Texas Instruments TPS543320EVM Скачать руководство пользователя страница 20 | Manualshive

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Texas Instruments TPS543320EVM Скачать руководство пользователя страница 20

3.9 Start-up and Shutdown with VIN

show the start-up and shutdown waveforms for U2 with VIN. In

, the VIN

voltage ramps up and output voltage ramps up after the input and EN pin voltages reach their respective UVLO
threshold. In

, the VIN voltage ramps down and the TPS543320 shuts down when the input or EN

pin voltage reach their respective UVLO threshold. The rate at which VIN ramps down changes as soon as the
TPS543320 is disabled because it is no longer loading the input supply.

Figure 3-28. U2 Start-up with VIN – 1.5-A Load

Figure 3-29. U2 Shutdown with VIN – 1.5-A Load

Test Setup and Results

20

TPS543320 SWIFT™ Step-Down Converter Evaluation Module User's Guide

SLVUC07A – DECEMBER 2020 – REVISED MAY 2021

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Copyright © 2021 Texas Instruments Incorporated

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Содержание TPS543320EVM

Страница 1: ...e 17 3 7 Synchronizing to a Clock 18 3 8 Start up and Shutdown with EN 19 3 9 Start up and Shutdown with VIN 20 3 10 Hiccup Current Limit 21 3 11 Overvoltage Protection 22 3 12 Thermal Performance 23...

Страница 2: ...Performance Both 3 A Load 23 Figure 3 37 U2 Thermal Performance Both 3 A Load 23 Figure 4 1 Top Side Composite View 24 Figure 4 2 Bottom Side Composite View Viewed From Bottom 24 Figure 4 3 Top Layer...

Страница 3: ...100 mm2 The second design is designed to demonstrate the high efficiency that can be achieved when designing with the TPS543320 regulator The second design also includes jumpers that can be used to ea...

Страница 4: ...O 3 8 V Output voltage setpoint 1 8 V Output current range VIN 4 V to 18 V 0 3 A Line and load regulation VIN 4 V to 18 V IO 0 A to 3 A 0 1 Load transient response IO 0 75 A to 2 25 A Voltage change 7...

Страница 5: ...A to 2 25 A Voltage change 200 mV Recovery time to within 0 5 28 s Loop bandwidth RO 1 32 J18 short pins 3 and 4 56 kHz Phase margin 48 degrees Input ripple voltage IO 3 A 130 mVPP Output ripple volt...

Страница 6: ...ation 1 After changing R7 the feedfoward capacitor C8 can also need to be changed OUT FBT FBB REF V R R 1 V u 1 In the U2 design there are a few ways to set the output voltage First jumper J14 can be...

Страница 7: ...n in Table 2 3 If the desired option is not available change one of the resistors to the value which sets the desired option In the U1 design change the MODE resistor to the value which sets the desir...

Страница 8: ...ach connection With the maximum current limit setting the maximum load current capability is near 5 A before the TPS543320 goes into current limit Wire lengths must be minimized to reduce losses in th...

Страница 9: ...ader to connect enable divider to U2 Remove shunt to float EN pin of U2 to use internal UVLO to enable U2 J14 VOUT Select U2 VOUT selection header Use shunt to set output voltage See Table 2 1 J15 ENS...

Страница 10: ...e plot measurements TP23 EN_U2 U2 EN test point If you are applying an external voltage it must be kept below the absolute maximum voltage of the EN pin of 6 V TP24 VO_ADJ U2 Test point for injecting...

Страница 11: ...500 and the efficiency measurement will include the power lost in this external resistance Remove the shunts from J11 and J13 as a small amount of power is dissipated in the EN resistor divider connec...

Страница 12: ...1 2 4 2 7 3 50 55 60 65 70 75 80 85 90 95 100 VOUT 1 8 V VOUT 2 5 V VOUT 3 3 V VOUT 5 V VIN 12 V fSW 1000 kHz Figure 3 3 U2 Efficiency 1000 kHz Switching Frequency with Different Output Voltages Outpu...

Страница 13: ...812 1 814 1 816 1 818 1 82 IOUT 0 A IOUT 1 5 A IOUT 3 A Figure 3 6 U1 Line Regulation IOUT A V OUT V 0 0 5 1 1 5 2 2 5 3 3 3 3 305 3 31 3 315 3 32 VIN 5 V VIN 12 V VIN 18 V Figure 3 7 U2 Load Regulat...

Страница 14: ...sistors on the EVM provide a gain of 10 A V With this gain a 1 5 A step will result in 150 mV at the ISNS test point Note To use the load transient circuit with U1 move R27 to R28 Figure 3 11 and Figu...

Страница 15: ...op Gain with Different Ramp Settings Frequency Hz Phase q 100 1000 10000 100000 1000000 200 150 100 50 0 50 100 150 200 Ramp 4 pF Ramp 2 pF Ramp 1 pF Figure 3 14 U2 Loop Phase with Different Ramp Sett...

Страница 16: ...for U1 and TP29 for U2 Figure 3 15 U1 Output Ripple No Load Figure 3 16 U1 Output Ripple 3 A Load Figure 3 17 U2 Output Ripple No Load Figure 3 18 U2 Output Ripple 3 A Load Test Setup and Results www...

Страница 17: ...1 and measured across C13 for U2 Figure 3 19 U1 Input Ripple No Load Figure 3 20 U1 Input Ripple 3 A Load Figure 3 21 U2 Input Ripple No Load Figure 3 22 U2 Input Ripple 3 A Load www ti com Test Setup...

Страница 18: ...he EVM In this waveform after ten pulses the TPS543320 begins synchronizing to the clock After the clock goes away the TPS543320 switches at 70 of the internal clock frequency for four pulses then tra...

Страница 19: ...internal LDO start up relative to the EN pin A shunt on the ENOFF_U1 jumper or RDIV_VIN can be used to test the EN start up of U1 and U2 respectively When the shunt is removed from ENOFF_U1 EN is rele...

Страница 20: ...3320 shuts down when the input or EN pin voltage reach their respective UVLO threshold The rate at which VIN ramps down changes as soon as the TPS543320 is disabled because it is no longer loading the...

Страница 21: ...an overload on the output The TPS543320 tries to restart after the Hiccup wait time period but the overload was still present on the output In the next restart attempt the overload has been removed so...

Страница 22: ...ference voltage of 0 5 V and is stepped up to 3 3 V The TPS543320 attempts to restart immediately after the OVP fault is cleared It does not wait for the hiccup time period Figure 3 32 U2 Overvoltage...

Страница 23: ...ak time was used before taking each measurement Figure 3 34 U1 Thermal Performance 3 A Load and U2 off Figure 3 35 U2 Thermal Performance 3 A Load and U1 off Figure 3 36 U1 Thermal Performance Both 3...

Страница 24: ...D pins of the IC to help maximize the thermal performance Each TPS543320 circuit has its own dedicated ground are for quiet analog ground that is connected to the main power ground plane at a single p...

Страница 25: ...ematic and Bill of Materials This section presents the TPS543320EVM schematic and bill of materials www ti com Schematic and Bill of Materials SLVUC07A DECEMBER 2020 REVISED MAY 2021 Submit Document F...

Страница 26: ...schematic for U2 Figure 5 1 U1 Schematic Schematic and Bill of Materials www ti com 26 TPS543320 SWIFT Step Down Converter Evaluation Module User s Guide SLVUC07A DECEMBER 2020 REVISED MAY 2021 Submi...

Страница 27: ...www ti com Schematic and Bill of Materials SLVUC07A DECEMBER 2020 REVISED MAY 2021 Submit Document Feedback TPS543320 SWIFT Step Down Converter Evaluation Module User s Guide 27 Copyright 2021 Texas I...

Страница 28: ...4030 122MEB Coilcraft L2 1 3 3 H Shielded Power Inductor 3 3 H 20 7 8 A 14 6 mO max SMT_IND_5MM48_5MM28 XEL5050 332MEB Coilcraft LBL1 1 Thermal Transfer Printable Labels 0 650 W x 0 200 H 10 000 per r...

Страница 29: ...TP17 TP19 TP20 TP33 8 Test Point Multipurpose Black TH Black Multipurpose Testpoint 5011 Keystone TP9 TP22 TP24 TP26 TP27 TP34 6 Test Point Multipurpose White TH White Multipurpose Testpoint 5012 Keys...

Страница 30: ...nector SMBR004D00 JAE Electronics 6 Revision History NOTE Page numbers for previous revisions may differ from page numbers in the current version Changes from Revision December 2020 to Revision A May...

Страница 31: ...ther 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 tec...

Страница 32: ...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 in...

Страница 33: ...instructions set forth by Radio Law of Japan which includes but is not limited to the instructions below with respect to EVMs which for the avoidance of doubt are stated strictly for convenience and s...

Страница 34: ...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 electr...

Страница 35: ...R 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 Furthe...

Страница 36: ...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...

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