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User’s Guide
LM63635DNEVM EVM User’s Guide
ABSTRACT
The Texas Instruments LM63635DNEVM evaluation module (EVM) helps designers evaluate the operation and
performance of the LM636x5CAQDRRQ1 buck regulator. The LM636x5CAQDRRQ1 is a family of easy-to-use
synchronous step-down DC/DC converters capable of driving up to 3.5 A of load current from an input voltage
of 3.5 V to 36 V. 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 additional features, detailed description, and available options. Please note that this EVM
is designed for the LM636x5CAQDRRQ1. This device has a different pin-out than the other devices in the
LM636x5-Q1 product family.
Table 1-1. Device and Package Configurations
EVM
DEVICE
LM63635DNEVM LM63635CAQDRRQ1
OUTPUT
VOLTAGE
5V
OUTPUT
CURRENT
SWITCHING
FREQUENCY
PACKAGE
3.25 A
2.1 MHz
DRR0012
(WSON)
Figure 1-1. LM63635DNEVM Board Image
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Table of Contents
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Table of Contents
1 Setup........................................................................................................................................................................................3
2 Operation.................................................................................................................................................................................6
3 Performance Curves...............................................................................................................................................................6
4 Schematic................................................................................................................................................................................7
5 Board Layout...........................................................................................................................................................................8
6 Bill of Materials..................................................................................................................................................................... 10
List of Figures
Figure 1-1. LM63635DNEVM Board Image.................................................................................................................................1
Figure 1-1. EVM Board Connections........................................................................................................................................... 3
Figure 1-2. EVM Card Edge Connections................................................................................................................................... 4
Figure 1-3. Jumper Locations...................................................................................................................................................... 4
Figure 1-4. FRA Setup.................................................................................................................................................................5
Figure 3-1. Efficiency: AUTO Mode, VOUT = 5 V, fSW = 2100 kHz............................................................................................... 6
Figure 3-2. Line and Load Regulation: AUTO Mode, VOUT = 5 V, fSW = 2100 kHz......................................................................6
Figure 4-1. LM63635DNEVM Schematic.....................................................................................................................................7
Figure 5-1. Top View of EVM....................................................................................................................................................... 8
Figure 5-2. Bottom View of EVM..................................................................................................................................................8
Figure 5-3. EVM Top Copper Layer............................................................................................................................................. 9
Figure 5-4. EVM Mid Layer One.................................................................................................................................................. 9
Figure 5-5. EVM Mid Layer Two.................................................................................................................................................. 9
Figure 5-6. EVM Bottom Copper Layer....................................................................................................................................... 9
List of Tables
Table 1-1. Device and Package Configurations...........................................................................................................................1
Table 6-1. BOM for LM63625DNEVM........................................................................................................................................10
Trademarks
All trademarks are the property of their respective owners.
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Setup
1 Setup
This section describes the test points and connectors on the EVM and how to properly connect, set up, and use
the LM63635DNEVM. Either the banana jacks on the top of the board or the card edge connector can be used
for connections. See Figure 1-1 for the top of board connections and Figure 1-2 for the card edge connections.
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
details. The following lists the functions of the connections:
VINEMI
Input supply to EVM. Connect to a suitable input supply.
GND
System ground.
VOUT
Output of EVM. Connect to desired load.
VOS
Output voltage sense connection (do not use for power; sense only).
VIS
Input voltage sense connection (do not use for power; sense only).
GNDS
Ground sense point for analog measurements (do not use for power; sense only).
Output
Voltage
DMM
(-)
(+)
(+)
LOAD
(-)
(-)
Input Power
Supply
(+)
(-)
(+)
Input Voltage
DMM
Figure 1-1. EVM Board Connections
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Setup
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(+)
INPUT
SUPPLY
(+)
(-) (-)
LOAD
* = Optional Connections
GND
VINEMI
VOUT
VIS
VOS
TOP FRONT
GNDS
BOTTOM FRONT
(+)
(-)
CM Choke
Input *
(+)
Input
Voltage
(-)
(-)
DMM
Output
Voltage
(+)
DMM
Figure 1-2. EVM Card Edge Connections
1.1 Jumpers
See Figure 1-3 for jumper locations.
MODE This jumper allows the selection of either AUTO mode or FPWM mode. In addition, by removing this
jumper and supplying a clock signal to the SYNC/MODE test point, the device can by synchronized to
an external clock.
EN
This jumper turns the device on or off. In addition, by removing this jumper and supplying a signal to the
EN test point, the device can be controlled externally.
Mode Selec on
Jumper
EN Control
Jumper
Figure 1-3. Jumper Locations
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Setup
1.2 Test Points
•
•
•
•
•
•
•
•
•
•
•
VINEMI - Input supply to EVM. Connect to a suitable input supply.
GND - System power ground.
VOUT - Power output of EVM. Connect to desired load.
VOS - Output voltage sense connection. Connect to DMM.
VINS - Input voltage sense connection. Connect to DMM.
GNDS - Ground sense point for analog measurements. Connect to DMM.
EN - Connected to the EN input of the device.
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.
SYNC/MODE - Connected to the SYNC/MODE pin of the IC.
VCC - Connected to the VCC output of the device. Can be used for logic level pullups, if needed.
OPEN PADS - Connections for frequency response analyzer (on bottom of board) to take Bode plots. See
Figure 1-4 for details of connections.
B
A
^ _ /v‰µš š}
network analyzer
^ _ /v‰µš š}
network analyzer
Signal
Injection
Figure 1-4. FRA Setup
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Operation
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2 Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use.
The EVM is configured for a 5-V output. The output voltage can be changed by changing the values of
resistors R2 (RFBT) and or R3 (RFBB). Depending on the output capacitors and the desired loop performance, a
feed-forward capacitor, C5 (CFF) can be desirable. A space is available on the EVM for this optional component.
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.
The switching mode of the EVM can be changed by using the MODE jumper; this selection can be made
on-the-fly.
The RESET flag is used to indicate when the output voltage is within +/- 5 % of the regulated value. This EVM is
configured with a 100 kΩ pull-up resistor from RESET to VCC (about 5V). A low on RESET indicates the output
voltage is out of regulation. The pull-up resistor can be removed and the open-drain RESET pin can be used to
control a system processor from the EVM. Be sure to limit the voltage on the RESET to less than the specified
Abs max for this pin.
Some components in the EMI filter are not populated. The user is free to experiment with different EMI filter
components as desired.
Loop gain measurements (Bode plots) can be made using the setup shown in Figure 1-4.
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
Curves showing typical performance data are found in Figure 3-1and Figure 3-2. For other conditions and/or
other data, consult the device data sheet.
5.05
95
8V
13.5V
18V
24V
90
5.04
Output Voltage (V)
Efficiency (%)
85
80
75
70
8V
13.5V
18V
24V
65
5.03
5.02
5.01
60
5
0
0.5
1
1.5
2
Output Current (A)
2.5
3
0
0.5
1
1.5
2
Output Current (A)
2.5
3
Figure 3-1. Efficiency: AUTO Mode, VOUT = 5 V, fSW Figure 3-2. Line and Load Regulation: AUTO Mode,
= 2100 kHz
VOUT = 5 V, fSW = 2100 kHz
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Schematic
4 Schematic
Figure 4-1. LM63635DNEVM Schematic
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Board Layout
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5 Board Layout
CAUTION
Caution Hot surface.
Contact may cause burns.
Do not touch.
Figure 5-1. Top View of EVM
Figure 5-2. Bottom View of EVM
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Board Layout
Figure 5-3. EVM Top Copper Layer
Figure 5-4. EVM Mid Layer One
Figure 5-5. EVM Mid Layer Two
Figure 5-6. EVM Bottom Copper Layer
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Bill of Materials
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6 Bill of Materials
Table 6-1. BOM for LM63625DNEVM
DESIGNATOR
10
COMMENT
DESCRIPTION
C1
CB
CAP, CERM, 0.22 µF, 16 V,+/- 10%, X7R, AEC-Q200
Grade 1, 0603
C2,C3
CO1,CO2
CAP, CERM, 22 uF, 25 V, +/- 20%, X7R, 1210
C6
CVCC
CAP, CERM, 1 µF, 16 V,+/- 10%, X7R, AEC-Q200
Grade 1, 0603
C7,C14
CINHF,COUTHF
C8,C9,C13
MANUFACTURER
PART NUMBER
QUANTITY
Samsung
CL10B224KO8VPNC
1
Taiyo Yuden
TMK325B7226MM-TR
2
Taiyo Yuden
EMK107B7105KAHT
1
CAP, CERM, 0.22 uF, 50 V, +/- 10%, X7R, AEC-Q200
Grade 1, 0603
TDK
CGA3E3X7R1H224K080AB
2
CIN1,CIN2,CF2
CAP, CERM, 4.7 µF, 50 V,+/- 10%, X7R, AEC-Q200
Grade 1, 1206
TDK
CGA5L3X7R1H475K160AE
3
C10
CBLK
CAP, AL, 47 uF, 63 V, +/- 20%, AEC-Q200 Grade 2,
SMD
Panasonic
EEE-HA1J470UP
1
C11,C12
CF1,CF3
CAP, CERM, 1 µF, 50 V,+/- 10%, X7R, AEC-Q200
Grade 1, 1206
Taiyo Yuden
UMK316B7105KLHT
2
J1, J2
EN, SYNC/MODE
Header, 100mil, 3x1, Gold, TH
Samtec
HTSW-103-07-G-S
2
J3, J4,J5
VOUT, VIN, GND
Standard Banana Jack, Uninsulated, 8.9mm
Keystone
575-8
3
L1
L1
Inductor, Shielded, Composite, 2.2 uH, 6.1 A, 0.0201
ohm, AEC-Q200 Grade 1, SMD
Coilcraft
XEL4030-222MEB
1
L2
Lf2
Inductor, Shielded, Metal Composite, 4.7 uH, 2.9 A,
0.076 ohm, SMD
Wurth Elektronik
74438356047
1
L3
Lf1
Ferrite Bead, 600 Ω at 100 MHz, 3 A, 1210
Taiyo Yuden
FBMH3225HM601NT
1
L4
L4
Coupled inductor, 0.015 Ω, AEC-Q200 Grade 1, SMD
TDK
ACM70V-701-2PL-TL00
0
R1
RINJ
RES, 49.9, 1%, 0.1 W, AEC-Q200 Grade 0, 0603
Vishay-Dale
CRCW060349R9FKEA
1
R2,R4
RFBT,RPU
RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603
Vishay-Dale
CRCW0603100KFKEA
2
R3
RFBB
RES, 24.9 k, 1%, 0.1 W, 0603
Yageo
RC0603FR-0724K9L
1
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10,TP11,TP12
VINS, VOUTS, VIN_EMI,
EN, VOUT, GND,
TPGND2, TPGND1,
GNDS, RESET, SYNC
Terminal, Turret, TH, Double
Keystone
1593-2
12
SH-J1, SH-J2
EN, SYNC/MODE
Shunt, 100mil, Gold plated, Black
Samtec
SNT-100-BK-G
2
U1
LM63635CAQDRRRDN
3.5-V to 36-V, Automotive Step-down Voltage
Converter
Texas Instruments
LM63635CAQDRRRDN
1
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