Linear Technology DC2028A Bedienungsanleitung

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DC2028A

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DEMO MANUAL DC2028A

DESCRIPTION

8-Channel Power Supply

System Featuring the LTC2977

PMBus Power System Manager

The DC2028A is a demonstration system that showcases

the LT C

2977, an 8-channel I2C/SMBus/PMBus Power

System Manager with EEPROM. The LTC2977 monitors

and controls eight power supply rails. The DC2028A

demonstrates the ability of the LTC2977 to sequence, trim,

margin, supervise, monitor, and log faults for eight power

supplies. Each power supply channel’s output voltage is

monitored and the LTC2977 monitors its own internal die

temperature.

The DC2028A is a single circuit board that contains eight

independent power supply rails. The board employs eight

LTC3405A 300mA switch mode regulators, which are

configured to be controlled by the LTC2977. The DC2028A

demo board provides a sophisticated 8-channel digitally

programmable power supply system. The rail voltages

are programmable within the trim range shown in Table 1.

This demonstration system is supported by the

LTpowerPlay™graphicaluserinterface (GUI) which enables

complete control of all the features of the device. Together,

the LTpowerPlay software and DC2028A hardware system

create a powerful development environment for designing

and testing configuration settings of the LTC2977. These

settings can be stored in the device’s internal EEPROM or

in a file. This file can later be used to order preprogrammed

devicesortoprogramdevicesin aproductionenvironment.

The software displays all of the configuration settings and

real time measurements from the Power System Manage-

ment IC. Telemetry allows easy access and decoding of

the fault log created by the LTC2977. The board comes

preprogrammed with the EEPROM values appropriate for

the eight power supply rails on the DC2028A. Just plug

and play!

Multiple DC2028A boards can be cascaded together to

form a high channel count power supply (see Multi-Board

Arrays). This cascaded configuration demonstrates fea-

tures of the LT C Power System Management ICs which

enable timing and fault information to be shared across

multiple Power System Management ICs. The user can

configureup to eight DC2028A boards, therebycontrolling

up to 64 separate power supply rails. Larger board arrays

L, LT, LTC, LTM, Linear Technology, and the Linear logo are registered trademarks and

LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 7382303, 7420359 and

7940091.

can be built using programmable I2C base addresses or

bus segmentation.

The DC2028A demo board can be powered by an external

power supply, such as a 12VDC supply. Communication

with the software is provided through the DC1613 USB-to-

I2C/SMBus/PMBus controller. The following is a checklist

of items which can be obtained from the LT C website or

LT C Field Sales.

• USB-to-I2C/SMBus/PMBus Controller (DC1613)

• LTpowerPlay Software

Design files for this circuit board are available at

http://www.linear.com/demo

DC2028A FEATURES

nSequence, Trim, Margin, and Supervise Eight Power

Supplies

nManage Faults, Monitor Telemetry, and Create Fault

Logs

nPMBus Compliant Command Set

nSupported by LTpowerPlay GUI

nMargin or Trim Supplies to 0.25% Accuracy

nFast OV/UV Supervisors per Channel

nSupports Multichannel Fault Management

nAutomatic Fault Logging to Internal EEPROM

nOperates Autonomously without Additional SW

nEight OV/UV VOUT and One VIN Supervisor

nTelemetry Reads Back VIN, VOUT, and Temperature

n8-Channel Time-Based Output Sequencer

nI2C/SMBus Serial Interface

nPowered from 6V to 14V

nLTC2977 Available in 64-Lead QFN Package

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DEMO MANUAL DC2028A

PERFORMANCE SUMMARY

POWER SUPPLY CHANNEL CH(0:7)

Manager/Controller LTC2977

Nominal Untrimmed Output Voltages 1.2V, 1.5V, 1.8V, 2.0V,

2.5V, 2.7V, 3.0V, 3.3V

Rated Output Current 0.3A

Default Margin Range ±5%

Output Trim Range (VFS_VDAC = 1.38V) +15%/–11%

Temperature 1 Internal

Specifications are at TA= 25°C

Common Characteristics Specifications Valid Over Full Operating Temperature Range

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Input Voltage Range 6 14 V

ADC Total Unadjusted Error VIN_ADC ≥ 1V ±0.25 %

ADC Voltage Sensing Input Range Differential Voltage: VIN_ADC = (VSENSEP[n] – VSENSEM[n]) 0 6 V

The following list contain terms used throughout the

document.

Channel – The collection of functions that monitor, su-

pervise, and trim a given power supply rail.

EEPROM – Non-volatile memory (NVM) storage used to

retain data after power is removed.

Margin – Term used typically in board level testing that

increases/decreases the output voltage to look for sensi-

tivity/marginality problems.

Monitor – The act of measuring voltage, current, and

temperature readings.

NVM – Non-volatile memory, see EEPROM.

PMBus – An industry standard power management proto-

col with a fully defined command language that facilitates

communication with power converters and other devices

in a power system.

Rail – The final output voltage that the power supply

controller manages.

Supervise – The act of quickly responding to a voltage,

current, temperature condition that is compared to pre-

programmed values (fault settings).

Trim – The act of adjusting the final output voltage. A servo

loop is typically used to trim the voltage.

GLOSSARY OF TERMS

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DEMO MANUAL DC2028A

LTpowerPlay is a powerful Windows based development

environment that supports Linear Technology power

system management ICs with EEPROM, including the

LTC2977 8-channel PMBus Power System Manager. The

software supports a variety of different tasks. You can use

LTpowerPlay to evaluate Linear Technology ICs by con-

necting to a demo board system. LTpowerPlay can also

be used in an offline mode (with no hardware present) in

order to build a multi-chip configuration file that can be

saved and reloaded at a later time. LTpowerPlay provides

unprecedentedsystemlevel diagnostic and debug features.

It becomes a valuable diagnostic tool during board bring

up to program or tweak the power management scheme

in a system or to diagnose power issues when bringing

up rails. LTpowerPlay utilizes the DC1613 I2C/SMBus/

PMBus controller to communicate with one of many po-

tential targets, including the DC2028A demo system or a

customer board. The software also provides an automatic

update feature to keep the software current with the latest

set of device drivers and documentation. The LTpowerPlay

software can be downloaded from:

http://www.linear.com/ltpowerplay

To access technical support documents for LT C Power

System Management Products visit Help, View Online

Help on the LTpowerPlay menu.

Figure 1. Screenshot of the LTpowerPlay GUI

LTpowerPlay GUI SOFTWARE

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DEMO MANUAL DC2028A

QUICK START PROCEDURE

The following procedure describes how to set up a DC2028A demo system.

1. Download and install the LTpowerPlay GUI: www.linear.com/ltpowerplay

2. Remove the board from the ESD protective bag and place it on a level surface. Connect the DC1613 I2C/SMBus/

PMBus controller to the DC2028A board using the 12-pin ribbon cable.

3. Confirm that the CONTROL switch is set to the RUN position.

4. Plug the USB-to-I2C/SMBus/PMBus controller into a USB port on your PC. The board should power-up with all power

good LEDs and 5V LED illuminated green. The USB-to-I2C/SMBus/PMBus controller supplies ~100mA of current

which should be sufficient for a single demo board.

5. If multiple boards are being powered, connect a 12VDC power supply with > 0.5A capacity to the VIN input jack of

the DC2028A.

6. Launch the LTpowerPlay GUI.

a. The GUI automatically identifies the DC2028A and builds a system tree for each

power manager. The system tree on the left hand side will look like this:

Note: For multiple board arrays, the GUI automatically ensures each device has

a unique address. In this scenario, it is recommended at this point to store these

addresses to NVM (EEPROM) by clicking the RAM to NVM icon in

the toolbar.

Figure 2. Connecting DC2028A Board and the DC1613 I2C/SMBus/PMBus Controller

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DEMO MANUAL DC2028A

b. A green message box will be displayed momentarily in the lower left hand corner confirming that the DC2028A

is communicating.

QUICK START PROCEDURE

c. Save the demo board configuration to a (*.proj) file by clicking the Save icon. This creates a backup file. Name

it whatever you want.

7. The CONTROL switch is configured to control all eight channels. Slide the switch to RUN to enable, OFF to dis-

able all channels. For multiple board arrays, the CONTROL switch is wired to a signal that is common across all

boards. All CONTROL switches must be set to the RUN position to enable all boards.

LOADING A DC2028A CONFIGURATION (*.proj) FILE WITH THE GUI

1. In the upper left hand corner of the GUI, File > Open > browse to your *.proj file. This will load the file into the GUI.

2. Click on the Go Online icon, then click on the PC->RAM icon. This loads the configuration into the

working RAM of the LTC2977.

3. To store the configuration to NVM (EEPROM), click on the RAM->NVM icon.

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DEMO MANUAL DC2028A

DC2028A DETAILS – TOP SIDE

Figure 3. DC2028A Top Side Details

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DEMO MANUAL DC2028A

COMMON DEMO BOARD OPERATIONS

MARGIN ALL RAILS

The LTC2977 Power System Manager on the DC2028A not only monitors

each of the eight outputs but can margin the outputs either high or low.

Margining is the operation that moves a rail either up or down for testing

purposes. It allows a system to be fully characterized over supply limits

without the use of external hardware or resources. The GUI provides an

easy way to margin all rails high or all low by clicking one of four buttons.

To invoke the margining dialog, click the GroupOp icon in the toolbar.

The buttons labeled ignore faults will margin without creating a fault

even if the fault limits are exceeded.

A look at the telemetry window shows the effect of the margin high or

margin low operation. The screen shot shows all rails going from nominal

setpoints to margin high, margin low, and back to nominal voltages.

The LTC2977 has a multiplexed ADC that is used to provide voltage, cur-

rent, and temperature readback values. The telemetry plot in the GUI is

similar to a multi-channel oscilloscope which is capable of displaying any

parameter that is displayed in the telemetry window. Due to the nature

of a multiplexed ADC converter, it has an associated ADC loop time. The

total ADC loop time (~100-160ms) for a given channel is dependent on

the device’s configuration.

CREATING A FAULT

There is a pushbutton on the DC2028A board that is used to force a fault

and demonstrate the demo board’s ability to detect it and respond accord-

ing to the configuration. When depressed, the pushbutton creates a fault

(short to ground) on channel 7, the 3.3V output (GUI channel U0:7). The

user should see all outputs power off, the fault LED momentarily illuminate,

the alert LED illuminate continuously, and all rails sequence

back on after a retry period. The user may also short any

power supply output indefinitely. This is a good way to

induce UV faults and shows that a shorted channel will not

be damaged. Use a jumper wire or a coin to short any

output.

dc2028af

DEMO MANUAL DC2028A

The LTC2977 has a feature which allows supply rails to

sequence off in a controlled manner in response to a fault

condition, as opposed to turning all rails off immediately.

The SequenceOffOnFault bit in the MFR_CONFIG_LTC2977

demo board has been configured to sequence off all channels

when a fault occurs. Pressing the SHORT pushbutton causes

the Fault pin to be asserted low which triggers all rails to

power down based on the TOFF_DELAY times.

COMMON DEMO BOARD OPERATIONS

Figure 4 shows FAULTB asserting low, and each of the channels sequencing off per the TOFF_DELAY settings. Figure 5

shows the same except that the 3.0V rail (CH4) does not have its SequenceOffOnFault bit set. The 3.0V rail powers

down immediately as defined by the fault response setting.

Figure 4. Sequencing Off (SeqOffOnFault=1) Figure 5. Sequencing Off (SeqOffOnFault=0)

CLEARING A FAULT

To clear a fault, the user may click the CF icon in the GUI or simply push the RESET pushbutton on the

demo board. In both cases, the red (+) on the CF icon and alert LED on the board will be cleared. You will

notice that all rails are automatically re-enabled after a programmable retry period. The alert LED may be

cleared by clicking the clear faults (CF) icon in the GUI. After clearing faults, the system tree may remain yellow if any

non-volatile fault logs are present. For further information, see the Working with the Fault Log section.

RESETTING THE DC2028A

A reset pushbutton is provided on the board. To reset all devices on the DC2028A board and reload the EEPROM

contents into operating memory (RAM), press RESET (SW2) on the DC2028A.

dc2028af

DEMO MANUAL DC2028A

DC2028A LEDS

Each individual channel on DC2028A has its own green power good LED (CH0 through CH7). When USB power (DC1613

controller) or external power (6V to 14V jack) is applied, the 5V green LED will illuminate, indicating that the LTC2977

Power System Manager is powered. The red LEDs will illuminate when an alert or a fault has occurred.

SEQUENCING OUTPUT CHANNELS

The LTC2977 has been preconfigured with different TON_DELAY values for each channel. The TON_DELAY parameter

is applied to each device relative to the respective CONTROL pin. When multiple demo boards are connected together,

all CONTROL pins are wire OR’d. Therefore the TON delays are enforced relative to one edge. The same applies to

TOFF_DELAY values. When the CONTROL switch is set to the OFF position, all rails will power down sequentially

based on each of the device’s TOFF_DELAY values. Figure 6 shows an oscilloscope screen capture of three output rails

sequencing up and down in response to the CONTROL pin.

COMMON DEMO BOARD OPERATIONS

Figure 6. Sequencing Output Channels with DC2028A Using TON_DELAY and TOFF_DELAY

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