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LMR36015FSCEVM
User Manual
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Texas Instruments LMR36015FSCEVM, LMR36015 EVM Series, LMR36015AEVM User Manual

User's Guide
SNVU636–November 2018

LMR36015xxxEVM User’s Guide

The EVM options are found in Table 1.
Table 1. Device and Package Configurations
EVM U1 FREQUENCY FPWM SPREAD SPECTRUM CURRENT
LMR36015AEVM LMR36015-Q1 400 kHz Disabled Disabled 1.5 A
LMR36015FSCEVM LMR36015-Q1 2.1 MHz Enabled Enabled 1.5 A
Contents
1 Posts, Probes, and Jumpers ............................................................................................... 3
2 Operation ..................................................................................................................... 5
3 Schematic..................................................................................................................... 6
4 Board Layout ................................................................................................................. 7
5 Bill of Materials ............................................................................................................. 13
6 Test Results................................................................................................................. 14
1 EVM Board Connections.................................................................................................... 3
2 Jumper Locations............................................................................................................ 4
3 LMR36015xxxEVM Schematic............................................................................................. 6
4 Top View of EVM ............................................................................................................ 7
5 EVM Top Copper Layer..................................................................................................... 8
6 EVM Mid Layer One......................................................................................................... 9
7 EVM Mid Layer Two ....................................................................................................... 10
8 EVM Bottom Copper Layer ............................................................................................... 11
9 EVM Bottom View.......................................................................................................... 12
10 LMR36015AEVM 5 V 11 LMR36015AEVM 3.3 V 12 LMR36015AEVM 5 V 13 LMR36015AEVM 3.3 V 14 LMR36015AEVM 5 V 15 LMR36015AEVM 3.3 V 16 LMR36015AEVM 5 V 17 LMR36015AEVM 3.3 V 18 LMR36015A Low Frequency Conducted EMI Results for 5 V 19 LMR36015AEVM High Frequency Conducted EMI Results for 5 V
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List of Figures
Efficiency ...................................................................................... 14
OUT
Efficiency .................................................................................... 14
OUT
Load Regulation .............................................................................. 14
OUT
Load Regulation............................................................................ 14
OUT
Load Transient, 24 VIN, I
OUT
Load Transient, 24 VIN, I
OUT
Start-Up Waveform, 24 V
OUT
Start-Up Waveform, 24 V
OUT
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= 0 A to 1.5 A, TR= T
OUT
= 0 A to 1.5 A, TR= T
OUT
,1.5 A Load .................................................... 15
IN
,1.5 A Load.................................................. 15
IN
(Blue-Average and Yellow-Peak) ........... 16
OUT
OUT
= 1 µs.............................. 15
F
= 1 µs............................ 15
F
(Blue-Average and Yellow-Peak)...... 16
LMR36015xxxEVM User’s Guide
1
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20 LMR36015FSCEVM 5 V 21 LMR36015FSCEVM 3.3 V 22 LMR36015FSCEVM 5 V 23 LMR36015FSCEVM 3.3 V 24 LMR36015FSCEVM 5 V 25 LMR36015FSCEVM 3.3 V 26 LMR36015FSCEVM 5 V 27 LMR36015FSCEVM 3.3 V 28 LMR36015FSCEVM Low Frequency Conducted EMI Results for 3.3 V
29 LMR36015FSCEVM High Frequency Conducted EMI Results for 3.3 V
1 Device and Package Configurations ...................................................................................... 1
2 Bill of Materials ............................................................................................................. 13
Trademarks
All trademarks are the property of their respective owners.
Efficiency................................................................................... 17
OUT
Efficiency................................................................................. 17
OUT
Load Regulation........................................................................... 17
OUT
Load Regulation ........................................................................ 17
OUT
Load Transient, 12 VIN, I
OUT
Load Transient, 12 VIN, I
OUT
Start-Up Waveform, 12 V
OUT
Start-Up Waveform, 24 V
OUT
Average and Yellow-Peak)................................................................................................ 19
Average and Yellow-Peak)................................................................................................ 19
= 0 A to 1.5 A, TR= T
OUT
= 0 A to 1.5 A, TR= T
OUT
,1.5 A Load................................................. 18
IN
,1.5 A Load .............................................. 18
IN
OUT
= 1 µs .......................... 18
F
= 1 µs........................ 18
F
With Spread Spectrum (Blue-
With Spread Spectrum (Blue-
OUT
List of Tables
2
LMR36015xxxEVM User’s Guide
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VOUT
Connection:
Load
VIN
Connection
with EMI Filter:
Input Supply
VIN
Connection:
Input Supply
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1 Posts, Probes, and Jumpers

This section describes the test points and connectors on the EVM and how to properly connect, set up, and use the LMR36015AEVM and the LMR36015FSCEVM.

1.1 Screw Terminal Connectors

The screw terminals on the top of the board can be used for connecting to the input and output of the EVM. See Figure 1 for the screw terminal connections. The functions of the screw terminal connections are:
• VIN - Input supply to EVM. Connect to a suitable input supply. See LMR36015-Q1 data sheet for input supply requirements.
• GND - System ground.
• IN+ - Input supply to EVM including an EMI filter. Connect to a suitable input supply. See LMR36015-
Q1 data sheet for input supply requirements.
• IN– - System ground including an EMI filter.
• VOUT - Output of EVM — connect to desired load.
Posts, Probes, and Jumpers
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Figure 1. EVM Board Connections
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Power Good
Jumper
Enable Jumper
Feedback
Jumper
Posts, Probes, and Jumpers

1.2 Jumpers

See Figure 2 for jumper locations.
• EN - This jumper allows the ENABLE input to be connected to either GND (OFF) or VIN (ON). The 2­to-3 position enables the device; while the 1-to-2 position disables the device. Remove this jumper to allow an external logic signal to control the EN function.
• VOUT - Use this jumper to select one of the two pre-defined output voltages. The 2-to-3 position provides a 3.3-V output; while the 1-to-2 position provides a 5-V output.
• PGOOD - Use this jumper to select the PGOOD pullup configuration. PGOOD can be connected to either VOUT or VCC. The 2-to-3 position connects PGOOD to VOUT, while the 1-to-2 position connects PGOOD to VCC.
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1.3 Test Points

• VOUTS - Output voltage sense connection; connect to DMM. Also, use for frequency response analyzer connection.
• VINS - Input voltage sense connection; connect to DMM.
• GNDS1 and GNDS2 - Ground sense point for analog measurements; connect to DMM.
• VCC - Test point to measure internal VCC of device; approximately 5 V.
• EN - Connection for external EN logic input. Remove EN jumper and connect controlling logic to EN test point for external enable control.
• PGOOD - Power-good flag output. This test point is connected to VCC or VOUT through a 100-kΩ resistor. The power-good function can be monitored at this test point.
Figure 2. Jumper Locations
4
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2 Operation

2.1 Quick Start

1. Connect the voltage supply between VIN and GND screw terminal connectors using short and thick wires.
2. Connect the load between VOUT and GND screw terminal connectors using short and thick wires.
3. Set the supply voltage at an appropriate level between 4.2 V to 60 V. Set the current limit of the supply to an appropriate level.
4. Turn on the power supply. With the default configuration, the EVM powers up and provides V
5. Monitor the output voltage. The maximum load current must be 1.5 A with the LMR36015-Q1 device.

2.2 Efficiency Measurement

1. Connect power supply to VIN and GND screw terminal connectors 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 VOUT and GND screw terminal connectors. For all power wires it is preferable to use twisted lab wires. If the power supply wires are very long > 50 cm, solder an additional 470-µF, 100-V bulk capacitor to posts VIN and GND. Use sufficient power wires to avoid voltage drops, and use short sense probe connection for the measurement.
Operation
= 5 V.
OUT
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 C capacitors CO1or CO2.
4. Make sure the IC is enabled by having jumper J5 set to [EN-VIN] and check that 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.

2.3 Measure Load Transient

1. Connect power supply to VIN and GND screw terminal connectors, and make sure the power supply can provide sufficient peak current.
NOTE: There is no reverse polarity protection or fuse on the evaluation board.
2. Connect transient load to VOUT and GND screw terminal connectors. For all power wires use preferable twisted lab wires. If the power supply wires are very long > 50 cm, solder an additional 470­µF, 100-V bulk capacitor to posts VIN and GND. Use short sense probe connection for the measurement.
3. To accurately sense the output voltage, place the scope probe directly over the output capacitors C or CO2. 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 and not present on the PCB. Alternatively, use differential probe over output capacitors CO1or CO2. Do not use wires to differential probe and always probe directly with shortest possible pins. Make sure the IC is enabled by having jumper J5 set to [EN-VIN] and check test point EN is driven high and not drooping during the load transient.
IN1
or C
and the output
IN2
O1
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Schematic

3 Schematic

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Figure 3. LMR36015xxxEVM Schematic
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4 Board Layout

Board Layout
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Figure 4. Top View of EVM
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Board Layout
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Figure 5. EVM Top Copper Layer
8
LMR36015xxxEVM User’s Guide
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SNVU636–November 2018
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