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LM63635EVM
User Manual
19 pgs6.12 Mb0

Texas instruments LM63635EVM User Manual

User's Guide
SNVU617–January 2020
LM63635EVM EVM User’s Guide
down Voltage Converter Data Sheet for additional features, detailed description, and available options.
The EVM options are found in Table 1.
Table 1. Device and Package Configurations
EVM DEVICE
LM63635EVM LM63635DQPWPRQ1 400 kHz / 3.25 A
FREQUENCY/OUTPUT
CURRENT
Contents
1 Setup .......................................................................................................................... 3
2 Operation ..................................................................................................................... 6
3 Performance Curves ........................................................................................................ 6
4 Schematic..................................................................................................................... 7
5 Board Layout ................................................................................................................. 8
6 Bill of Materials ............................................................................................................. 12
1 EVM Board Connections.................................................................................................... 3
2 EVM Card Edge Connections.............................................................................................. 4
3 Jumper Locations............................................................................................................ 4
4 FRA Setup.................................................................................................................... 5
5 Efficiency Without Input Filter AUTO Mode, V 6 Efficiency Without Input Filter AUTO Mode, V
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List of Figures
= 3.3V, f
OUT
= 5 V, f
OUT
Copyright © 2020, Texas Instruments Incorporated
= 400 KHz............................................. 6
SW
= 400 KHz .............................................. 6
SW
LM63635EVM EVM User’s Guide
1
7 LM63635EVM Schematic................................................................................................... 7
8 Top View of EVM ............................................................................................................ 8
9 Bottom View of EVM ........................................................................................................ 9
10 EVM Top Copper Layer..................................................................................................... 9
11 EVM Mid Layer One ....................................................................................................... 10
12 EVM Mid Layer Two ....................................................................................................... 10
13 EVM Bottom Copper Layer ............................................................................................... 11
1 Device and Package Configurations ...................................................................................... 1
2 BOM for LM63635EVM.................................................................................................... 12
Trademarks
All trademarks are the property of their respective owners.
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List of Tables
2
LM63635EVM EVM User’s Guide
Copyright © 2020, Texas Instruments Incorporated
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LOAD
POWER SUPPLY
DMM
(+)
(-)
(+)
(-)
(-)
(+)
DMM
(+)
(-)
VIN
VOUT
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1 Setup
This section describes the test points and connectors on the EVM and how to properly connect, set up, and use the LM63635EVM. Either the test points on the top of the board or the card edge connector can be used for connections. See Figure 1 for the top of board connections and Figure 2 for the card edge connections. The following lists the functions of the connections:
VIN_EMI— Input supply to EVM. Connect to a suitable input supply. See the LM636x5-Q1 3.5-V to 36-V,
GND— System ground VOUT— Output of EVM. Connect to desired load. VOUTS— Output voltage sense connection (do not use for current; sense only) VINS— Input voltage sense connection (do not use for current; sense only) GNDS— Ground sense point for analog measurements (do not use for current; sense only)
Setup
1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for input supply
requirements.
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Figure 1. EVM Board Connections
Copyright © 2020, Texas Instruments Incorporated
LM63635EVM EVM User’s Guide
3
5V or 3.3V
Output Voltage
Selection Jumper
FPWM or Auto
Selection Jumper
GND VOUT
GNDS
VOS
TOP FRONT
BOTTOM FRONT
VIS
VINEMI
INPUT
SUPPLY
LOAD
(+) (-)
(-) (+)
(+)
(-)
DMMDMM
(-)(+)
(+)(-)
Filtered VOUT *
(+) (-)
CM Choke
Input *
* = Optional Connections
Setup
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1.1 Jumpers
See Figure 3 for jumper locations.
J1— This jumper allows the VOUT_SEL pin input to be connected to either VCC or GND for a fixed
J2— This jumper allows SYNC to be connected in this mode to either VCC or GND. When connected to
Figure 2. EVM Card Edge Connections
output voltage selection of 3.3 V or 5 V, respectively. Alternatively, the jumper can be left open and a R
VOUTSEL
can be populated with 10 kΩ to have the part operate with an adjustable output voltage.
See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter
Data Sheet for feedback resistor calculation.
VCC, the part operates in forced pulse width modulation (FPWM) mode and when the SYNC pin is connected to GND, the part operates in auto mode where pulse frequency modulation (PFM) is engaged.
4
LM63635EVM EVM User’s Guide
Figure 3. Jumper Locations
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B
Signal
Injection
^_/v‰µšš}
network analyzer
^_/v‰µšš}
network analyzer
A
GND
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1.2 Test Points
• VIN_EMI - Input supply to EVM. Connect to a suitable input supply. See the LM636x5-Q1 3.5-V to 36-
V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for input supply
requirements.
• GND - System power ground
• VOUT - Power output of EVM. Connect to desired load.
• VOUTS - Output voltage sense connection. Connect to DMM. It is also used for frequency response analyzer connection (do not use for current; sense only).
• VINS - Input voltage sense connection. Connect to DMM (do not use for current; sense only).
• GNDS - Ground sense point for analog measurements. Connect to DMM (do not use for current; sense only).
• EN - Connection for external EN logic input. Connect controlling logic to EN test point for external enable control.
• RESET - Connected to the RESET pin of the IC. It is used as a flag output. The reset function can be monitored at this test point. Pullup resistor, R resistor is 100 kΩ.
• SYNC - Connected to the SYNC pin of the IC. Connection to an external clock or synchronization signal enables the IC switching frequency to follow the synchronization signal.
• TPGND1, TPGND2 - System power ground
, must be populated. A typical value for pullup
PULLUP
Setup
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Figure 4. FRA Setup
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LM63635EVM EVM User’s Guide
5
Output Current (A)
Efficiency (%)
0.001 0.01 0.1 1 55
65
70
75
80
85
90
95
eff_
8V
13.5V 18V 24V
Output Current (A)
Efficiency (%)
0.001 0.01 0.1 1 55
70
75
80
85
90
95
100
eff_
8V
13.5V 18V 24V
Operation
2 Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use. The EN pin is pulled up to VIN with a 100-kΩ resistor.
The output voltage of the EVM can be selected by the VOUT jumper to either 3.3 V or 5 V. Other values of output voltage can be programmed by removing the jumper on J1 before powering on the device and changing the value of R and the output capacitance need to be changed. See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A
Automotive Step-down Voltage Converter Data Sheet for more information.
To us the RESET function, a pullup resistor is required. A place for this resistor is provided on the bottom of the PCB. Values of 10 kΩ to 100 kΩ are appropriate. Be sure to limit the voltage on this pullup to less than the specified Abs max for this pin.
The EVM is equipped with several EMI filter options. These are accessed through the edge connector as shown in Figure 2. Refer to Figure 2, Figure 7, and Table 2 for details.
Loop gain measurements can be made using the setup shown in Figure 4. The EVM has been designed for maximum flexibility regarding component selection. This allows the user
to place preferred components such as the inductor, the capacitors, or both, on the board and test the performance of the regulator. This way the power supply system can be tested before committing the design to production.
3 Performance Curves
FBT
and R
on the EVM. In addition, it is possible that the values of the inductor
FBB
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Figure 5. Efficiency Without Input Filter AUTO Mode, V
6
LM63635EVM EVM User’s Guide
= 3.3V, fSW= 400 KHz
OUT
Copyright © 2020, Texas Instruments Incorporated
Figure 6. Efficiency Without Input Filter
AUTO Mode, V
= 5 V, fSW= 400 KHz
OUT
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