Texas Instruments LM25066EVK Manuale utente

User's Guide

SNVA464C–December 2010–Revised April 2013

AN-2100 LM25066 Evaluation Board

1 Introduction

The LM25066EVK evaluation kit provides the design engineer with a fully functional, intelligent monitoring

and hot-swap protection board designed for positive voltage systems. This application note describes the

various functions of the evaluation board, how to test and evaluate it, and how to use the companion GUI.

The GUI is used to collect telemetry, configure warning and fault thresholds, and assist the designer with

selection of the external components for a specific application. Use of the advanced telemetry and

monitoring capabilities of the LM25066 requires external control via the Power Management Bus (PMBus)

interface. However, the LM25066 is capable of acting as a hot-swap and protection circuit without any

PMBus intervention. Please check the LM25066 System Power Management & Protection IC with PMBus

(SNVS654) data sheet for the latest software and data sheet information.

2 PCB Features

• Input voltage range: 2.9V to 16V (limited by input clamp D1)

• Programmable current limit: set to 50A (±8%)

• Q1 power limit: 80W (typical)

• UVLO thresholds: 2.9V and 3.1V

• PGD thresholds: 10.8V and 10.25V

• Insertion delay: 147 ms (typical)

• Fault time-out period: 8.9 ms

• Restart time: 1.1 seconds

• PCB size: 3.5” x 4.2”

• Solution size: 0.7” x 0.7”

Panduit is a registered trademark of Panduit Corp.

All other trademarks are the property of their respective owners.

SNVA464C–December 2010–Revised April 2013 AN-2100 LM25066 Evaluation Board

UVLO/EN

PGD

VREF PWR

GND

CREF RPWR

18 10

VIN SENSE GATE OUT

PSMN1R2-25YL

CIN

1 PF

D1 RS1

15 14 13 12

0.5 m:

0.1 PF

25V

330 PF

25V

10k

LM25066

6.98k

1 PF

15V

RFB1

22.6k

FB RFB2

2.74k

6.81k

RS+ RS-

49.9k

4.12k

OVLO

TIMER

0.47 PF

ADR0

ADR1

ADR2

CVDD

4.7 PF

VDD

ADR0

ADR1

ADR2

150k

RPG

10k

VAUX

SDA

SCL

SMBA

SDA

SCL

SMBA

RETRY

CLIM

RETRY

DIODE

1 nF R6

10k

VAUX

1 nF

VDD

GND

VIN VOUT

GND

VDD

ADR0

VDD

ADR1

VDD

ADR2

CMPT3904

(Near Q1)

VDD CB

VDD CLIM

CLIM

VDD

RETRY

JUMPERS

PGOOD

PGD

1 2

SCL 4

5 6

7 8

9 10

SDA

SMBA PGOOD

GND

J1 1 2

SCL 4

5 6

7 8

9 10

SDA

SMBA

GND

PMBusTM Connectors

330 PF

25V

RETRY

Simplified Schematic

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3 Simplified Schematic

Figure 1. Simplified Evaluation Board Schematic

The simplified schematic for the LM25066 evaluation board is shown in Figure 1. Connections to the

PMBus interface are provided by connector J1. Panduit®terminal lugs bolt down to the PCB to provide

input and output connections. Jumpers ADR0, ADR1, and ADR2 set the PMBus slave address of the

LM25066 to one of 27 unique addresses. Jumpers also exist to set the retry, circuit breaker, and current

limit behavior. Test points are provided for VIN, VOUT, GATE, UVLO, VAUX, PGD, VREF, TIMER and

GND.

4 Getting Started

The LM25066 evaluation kit hardware is shown in Figure 2. The board offers two connection methods for

the system input voltage and load. For evaluation at currents below 15A, the system voltage and load can

be plugged directly into the female banana receptacles. For higher currents, it is recommended to use the

copper Panduit lugs with low gauge wire to minimize the cable power dissipation and voltage drop.

Capacitors C5 and C6 represent capacitance which is typically present at the input of the load circuit and

are present on this evaluation board so that the turn-on characteristics of the LM25066 may be tested

starting into a capacitive load. Footprints for components RS2 and Q2 are not populated and are provided

to accommodate evaluation of hot-swap designs with current levels greater than 50A.

The LM25066EVK is supplied with the PMBus slave address set to 0x16 as dictated by the configuration

of the ADR0, ADR1, and ADR2 jumper connections.

2AN-2100 LM25066 Evaluation Board SNVA464C–December 2010–Revised April 2013

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Hardware Setup Steps

Figure 2. Connection Illustration

The first step to evaluate the telemetry features of the LM25066 is to install the GUI application. The

application distribution 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. To install the

application, this file should be executed on a PC running Windows XP or later. Once the application is

installed, the hardware should be connected as shown in Figure 2.

5 Hardware Setup Steps

1. Connect the input supply to either the VIN and GND banana plugs (IOUT<15A) or to the input terminal

lugs (IOUT>15A).

2. Connect the load to either the VOUT and GND banana plugs (IOUT<15A) or to the output terminal

lugs (IOUT>15A).

3. Connect the FTDI Dongle to the 10-pin connector on the left side of the board.

4. Connect the supplied mini USB cable from the FTDI dongle to a 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 recent driver installation procedure, please 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. High parasitic inductance in the supply lines coupled with the rapid change of current when the

FET turns off will induce a voltage spike. This spike can exceed the absolute maximum voltage rating of

the LM25066, resulting in its destruction. To protect against such voltage spikes, TVS diode D1 is

provided to clamp the input voltage to within safe operating limits. Likewise, Schottky diode D2 is provided

at the output to clamp the output voltage from going too negative during short circuit events.

6 GUI Evaluation

After the hardware connections have been made, apply an input voltage of 12V. The current hardware

configuration allows the LM25066 to work with 3.3V, 5.0V, and 12V system rails. However, this Quick

Start guide will assume an input voltage of 12V. From the Windows Start menu, launch the GUI

application. The LM25066 should be detected on the PMBus and an initial screen should appear as

shown in Figure 3.

SNVA464C–December 2010–Revised April 2013 AN-2100 LM25066 Evaluation Board

GUI Evaluation

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Figure 3. Initial GUI Screen

If the LM25066 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 PC, the FTDI connection to the evaluation

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

VIN and GND testpoints. Choosing the Ignore option causes the application to bypass additional attempts

to detect the LM25066 on the PMBus and facilitates access to the GUI integrated design tool.

Single-click on the detected device ID, NSC-LM25066-AA, to display a block level representation as

shown in Figure 4. The block level view of the device provides a display of all the telemetry as well as

most of the faults and warnings supported by the LM25066. The faults and warnings supported are

generally associated with an invalid input or output condition.

Figure 4. LM25066 Block Level Representation

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

faults 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 evaluation of the LM25066, SMBus alerts are automatically cleared by the GUI while

telemetry is monitored.

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

include output under-voltage (UV), 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 LM25066 will

latch the output off after the number of programmed retries is exceeded. To clear the latched-off condition,

the output can be toggled off and then on by the red Power button located at the top right of the LM25066

block representation.

4AN-2100 LM25066 Evaluation Board SNVA464C–December 2010–Revised April 2013

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GUI Event Log

To show a continuuous update of the LM25066 telemetry and status, click on the Play button at the top of

the screen. The Play button starts an active telemetry log of the gathered data. Clicking the Stop button

stops the telemetry collection and allows the log file to be viewed and saved. The Pause button pauses

both the displaying and logging of telemetry information, but does not clear the log.

To enable/disable display of specific telemetry, click the Display Options button on the block

representation and choose the desired telemetry to display (see Figure 5).

Figure 5. LM25066 Telemetry Display Options

Note that enabling/disabling the various warning and fault options has no affect on the Fault mask.

7 GUI Event Log

A GUI Event Log is provided to keep track of GUI configuration changes and LM25066 fault events. To

display the Event Log, select View from the main menu bar and then View Event Log. The dockable

window housing the Event Log can be detached (or docked to a different region of the GUI) by dragging

its title bar to the desired location.

8 Plotting Telemetry

To enable telemetry data plots, click on the Device Telemetry (sinewave) button located in the LM25066

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 simultaneously, as shown in Figure 6.

SNVA464C–December 2010–Revised April 2013 AN-2100 LM25066 Evaluation Board

Configuring the LM25066

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Figure 6. LM25066 GUI with Telemetry Plotting Tool Enabled

Telemetry is plotted as a black line that continually updates as the LM25066 is queried. In addition to the

telemetry, 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.

From the Plot menu option in the main menu bar, the user can disable the plotting grid as well as the

warning and fault lines.

9 Configuring the LM25066

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

be configured in the Device Configuration panel. This panel, shown in Figure 7, is enabled by clicking the

Gear button shown in the LM25066 block representation.

6AN-2100 LM25066 Evaluation Board SNVA464C–December 2010–Revised April 2013

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Configuring the LM25066

Figure 7. Device Configuration Panel - Warning and Fault Thresholds Tab

The Warning and Fault Thresholds 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. Adjustments can be made by moving the slider button

with the mouse, by clicking on the slider line, or by clicking on the up/down arrows in the number box.

Fault thresholds for the input under- and over-voltage, current limit, power limit, and power good are set by

external configuration components. 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; this

can be useful when developing software/firmware to control and configure the LM25066.

The Fault Behavior tab, shown in Figure 8, allows the user to set the LM25066 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 is set by the RETRY pin at power-on-reset

(POR) to be infinite or latched-off. Subsequently, the number of retries can be set via the PMBus interface

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 LM25066 will default to the setting based on the RETRY pin. Current

limit and circuit breaker power-up settings are set by the CL and CB pins, respectively. The current limit

threshold can be set to either 25 mV (CL = GND) or 46 mV (CL = VDD). The circuit breaker threshold can

also be set to either 1.8 times (CB = GND) or 3.6 times (CB = VDD) the current limit threshold. Fault

SNVA464C–December 2010–Revised April 2013 AN-2100 LM25066 Evaluation Board

GUI Design Page

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masking is possible for many of the LM25066 fault conditions. Fault conditions allow masking of both the

MOSFET response and the SMBus alert signal. Note that if a fault persists while the MOSFET gate

masking is enabled, damage to the MOSFET may occur. This option is allowed primarily for debug

purposes. Faults that issue only a SMBus alert (FET Fail, Communications Fault) allow masking of the

alert. Note that the power-up default setting for the Power Good signal is to mask the SMBus alert.

Figure 8. Device Configuration Panel - Fault Behavior Tab

For convenience, the dockable window containing the Device Configuration tabs can be detached (or

docked to a different region of the GUI) by dragging its title bar to the desired location.

10 GUI Design Page

The GUI assumes the hardware configuration is set to the default LM25066 evaluation board

configuration. If any of the components are changed, the LM25066 hardware configuration needs to be

updated in the Design Tool section. To open the design tool, click the Wrench button located in the

LM25066 block representation which will display the window as shown in Figure 9.

8AN-2100 LM25066 Evaluation Board SNVA464C–December 2010–Revised April 2013

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GUI Design Page

Figure 9. LM25066 Design Tool

Design inputs are keyed in on the left side following steps 1 though 5. General operating conditions should

be entered in step 1 of the design tool. These inputs help set bounds on the startup time and application

voltage and current ranges.

Step 2 allows the user to tailor the MOSFET protection features specific to the target application. Both pin

and software configurable ranges are available for the circuit breaker and current limit circuits. If a pin

configuration is selected, please make sure the CB and CL jumpers are set to match the GUI selection.

Note that the state of all jumpers is sampled only at startup (POR). Thus, if any changes are made to the

jumpers, be sure to cycle power. By clicking on the MOSFET SOA Profile button, the user can select SOA

data from several popular MOSFETs or enter the SOA data for the desired MOSFET.

Step 3 allows the user to select the under- and over-voltage lockout (UVLO/OVLO) levels, and power

good (PGD) thresholds. Note that with the correct values for R1 - R4, and RFB1 and RFB2 installed, the

LM25066 will indicate a fault condition when the input and/or output voltages are outside of their

respective ranges.

Step 4 allows the user to set the fault timeout period and the fault response. The fault timeout should be

set to be below the MOSFET SOA data for a given time. For example, if a design is to adhere to the 10

ms pulsed MOSFET SOA data, the desired fault timeout must be less than 10 ms. The fault timeout time

entered will set the value for CT. It also sets the insertion delay and fault retry delay. The initial power up

retry behavior is also selected in this design step. Make sure to change the RETRY jumper to match the

design tool schematic when changing the default retry setting.

SNVA464C–December 2010–Revised April 2013 AN-2100 LM25066 Evaluation Board

GUI Register Page

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In Step 5, the user enters the desired PMBus slave address. Note that changing the PMBus slave address

in this step does not change the physical address, but shows how the address pins of the LM25066 need

to be configured to achieve a desired address. Once the ADR pin jumpers are configured for a particular

address, power to the LM25066 needs to be cycled and the GUI restarted in order for the new address to

take effect.

When invalid or incorrect inputs are given to the design tool, text associated with the faulty input will turn

red. Positioning the mouse cursor over the red text will give additional information about any design

conflict.

Component and parametric results are shown to the right as well as the LM25066 operational area chart.

The operational area chart shows the minimum, typical, and maximum SOA protection areas for a given

design. For a robust design, the SOA of the MOSFET used should be above the MAX protection SOA line

for all operating areas. To help make this determination, step 2 allows the user to select the SOA curves

for several popular MOSFETs or to input the SOA data for the desired MOSFET.

Once complete, the design should be saved by selecting the File menu, and then Save. Once the

hardware is modified to match the design, the GUI should be restarted and the hardware configuration file

loaded right after the LM25066 is detected and placed. If the values in the design tool are different than

the values on the board, erroneous telemetry and fault data will be reported by the GUI. To return to the

block view of the device, press the Home button located at the far left in the menu bar.

The design tool is also useful to calculate the PMBus coefficients. With the correct value for current sense

resistor (RS1), the tool will calculate the coefficients to scale the raw telemetry. The coefficients can be

viewed by selecting View from the main menu bar, and then selecting the PMBus Coefficient Editor. When

the PMBus Coefficient Editor is opened, press the Get All button to show the currently used coefficients.

If desired, the equations used in the design tool can be calculated by hand using the equations provided in

the datasheet. However, note that the design tool calculates parameters factoring in worst case

tolerances, while the equations in the datasheet are based on typical thresholds.

11 GUI Register Page

The GUI Register Page, as shown in Figure 10, provides the user with several features to help better

understand the functionality of the LM25066. These features include the ability to read telemetry, device

identification and status registers, as well as being able to monitor the SMBus Alert and PGOOD

interrupts, and to turn the output on and off with the OPERATION button.

10 AN-2100 LM25066 Evaluation Board SNVA464C–December 2010–Revised April 2013

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