Texas Instruments LM5064EVK Manuale utente

SNVA481B–October 2011–Revised January 2020

AN-2143 LM5064 Evaluation Kit

User's Guide

SNVA481B–October 2011–Revised January 2020

AN-2143 LM5064 Evaluation Kit

1 Introduction

The LM5064EVK evaluation module provides the power design engineer with a fully functional intelligent

monitoring and protection controller board designed for negative voltage systems. This application note

describes the various functions of the board, how to test and evaluate it, and how to use the GUI design

tool to change the components for a specific application. Use of the advanced telemetry and monitoring

capabilities of this device requires the installation of the Intelligent Power Manager GUI; however, the

LM5064 is capable of acting as a hot-swap and protection circuit without any software installation. Please

check the LM5064 Negative Voltage System Pwr Mgmt & Protection IC with PMBus (SNVS718) for the

latest software and data sheet information.

2 PCB Features

• Operating input voltage range: –36 V to –60 V

• Programmable current limit: set to 16.7 A (CL = VEE or HIGH-Z) or 8.7 A (CL = VDD)

• Q1 power limit: 80W (typical)

• UVLO thresholds: –36 V (falling) and –32 V (rising)

• OVLO thresholds: –60 V (falling) and –56 V (rising)

• Insertion delay: 125 ms

• Fault time-out period: 8 ms

• Restart time: 1.4 s

• Digital isolation circuitry for all PMBusTM signals and PGOOD

UVLO/EN

SCL

PWR

VEE_K

TIMER

PGD

GATE

SDAO

SMBA

ADR0

ADR1

ADR2

VAUX

VDD

OVLO

DIODE

SDAI

VCC

OUT

RETRY

VEE

SENSE

SENSE_ K

VAUXH

VEE_OUT (-)

LM5064

200 kŸ

16.9 kŸ

0.15 µF 1 µF 30.1 kŸ0.003

FDB047N10

GND2 (+)

100 µF

60V

5.0SMDJ60A

CMPT3904

191 kŸ

8.25 kŸ

CT CVDD RPWR

VREF

CREF

1 µF

CO1 CO2

100 µF

280 kŸ

10.0 kŸ

B3100-13-F

GND1 (+)

VEE (-)

DTEMP Q1

VAUX

Simplified Schematic

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3 Simplified Schematic

Figure 1. Simplified Schematic

UVLO/EN

SCL

PWR

VEE_K

TIMER

PGD

GATE

SDAO

SMBA

ADR0

ADR1

ADR2

VAUX

VDD

OVLO

DIODE

SDAI

VCC

OUT

RETRY

VEE

SENSE

SENSE_ K

VAUXH

VEE_OUT (-)

LM5064

200 kŸ

16.9 kŸ

0.15 µF 1 µF 30.1 kŸ0.003

FDB047N10

GND2 (+)

100 µF

10 nF

60V

5.0SMDJ60A

CMPT3904

191 kŸ

8.25 kŸ

SCL_ISO

SDA_ISO

SMBA_ISO

PGD

SWITCHES

CONNECTORS

ADR2 ADR1 ADR0 CL RETRY

VDD

HIGH-Z

OVLO

TIMER VDD

CT CVDD RPWR

VREF

CREF

1 µF

RS- RS+

CO1 CO2

100 µF

VAUXH

PGD

VEE

OPEN

R2a

280 kŸ

10.0 kŸ

10 kŸ

RP1

ASCL

ASDA

AGND

AVDD

BSCL

BSDA

BGND

BVDD VEE

VDD

1 µF 10 kŸ

RP2

VEE

SDAI/

SDAO

SCL

DGND

DVDD

1 µF

DGND

SDA_ISO

SCL_ISO

Si4800

PS2501-1-A

DGND

RP4

DVDD

39.0 kŸ

ISOLATION

DGND

VEE

RP5

DVDD

39.0 kŸ

PGOOD_ISO

SMBA_ISO

RP6

VDD

10.0 kŸ

RP3

VDD

4.99 kŸ

DVDD

SCL_ISO

SDA_ISO

SMBA_ISO

DGND

DVDD

0Ÿ

RS2

OPEN

B3100-13-F

DRAIN VEE_OUT_S

GND2_S

GND1 (+)

GND1_S

VEE (-)

VEE_S

UVLO/

0Ÿ

0ŸPGD

VEE

PGOOD

SMBA

GATE

CAXH

OPEN

0Ÿ

RAXH

DTEMP

0Ÿ

RIN

CIN

RS1

VAUX

1000 pF

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Getting Started

SNVA481B–October 2011–Revised January 2020

AN-2143 LM5064 Evaluation Kit

Figure 2. Full Evaluation Board Schematic

The schematic for the LM5064 evaluation board is shown in Figure 2. Connections to the PMBus interface

are provided by J2. Banana connectors provide input and output connections. Pins ADR0, ADR1, and

ADR2 are connected to switches that set the PMBus address of the device to one of 27 unique

addresses. Pins RETRY and CL are also connected to switches, allowing for hardware programmability of

the retry and current limit parameters, respectively. Test points are provided to conveniently probe signals

of interest.

4 Getting Started

The LM5064 evaluation kit hardware is shown in Figure 3.

Hardware Setup Steps

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The LM5064EVK is supplied with the PMBus address set to 0x16 as dictated by the switch configuration

of the ADR0, ADR1, and ADR2 jumper connections.

Figure 3. Connection Illustration

The first step to evaluate the telemetry features of LM5064 is to install the GUI software. The software is

included on a CD in the evaluation kit and is titled PMBManager-x.x.x-xxxxxxxx.exe, where the x

characters indicate the software version and build date. This file should be executed on a PC running

Windows XP or later to install the software. Once the GUI software is installed the hardware should be

configured as shown in Figure 3.

5 Hardware Setup Steps

1. Connect the input supply to the GND1 (+) and VEE (-) banana plugs.

2. Connect the load to the GND2 (+) and VEE_OUT (-) banana plugs.

3. Connect the FTDI dongle to the 10 pin connector (J2) on the left side of the board.

4. Connect the supplied mini USB cable from the FTDI dongle to an USB port on a PC.

When the FTDI dongle is connected for the first time the user will be prompted to install the device drivers.

For the most current driver installation procedure refer to the README.TXT file in the installation

directory.

For a hot swap circuit to function reliably, a low inductance connection to the input supply is

recommended. Its purpose is to minimize voltage transients which occur when the load current changes or

is shut off. If not careful, wiring inductance in the supply lines will generate a voltage transient at the input

which can exceed the absolute maximum rating of the LM5064, resulting in its destruction. To protect

against such voltage transients, TVS device Z1 is provided to clamp the voltage at the input to within safe

operating limits. Likewise, Schottky diode D1 is provided on the output to clamp the output from going

excessively positive during short circuit events.

6 Device Evaluation

After configuring the hardware connections, apply an input voltage of -48V to the device. The current

hardware configuration allows the LM5064 device to work from -36V to -60V input supply voltage;

however, this guide will assume an input voltage of -48V. Launch the GUI by going to the Windows Start

menu -> All Programs -> PMBManager-x.xxxxx -> PMBusManager. A pulldown menu should come up

with a list of devices populated. Select the "LM5064" option as shown in Figure 4.

Figure 4. Device Selector

Device Information

Device Configuration

Telemetry Plotter

Device Telemetry

Display Options Design Tool

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Device Evaluation

SNVA481B–October 2011–Revised January 2020

AN-2143 LM5064 Evaluation Kit

The device should be detected on the PMBusand the initial load screen should appear as shown in

Figure 5.

Figure 5. Initial GUI Screen

If a device is not detected, an option is provided to rescan, ignore, or exit the GUI. If the hardware is

intended to be connected, check the USB connection to the PCB, FTDI connection to the evaluation

module, and verify that the power is present on the evaluation PCB by measuring the voltage between the

GND1_s (+) and VEE_s (-) testpoints. Ignoring the detection message allows use of the integrated design

tool without the hardware connected.

Figure 6. LM5064 Block Level Representation

Double click on the detected device ID (NSC-LM5064-AA) to display a block level representation of the

device as shown in Figure 6. The block level view of the device provides a display of all the telemetry data

as well as most of the faults and warnings supported by the device. The faults and warnings supported

are generally associated with an invalid input or output condition.

Device Evaluation

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The faults shown on the left side of the block representation are generally associated with the input. These

include input under-voltage (UV), input over-voltage (OV), FET Fail (FF), and input over-power (OP). The

SMBus alert status, SMBA, is also shown on the left side and will turn red during any warning or fault

event. To facilitate the evaluation of the device, SMBus alerts are automatically cleared by the GUI.

The faults shown on the right side of the block representation are associated with the output. These

include output over-voltage (OV), power good status (PGD), output over-current (OC), and over-

temperature (OT). There is also an indicator if the output is in the latched off state (LO). The device will

latch the output off after the number of user programmable retries is exceeded. To clear the latched off

condition, the output can be toggled off and on by the red power button icon located in the top right of the

LM5064 block representation.

To show a repetitive update of the device telemetry and status click on the play icon at the top of the

screen. The play button starts an active telemetry log of the gathered data. Clicking the stop icon stops

the telemetry collection and allows for the log file to be viewed and saved. The pause button pauses both

the displaying and logging of telemetry information.

To disable displaying undesired telemetry click the display icon on the block representation. This will open

the window shown in Figure 7 that will allow the user to disable the undesired telemetry, fault, and warning

information from appearing on the block level device representation.

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GUI Event Log

SNVA481B–October 2011–Revised January 2020

AN-2143 LM5064 Evaluation Kit

Figure 7. LM5064 Telemetry Display Options

Note that turning off the various warning options does not mask the faults from issuing an SMBus alert - it

just does not display them if they occur. The device is capable of masking various faults and this

functionality can be setup in the device configuration panel.

7 GUI Event Log

A GUI event log is provided to keep track of GUI configuration changes and device fault events. To

display the event log select View from the main menu bar and then View Event Log. The event log will

appear on the left side of the main GUI window. The event log can be detached and expanded if desired

by left clicking on the event log window and dragging window with the mouse to the desired location.

Plotting Telemetry Data

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8 Plotting Telemetry Data

To enable telemetry data plots click on the sine wave icon located on the LM5064 block representation.

After enabling the telemetry, a prompt will appear requesting entry of the GUI sample rate, plot rate, and

plot depth. For most cases the default rates and depths will be acceptable. The plotting tool allows the

user to select the desired data to be plotted. Up to two different parameters may be plotted at the same

time as shown in Figure 8 .

Figure 8. LM5064 GUI with Telemetry Plotting Tool Enabled

Device telemetry data is plotted as a black line that continually updates as the device is queried. In

addition to the device data, the relevant warning and fault thresholds are also plotted. Warning thresholds

are shown as orange lines while fault thresholds are shown in red and blue.

By going to the plot menu option the user can disable the plotting grid as well as the warning and fault

lines.

9 Configuring the LM5064 Device

Warning Thresholds, Temperature Fault Threshold, Protection Ranges, Fault Masking, and Averaging can

be configured in the Device Configuration panel. This panel, shown in Figure 9, is enabled by clicking the

gear icon shown on the LM5064 block representation.

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Configuring the LM5064 Device

SNVA481B–October 2011–Revised January 2020

AN-2143 LM5064 Evaluation Kit

Figure 9. Device Configuration Panel

Customizing the Design

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The Warning and Fault Threshold tab allows configuration of the input under-voltage, input over-voltage,

output under-voltage, input over-current, input power, and over temperature warnings. This tab also allows

adjustment of the over-temperature fault threshold. Fault threshold for the input over- and under-voltage,

current limit, power limit, and power good are set by the hardware design. Decimal values for the

thresholds are shown in the text box located to the right of the slider bar. Above the decimal values setting

is the value of the setting in hexadecimal, which can be useful when developing software for this device.

The fault behavior tab allows the user to set the device fault configuration and fault masking. The fault

configuration section allows the user to set the number of retries, as well as the circuit breaker and current

limit thresholds. The number of retries can be set by the RETRY pin to be infinite or latched off. Through

software, the number of retries can be set to 0 (latch-off), 1, 2, 4, 8, 16 or infinite. The software settings

are independent of the hardware settings; however, if the power is cycled the device will default to values

dictated by the hardware. Current limit power-up values are also set by the hardware. The values for

current limit can be set to either 26 mV (CL = VDD) or 50 mV (CL = VEE). The circuit breaker threshold

can also be set in software to either 1.9 times or 3.9 times the current limit value. Fault masking is

possible for many of the device fault conditions. Fault conditions allow masking of both the MOSFET

response and the SMBus alert signal. Note that if a fault occurs repeatedly while the MOSFET is masked,

damage to the MOSFET may result. This feature is allowed primarily for debug purposes. Faults that do

not shut off the MOSFET, and only issue a SMBus alert, will also allow masking of the alert. Note the

power-up default setting for the power good signal is to mask the SMBus alert, in order to ensure that

SMBus alert is not asserted immediately after power-up.

For convenience, the Device Configuration Panel can be undocked by holding down the left mouse button

while the cursor is at the top of the panel and dragging it to where you would like it to be placed.

10 Customizing the Design

The GUI assumes the hardware configuration is set to default evaluation board configuration. If any of the

components are changed, the device hardware configuration needs to be updated in the design tool

section. To open the design tool click the wrench icon located on the LM5064 block representation which

will open the window displayed in Figure 10.

Figure 10. LM5064 Design Tool

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