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Texas Instruments LM53625 QEVM Series User Manual Download Page 11

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Operation and Test Setup

11

SNVU526 – May 2016

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Copyright © 2016, Texas Instruments Incorporated

LM53625xQEVM and LM53635xQEVM User's Guide

Figure 11. PCB Layer 6 Composite Bottom

5

Operation and Test Setup

5.1

Efficiency Measurement

1. Connect power supply to posts VIN1 and GND1 and make sure the power supply provides sufficient

current.

NOTE:

There is no reverse polarity protection or fuse on the evaluation board.

2. Connect electronic load to posts VOUT and GND. For all power wires use preferable twisted lab wires.

If the power supply wires are very long > 50 cm please solder additional 470 µF, 50 V bulk capacitor to
posts VIN1 and GND1. Always use sufficient power wires and separate measurement sense wires.

NOTE:

These sense lines are not designed to carry power.

3. To accurately sense input and output voltage use the test points VINs, VOUTs, and GNDs.

Alternatively sense wires can be soldered directly over input capacitors C1 or C2 and the output
capacitors C01 or C02.

4. Make sure the IC is enabled by having jumper J2 set to [EN-VIN] and check test point EN is driven

high. While measuring Iq (unloaded input current) remove all the input and output voltage probes that
are most likely causing additional current draw.

NOTE:

If the jumper J1 is set to [MODE-FPWM] the part will have a lower efficiency at light loads by

maintaining the 2.1-MHz switch frequency. To measure the highest light load efficiency place
the Jumper J1 in [AUTO-MODE].

Summary of Contents for LM53625 QEVM Series

Page 1: ...LM53625xQEVM and LM53635xQEVM User s Guide Literature Number SNVU526 May 2016 ...

Page 2: ...nt 11 5 2 Measure Load Transient 12 5 3 Measure EMI 12 6 Posts Probes and Jumpers 13 6 1 VIN1 and GND1 Posts 13 6 2 VOUT and GND Posts 13 6 3 IN and IN Posts 13 6 4 EN and GND2 Probe 13 6 5 VINs VOUTs and GNDs Probe 13 6 6 BIAS and GNDS Probe 13 6 7 RESET and GND3 Probe 14 6 8 SYNC and GND3 Probe 14 6 9 Jumper J1 14 6 10 Jumper J2 14 6 11 Jumper J3 14 7 Bill of Materials 14 8 Efficiency and Line a...

Page 3: ...n many designs for start stop applications An open drain RESET output with filtering and Power GOOD delay provides a true indication of system status This feature negates the requirement for additional supervisory circuitry saving cost and board space Seamless transition between PWM and PFM operation AUTO MODE along with a low quiescent current ensures high efficiency at all loads The Texas Instru...

Page 4: ...NPUT VIN1 and GND1 IN IN Power Supply Input Power Input for EMI Test typical 13 5 V range 3 5 to 36 V transient typical 13 5 V Power Output VOUT and GND Power Output to Load typical 3 3 V or 5 V JUMPERS J1 FPWM pin J2 ENABLE pin J3 RESET pin Auto Mode or Forced PWM Enable LM536325x and LM536335x Open drain output Set Default AUTO MODE Set Default EN VIN Optional RESET VOUT TEST POINTS GNDs GND2 an...

Page 5: ...02 LM53635AQEVM ADJ 3 5A w o SS 003 004 005 LM53635LQEVM 5 0V 3 5A with SS LM53635MQEVM ADJ 3 5A with SS LM53635NQEVM 3 3V 3 5A with SS 1 2 J3 HTSW 102 07 G S 1 2 3 J1 HTSW 103 07 G S Vout 3 3V fixed 5 0V adjust 5 0V fixed 5 0V adjust 3 3V fixed EN VIN VIN BOOT 4 7µF Cvcc 100k R6 RESET 0 1µF Cbias VOUT VOUT VIN VOUTs GNDs VINs 2 2µH L1 SYNC 3 0 Rbias AGND GND NTG Net Tie Copyright 2016 Texas Instr...

Page 6: ...S 1 2 3 J1 HTSW 103 07 G S Vout 3 3V fixed 5 0V adjust 5 0V fixed 5 0V adjust 3 3V fixed EN VIN VIN BOOT 4 7µF Cvcc 100k R6 RESET 0 1µF Cbias VOUT VOUT VIN VOUTs GNDs VINs 2 2µH L1 SYNC 3 0 Rbias AGND GND NTG Net Tie Copyright 2016 Texas Instruments Incorporated Schematics www ti com 6 SNVU526 May 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM53625xQEVM and LM5...

Page 7: ...e 8 shows the PCB Layout for each Cu Layer Top Layer1 and Bottom Layer4 are constructed using large filled Cu areas connected to GND This is done to improve thermal performance as well as improve overall EMI performance Mid Layer 2 is constructed using a large GND plane as well The intention here is to minimize loop inductance by placing metal right under the Top Layer 1 traces minimizing the cros...

Page 8: ...SNVU526 May 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM53625xQEVM and LM53635xQEVM User s Guide Figure 5 PCB Layout Top Layer 1 Top View Figure 6 PCB Layout Mid Layer 2 GND Plane Top View ...

Page 9: ...2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM53625xQEVM and LM53635xQEVM User s Guide Figure 7 PCB Layer Mid Layer 3 Top View Figure 8 PCB Layer Bottom Layer 4 Flipped View as Seen From Bottom of Board ...

Page 10: ...ww ti com 10 SNVU526 May 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM53625xQEVM and LM53635xQEVM User s Guide Figure 9 PCB Layer 5 Dimensions Figure 10 PCB Layer 7 Composite Top ...

Page 11: ...V bulk capacitor to posts VIN1 and GND1 Always use sufficient power wires and separate measurement sense wires NOTE These sense lines are not designed to carry power 3 To accurately sense input and output voltage use the test points VINs VOUTs and GNDs Alternatively sense wires can be soldered directly over input capacitors C1 or C2 and the output capacitors C01 or C02 4 Make sure the IC is enable...

Page 12: ...er the output capacitors C01 or C02 Make sure to connect scope probe GND ring directly to the output capacitor GND pad for minimal ground loop Ground loops can introduce ringing in observed waveforms which is an artifact not present on the PCB Alternatively use differential probe over output capacitors C01 or C02 Do not use wires to differential probe and always probe directly with shortest possib...

Page 13: ... ferrite bead for high frequency filtering If one wishes to measure a setup with a common mode choke add the choke and remove bypass resistors R1 and R2 6 4 EN and GND2 Probe EN and GND2 probe can be used to measure the enable voltage or drive it from external source If an external source is used make sure to remove jumper J2 By default J2 jumper is set EN to VIN 6 5 VINs VOUTs and GNDs Probe VINs...

Page 14: ...and pulls the enable pin through a 100 kΩ resistor to Vin If an external source drives the EN pin then remove jumper J2 and use probe points EN and GND2 or use a 3 pin wire connector directly plugged over J2 6 11 Jumper J3 Jumper J3 pulls the open drain RESET output to VOUT through a 100 kΩ resistor If another RESET output level is needed use probe point RESET and pullup resistor to external refer...

Page 15: ...ns RNL0022A LM536253QRNLRQ1 RFBB 0 DNP RFBT 1 0 Ω 2 5 3 5 A Synchronous Buck Regulator for Automotive Applications RNL0022A CRCW04020000Z0ED CFF 0 DNP Variant 002 LM53635AQEVM Adjustable 5 V 3 5 A Without Spread Spectrum U1 1 2 5 3 5 A Synchronous Buck Regulator for Automotive Applications RNL0022A LM53635AQRNLRQ1 RFBB 1 12 1 k RES 12 1 k 1 0 063 W 0402 CRCW040212K1FKED RFBT 1 49 9 k RES 49 9 k 1 ...

Page 16: ...1 5 2 2 5 3 3 5 50 55 60 65 70 75 80 85 90 95 100 D006 5 5Vin 8Vin 12Vin 13 5Vin 18Vin 36Vin Efficiency and Line and Load Regulation www ti com 16 SNVU526 May 2016 Submit Documentation Feedback Copyright 2016 Texas Instruments Incorporated LM53625xQEVM and LM53635xQEVM User s Guide 8 Efficiency and Line and Load Regulation The variant of the board LM53635LQEVM is used for all measurements and curv...

Page 17: ...orporated LM53625xQEVM and LM53635xQEVM User s Guide 8 1 Load Transients VOUT 5 V IOUT 0 mA to 3 5 A FPWM TR TF 1 µs Figure 18 LM53635LQEVM Load Regulation VOUT 5 V IOUT 10 mA to 3 5 A AUTO TR TF 1 µs Figure 19 LM53635LQEVM Load Transients 8 2 Conducted EMI Figure 20 Conducted EMI Setup Front View Figure 21 Conducted EMI Setup Side View ...

Page 18: ... Texas Instruments Incorporated LM53625xQEVM and LM53635xQEVM User s Guide Figure 22 LM53635LQEVM Low Frequency Conducted EMI Results for 5 Vout With Spread Spectrum Green Average and Yellow Peak Figure 23 LM53635LQEVM High Frequency Conducted EMI Results for 5 Vout With Spread Spectrum Green Average and Yellow Peak ...

Page 19: ...ring the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warranted for the remainder of the original warranty period Replaced EVMs shall be warranted for a new full ninety 90 day warranty period 3 ...

Page 20: ... by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la rég...

Page 21: ... connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even with the inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors cu...

Page 22: ...F REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Page 23: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

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