 TPS56121EVM 601 Schematic Schematic www ti com 6 TPS56121 Step Down Converter Evaluation Module User s Guide SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 7: ... 1 0 µs division horizontal resolution 5 1 5 Fan The TPS56121EVM 601 Evaluation Module includes components that can get hot to touch when operating Because this evaluation module is not enclosed to allow probing of circuit nodes a small fan capable of 200 lfm to 400 lfm is recommended to reduce component temperatures when operating 5 2 Recommended Wire Gauge 5 2 1 VIN to J1 The connection between ...

Page 8: ...e VIN it is advisable to limit the source current from VIN to 3 0 A maximum Make sure VIN is initially set to 0 V and connected as shown in Figure 5 1 3 Connect VIN to J1 as shown in Figure 5 1 4 Connect ammeter A1 between VIN and J1 as shown in Figure 5 1 5 Connect voltmeter V1 to TP1 and TP2 as shown in Figure 5 1 6 Connect voltmeter V2 to TP3 and TP4 as shown in Figure 5 1 7 Place the fan as sh...

Page 9: ...pacitor and disables the TPS56121 converter Opening J3 enables the TPS56121 converter Default setting short to disable the converter www ti com Configurations SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback TPS56121 Step Down Converter Evaluation Module User s Guide 9 Copyright 2021 Texas Instruments Incorporated ...

Page 10: ... technique in Section 8 2 7 3 Enable Soft start Monitoring TP5 TPS56121EVM 601 provides a test point for measuring the enable soft start voltage of the TPS56121 converter This test point can be monitored to observe the start up calibration waveform soft start ramp or fault time out timing The enable soft start test point should not be actively driven from an external circuit such as a logic output...

Page 11: ...ecrease LOAD to 0 A 8 2 Output Ripple Voltage Measurement Procedure 1 Follow Section 8 1 to set VIN and LOAD to desired operating condition 2 Set oscilloscope for Output Voltage Ripple Measurement in Section 5 1 4 3 Connect oscilloscope probe with exposed metal barrel to TP3 and TP4 per Figure 8 1 Using a leaded ground connection may induce additional noise due to the large ground loop 4 Follow Se...

Page 12: ...sformer 7 Sweep the frequency from 500 Hz to 500 kHz with 10 Hz or lower post filter 8 Control loop gain can be measured by ChannelB 20 log ChannelA æ ö ç è ø 9 Control loop phase can be measured by the phase difference between Channel A and Channel B 10 Follow Section Section 8 1 to power down T I EXAS NSTRUMENTS LOAD 1 0V 15A FAN V2 A1 DC source VIN V1 Network Analyzer Isolation Transformer CHA ...

Page 13: ...ficiency 50 55 60 65 70 75 80 85 90 95 0 5 10 15 ILOAD Load Current A Efficiency VIN 8 V VIN 12 V VIN 14 V Figure 9 1 Efficiency 9 2 Load Regulation 0 98 0 985 0 99 0 995 1 1 005 1 01 1 015 1 02 0 5 10 15 ILOAD Load Current A V OUT Output Voltage V VIN 8 V VIN 12 V VIN 14 V Figure 9 2 Load Regulation www ti com Performance Data and Typical Characteristic Curves SLVU445C MARCH 2011 REVISED AUGUST 2...

Page 14: ...N 8 V to 14 V VOUT 1 0 V IOUT 15 A 9 4 Output Voltage Ripple Figure 9 4 Output Voltage Ripple VIN 12 V VOUT 1 0 V IOUT 15 A Performance Data and Typical Characteristic Curves www ti com 14 TPS56121 Step Down Converter Evaluation Module User s Guide SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 15: ... IOUT 15 A 9 6 Load Transient Figure 9 6 Load Transient VIN 12 V VOUT 1 0 V IOUT 0 A to 15 A www ti com Performance Data and Typical Characteristic Curves SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback TPS56121 Step Down Converter Evaluation Module User s Guide 15 Copyright 2021 Texas Instruments Incorporated ...

Page 16: ...Biased Start Up Waveform VIN 12 V VOUT 1 0 V IOUT 0 A Performance Data and Typical Characteristic Curves www ti com 16 TPS56121 Step Down Converter Evaluation Module User s Guide SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 17: ...rotection Waveform Ch1 VIN Ch2 EN SS Ch3 VOUT Ch4 IOUT 10 A div VIN 12 V VOUT 1 0 V IOUT 23 A www ti com Performance Data and Typical Characteristic Curves SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback TPS56121 Step Down Converter Evaluation Module User s Guide 17 Copyright 2021 Texas Instruments Incorporated ...

Page 18: ...hermal Image Figure 9 12 Thermal Image VIN 14 V VOUT 1 0 V IOUT 15 A without airflow Performance Data and Typical Characteristic Curves www ti com 18 TPS56121 Step Down Converter Evaluation Module User s Guide SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 19: ...r to view probe and evaluate the TPS56121 high current converter with integrated FETs in a small form factor high current application T I EXAS NSTRUMENTS Figure 10 1 TPS56121EVM 601 Top Assembly Drawing top view Figure 10 2 TPS56121EVM 601 Bottom Assembly Drawing bottom view www ti com EVM Assembly Drawings and PCB Layout SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback TPS56121 St...

Page 20: ...4 TPS56121EVM 601 Internal 1 top view EVM Assembly Drawings and PCB Layout www ti com 20 TPS56121 Step Down Converter Evaluation Module User s Guide SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated ...

Page 21: ... TPS56121EVM 601 Bottom Copper top view www ti com EVM Assembly Drawings and PCB Layout SLVU445C MARCH 2011 REVISED AUGUST 2021 Submit Document Feedback TPS56121 Step Down Converter Evaluation Module User s Guide 21 Copyright 2021 Texas Instruments Incorporated ...

Page 22: ...or chip 1 16 W 1 7 87 kΩ 0603 Std Std 1 R4 Resistor chip 1 16 W 1 20 5 kΩ 0603 Std Std 1 R5 Resistor chip 1 16 W 1 49 9 Ω 0603 Std Std 1 R6 Resistor chip 1 16 W 1 1 00 kΩ 0603 Std Std 1 R7 Resistor chip 1 16 W 1 30 1 kΩ 0603 Std Std 1 R8 Resistor chip 1 16 W 1 0 kΩ 0603 Std Std 1 R9 Resistor chip 1 8 W 1 1 00 Ω 0805 Std Std 1 R10 Resistor chip 1 16 W 1 100 kΩ 0603 Std Std 3 TP1 TP3 TP11 Test point...

Page 23: ...other than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control techniques are used to the extent TI deems necessary TI does not test all parameters of each EVM User s claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects...

Page 24: ... These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation...

Page 25: ...y for convenience and should be verified by User 1 Use EVMs in a shielded room or any other test facility as defined in the notification 173 issued by Ministry of Internal Affairs and Communications on March 28 2006 based on Sub section 1 1 of Article 6 of the Ministry s Rule for Enforcement of Radio Law of Japan 2 Use EVMs only after User obtains the license of Test Radio Station as provided in R...

Page 26: ... any interfaces electronic and or mechanical between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard User assumes all responsibility and liability for any improper or unsafe handling or use of the EVM by User or its employees affiliates contractors or designees 4 4 User assumes all...

Page 27: ...OR DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthermore no return of EVM s will be accepted if the package has been opened and no return of the EVM s will be accepted if they are damaged or otherwise not in a resalable condition If User feels it has...

Page 28: ...s are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for and you wi...

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