Texas Instruments MLTLDO2EVM-037 User manual

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MLTLDO2EVM-037 Evaluation Module
User's Guide
SBVU065–May 2020
MLTLDO2EVM-037 Evaluation Module
This user’s guide describes the operational use of the MLTLDO2EVM-037 evaluation module (EVM) as a
reference design for engineering demonstration and evaluation of linear regulators. The EVM is
specifically designed for linear regulators which are packaged in the DDA, DCY, 3-pin KVU and 5-pin KVU
packages. Included in this user’s guide are setup and operating instructions, thermal and layout
guidelines, a printed circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM).

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Contents
1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines ...................... 3
2 Introduction ................................................................................................................... 4
3 PCB Layout ................................................................................................................. 13
4 Schematic ................................................................................................................... 16
5 Bill of Materials ............................................................................................................. 20
List of Figures
1 Assembly Layer ............................................................................................................ 13
2 Top Layer Routing ......................................................................................................... 13
3 First Middle Layer .......................................................................................................... 14
4 Second Middle Layer ...................................................................................................... 14
5 Bottom Layer Routing ..................................................................................................... 15
6 Generic DCY Package Schematic....................................................................................... 16
7 Generic DDA Package Schematic....................................................................................... 17
8 Generic 3-pin KVU Package Schematic ................................................................................ 18
9 Generic 5-pin KVU Package Schematic ................................................................................ 19
List of Tables
1 MLTLDO2EVM-037 BOM ................................................................................................ 20
Trademarks
All trademarks are the property of their respective owners.

WARNING
www.ti.com General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
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1 General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
Always follow TI’s setup and application instructions, including use of all interface components within their
recommended electrical rated voltage and power limits. Always use electrical safety precautions to help
ensure your personal safety and those working around you. Contact TI's Product Information Center
http://support/ti./com for further information.
Save all warnings and instructions for future reference.
WARNING
Failure to follow warnings and instructions may result in personal injury,
property damage or death due to electrical shock and burn hazards.
The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed
printed circuit board assembly. It is intended strictly for use in development laboratory environments,
solely for qualified professional users having training, expertise and knowledge of electrical safety risks in
development and application of high voltage electrical circuits. Any other use and/or application are strictly
prohibited by Texas Instruments. If you are not suitable qualified, you should immediately stop from further
use of the HV EVM.
1. Work Area Safety
a. Keep work area clean and orderly.
b. Qualified observer(s) must be present anytime circuits are energized.
c. Effective barriers and signage must be present in the area where the TI HV EVM and its interface
electronics are energized, indicating operation of accessible high voltages may be present, for the
purpose of protecting inadvertent access.
d. All interface circuits, power supplies, evaluation modules, instruments, meters, scopes and other
related apparatus used in a development environment exceeding 50Vrms/75VDC must be
electrically located within a protected Emergency Power Off EPO protected power strip.
e. Use stable and nonconductive work surface.
f. Use adequately insulated clamps and wires to attach measurement probes and instruments. No
freehand testing whenever possible.
2. Electrical Safety
As a precautionary measure, it is always a good engineering practice to assume that the entire EVM
may have fully accessible and active high voltages.
a. De-energize the TI HV EVM and all its inputs, outputs and electrical loads before performing any
electrical or other diagnostic measurements. Revalidate that TI HV EVM power has been safely
de-energized.
b. With the EVM confirmed de-energized, proceed with required electrical circuit configurations,
wiring, measurement equipment connection, and other application needs, while still assuming the
EVM circuit and measuring instruments are electrically live.
c. After EVM readiness is complete, energize the EVM as intended.
WARNING
While the EVM is energized, never touch the EVM or its electrical
circuits, as they could be at high voltages capable of causing electrical
shock hazard.

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3. Personal Safety
a. Wear personal protective equipment (for example, latex gloves or safety glasses with side shields)
or protect EVM in an adequate lucent plastic box with interlocks to protect from accidental touch.
Limitation for safe use:
EVMs are not to be used as all or part of a production unit.
2 Introduction
TI's MLTLDO2EVM-037 helps design engineers evaluate the operation and performance of linear
regulators for possible use in their own circuit application. The MLTLDO2EVM-037 EVM offers four linear
regulator designs, each one electrically isolated from the other through tab routing in the PCB fabrication
step. The boards can be quickly separated through the breakaway tabs if desired. Combined, the boards
can mount many linear regulators which come in the DDA, DCY, 3-pin KVU and 5-pin KVU packages. The
boards that carry the DDA, DCY and 3-pin KVU packages have been designed to withstand up to 100 Vdc
of voltage across its input and output terminals. The board carrying the 5-pin KVU package has been
designed to withstand up to 50 Vdc of voltage across its input and output terminals. All four boards have
been designed to withstand 5 Adc of current draw. This allows the EVM to be used for numerous linear
regulator designs in TI's portfolio, as well as future designs that may operate into high voltage or high
current. Each board is designed to populate multiple input and output capacitors, allowing the user to
customize the EVM for their specific needs. User-selectable grounding is available on each board,
allowing the user to evaluate the linear regulator in a floating application. Thermal vias have been placed
near each linear regulator to aid in thermal spreading of the heat generated by the device. The EVM
comes with four bumpons to lift the EVM off of the test surface, and mounting holes are provided for
standoffs or mounting to an external chassis. Additional features provided for each design are covered in
this User's Guide.
2.1 Before You Begin
The following warnings and cautions are noted for the safety of anyone using or working close to the
MLTLDO2EVM-037. Observe all safety precautions.
WARNING
Danger: HIGH VOLTAGE! This evaluation board is intended for
professional use only. This board has exposed high voltages. Do
not operate this board without proper high-voltage and high-
current safety practices. Read this user guide carefully before
testing with the MLTLDO2EVM-037. Use floating measurement
equipment such as high-voltage differential scope probes.
WARNING
Hot surface. Contact may cause burns. Do not touch.
CAUTION
The circuit module can be damaged by overtemperature. To avoid damage,
monitor the temperature during evaluation and provide cooling, as needed, for
your system environment.

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CAUTION
Some power supplies can be damaged by application of external voltages. If
you are using more than one power supply, check your equipment
requirements and use blocking diodes or other isolation techniques, as needed,
to prevent damage to your equipment.
CAUTION
Do not leave EVM powered when unattended.
CAUTION
The circuit module is not a finished product or electrical appliance. The module
does not contain current or voltage thresholds for circuit protection. It must be
used by qualified personnel with additional equipment for evaluation only.

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2.2 MLTLDO2EVM-037 Design Details
2.2.1 Connector Ratings
Each board within the MLTLDO2EVM-037 comes with two sets of input and output connectors. The
banana connectors are rated for 60 Vdc maximum applied voltage, however banana cables are typically
rated for low voltage only. The user should review the voltage rating of the banana cables prior to applying
power to the EVM. If the banana cables are not rated for the voltage being applied to the EVM, the
terminal blocks must be used instead. For the purposes of this user guide, it is assumed that the banana
cables are rated up to 50 Vdc. For operation above 50 Vdc, the terminal blocks must be used. Either set
of connectors may be used for the current draw of the EVM when the load current is less than or equal to
5 Adc.
2.2.2 EVM Operation Up To 50 Vdc (KVU|5 Package) or 100 Vdc (DCY, DDA, and KVU|3 Packages)
The IPC-2221 standard was used during the design of the MLTLDO2EVM-037 to set the conductor
spacing between low-voltage nets and high-voltage nets. Specifically, column A6 of Table 6-1 was used
during the design of the EVM. The boards carrying the DCY, DDA, and 3-pin KVU packages were
designed with 100 Vdc spacing in accordance with the IPC-2221 standard, Table 6-1, column A6. The
board carrying the 5-pin KVU package was also designed with 100 Vdc spacing in accordance with the
IPC-2221 standard, Table 6-1, column A6; however the 5-pin KVU package pin spacing is too narrow to
meet 100 Vdc clearance. This board is therefore rated up to 50 Vdc in accordance with the IPC-2221
standard.
2.2.3 The Importance of a Clean PCB
Prior to connecting power to any circuit board, it is always important to ensure the PCB is free from
contaminants. These contaminants can come in the form of flux residue, oils deposited from handling the
PCB, dirt, or other sources of foreign object debris (FOD). Contaminants affect the electrical
characteristics of the PCB by lowering the isolation impedance between traces. Furthermore, they can
introduce additional leakage paths into the system. If the PCB is to be used at high voltage, it is critical
that the board is clean from contaminants, as arcing through the contaminants may occur. The
MLTLDO2EVM-037 is shipped from the factory clean from contaminants. If you believe the board may
have contaminants, please consult your organization's procedures on testing for contaminants or refer to
IPC-TM-650. Common methods of cleaning a PCB include a DI bath or use of a specially made PCB
cleaning product readily available through distributors. To clean the PCB, consult the processes in your
organization for the right cleaning process for your hardware. Alternatively, refer to IPC-CH-65B which
offers guidelines on cleaning printed-circuit boards and assemblies.
2.2.4 EVM System Grounding
Each board within the MLTLDO2EVM-037 is electrically isolated from the other three boards in the EVM.
External mounting holes are provided to mount the EVM to the system chassis. An 0805-sized surface
pad is placed near each mounting hole. If populated, the components will tie the mounting hole to the
internal board ground plane. The user may short these pads if the chassis should be tied directly to
ground. If the EVM will be floating, it is recommended that the user capacitively couple the EVM to the
chassis using an 0805-sized capacitor.
2.3 EVM Mounting Hole Locations
Each of the four boards within the MLTLDO2EVM-037 has mounting holes for standoffs or placement into
a chassis. The mounting hole locations on an individual board are separated in width by 1.71 inches and
length by 3.315 inches. The MLTLDO2EVM-037 mounting hole locations are separated in width by 8.925
inches and length by 3.315 inches.

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2.4 Using the MLTLDO2EVM-037 PCB Beyond Its Design Ratings
2.4.1 EVM Operation Beyond 5 Adc
The MLTLDO2EVM-037 PCB was designed to withstand current loading up to 5 Adc from VIN to VOUT,
and back through the ground plane, of each board. If larger load currents are used, the user should review
the connector data sheets to confirm they can withstand the load current. By design the current density
will be the largest at the package pins of each linear regulator. As such, the linear regulator package pins
will experience elevated heat and current density when the load current is above 5 Adc.
2.4.2 EVM Operation Beyond 50 Vdc (KVU|5 Package) or 100 Vdc (DCY, DDA, and KVU|3 Packages)
If the end use of the MLTLDO2EVM-037 PCB will require larger voltages than it was designed for, it may
still be possible to use it if the proper precautions are taken. A common method to extending the voltage
rating of a PCB is to apply conformal coating. Conformal coatings are readily available through most
distributors.

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2.5 Inputs/Outputs Connectors and Jumper Descriptions
2.5.1 J1 – INPUT_DCY_BANANA
Input voltage for the DCY package. Use this connection for voltages at 50 Vdc or less.
2.5.2 J2 – OUTPUT_DCY_BANANA
Regulated output power supply voltage for the DCY package. Use this connection for voltages at 50 Vdc
or less.
2.5.3 J3 – INPUT_DCY_TERMINAL
Input voltage terminal block for the DCY package.
2.5.4 J4 – DCY_IN_S
Input voltage sense for the DCY package.
2.5.5 J5 –DCY_OUT_S
Output voltage sense for the DCY package.
2.5.6 J6 – OUTPUT_DCY_TERMINAL
Output voltage terminal block for the DCY package.
2.5.7 J7 – DCY_FB
DCY package feedback pin header.
2.5.8 J8 – GND_DCY_BANANA_IN
Input supply ground for the DCY package. Use this connection for voltages at 50 Vdc or less.
2.5.9 J9 – GND_DCY_BANANA_OUT
Regulated output supply ground for the DCY package. Use this connection for voltages at 50 Vdc or less.
2.5.10 J10 – DCY PACKAGE TEST HOOKUP
Intended for test purposes only.
2.5.11 J11 – INPUT_DDA_BANANA
Input voltage for the DDA package. Use this connection for voltages at 50 Vdc or less.
2.5.12 J12 – OUTPUT_DDA_BANANA
Regulated output power supply voltage for the DDA package. Use this connection for voltages at 50 Vdc
or less.
2.5.13 J13 – DDA_EN
DDA package EN pin header. Connect the jumper from pin 1 to pin 2 of the header to enable the DDA
package linear regulator.
2.5.14 J14 – INPUT_DDA_TERMINAL
Input voltage terminal block for the DDA package.

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2.5.15 J15 – DDA_IN_S
Input voltage sense for the DDA package.
2.5.16 J16 –DDA_OUT_S
Output voltage sense for the DDA package.
2.5.17 J17 – OUTPUT_DDA_TERMINAL
Output voltage terminal block for the DDA package.
2.5.18 J18 – GND_DDA_BANANA_IN
Input supply ground for the DDA package. Use this connection for voltages at 50 Vdc or less.
2.5.19 J19 – GND_DDA_BANANA_OUT
Regulated output supply ground for the DDA package. Use this connection for voltages at 50 Vdc or less.
2.5.20 J20 – DDA PACKAGE TEST HOOKUP
Intended for test purposes only.
2.5.21 J21 – INPUT_KVU3_BANANA
Input voltage for the KVU 3-pin package. Use this connection for voltages at 50 Vdc or less.
2.5.22 J22 – OUTPUT_KVU3_BANANA
Regulated output power supply voltage for the KVU 3-pin package. Use this connection for voltages at 50
Vdc or less.
2.5.23 J23 – KVU3_IN_S
Input voltage sense for the KVU 3-pin package.
2.5.24 J24 –KVU3_OUT_S
Output voltage sense for the KVU 3-pin package.
2.5.25 J25 – INPUT_KVU3_TERMINAL
Input voltage terminal block for the KVU 3-pin package.
2.5.26 J26 – OUTPUT_KVU3_TERMINAL
Output voltage terminal block for the KVU 3-pin package.
2.5.27 J27 – GND_KVU3_BANANA_IN
Input supply ground for the KVU 3-pin package. Use this connection for voltages at 50 Vdc or less.
2.5.28 J28 – GND_KVU3_BANANA_OUT
Regulated output supply ground for the KVU 3-pin package. Use this connection for voltages at 50 Vdc or
less.
2.5.29 J29 – KVU3 PACKAGE TEST HOOKUP
Intended for test purposes only.

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2.5.30 J30 – INPUT_KVU5_BANANA
Input voltage for the KVU 5-pin package. Use this connection for voltages at 50 Vdc or less.
2.5.31 J31 – OUTPUT_KVU5_BANANA
Regulated output power supply voltage for the KVU 5-pin package. Use this connection for voltages at 50
Vdc or less.
2.5.32 J32 – KVU5_EN
KVU 5-pin package EN pin header. Connect the jumper from pin 1 to pin 2 of the header to enable the
KVU 5-pin package linear regulator.
2.5.33 J33 – INPUT_KVU5_TERMINAL
Input voltage terminal block for the KVU 5-pin package.
2.5.34 J34 – KVU5_IN_S
Input voltage sense for the KVU 5-pin package.
2.5.35 J35 –KVU5_OUT_S
Output voltage sense for the KVU 5-pin package.
2.5.36 J36 – OUTPUT_KVU5_TERMINAL
Output voltage terminal block for the KVU 5-pin package.
2.5.37 J37 – GND_KVU5_BANANA_IN
Input supply ground for the KVU 5-pin package. Use this connection for voltages at 50 Vdc or less.
2.5.38 J38 – GND_KVU5_BANANA_OUT
Regulated output supply ground for the KVU 5-pin package. Use this connection for voltages at 50 Vdc or
less.
2.5.39 J39 – KVU5 PACKAGE TEST HOOKUP
Intended for test purposes only.
2.5.40 TP1 – DCY_OUTPUT
DCY regulated output voltage test point.
2.5.41 TP2 – DCY_INPUT
DCY input voltage test point.
2.5.42 TP3 – DCY_BODE_TOP
DCY top bode resistor test point.
2.5.43 TP4 – DCY_BODE_BOTTOM
DCY bottom bode resistor test point.
2.5.44 TP5 – DCY_INPUT_GND
DCY input ground test point.