Linear Technology DC1540B Guida rapida alla configurazione

dc1540bf

DEMO MANUAL DC1540B

DESCRIPTION

LTC2977 8-Channel

Power System Manager

with EEPROM

The DC1540B is a demonstration system for the LT C

2977

8-channel I2C/SMBus/PMBus Power System Manager

with EEPROM. It consists of 2 circuit boards namely the

DC1360B and DC1361B. The DC1360B contains all the

circuitry needed to insert the LTC2977 into a power system

and control eight power supplies. The DC1361B contains

eight power supplies (LTM4603EV) which are conﬁgured

to be controlled by an LTC2977. Together these two boards

form a sophisticated, 8-channel, digitally programmable

power supply.

ThisdemonstrationsystemissupportedbyLTpowerPlay™

software and a graphical user interface (GUI) that enables

completecontrolofalltheLTC2977features.Youcan obtain

this GUI from the website www.linear.com/ltpowerplay.

com. LTpowerPlay and the DC1540B, create a powerful

developmentenvironmentin which you can design conﬁg-

urationsettings for theLTC2977.Theconﬁgurationsettings

can be stored in the LTC2977 EEPROM and also in a ﬁle,

which can be used to order pre-programmed devices.

LTpowerPlay displays all of the conﬁguration settings and

real-time measurements that the LTC2977 performs and

allows easy access to the fault log created by the LTC2977.

TheLTC2977 ontheDC1360Bcomespre-programmed with

EEPROM values appropriate for the eight power supplies

used on the DC1361B.

The LTC2977 can be conﬁgured to monitor current

on odd numbered channels. In the DC1540B, this

feature can be enabled on Channel 7 (see “Measur-

ing Current”). Channels 1 and 2 can be conﬁgured

to do coincident tracking of Channel 0 by using JP2

and JP3 (see “DC1361B Details – Top Side”). An LTC

HotSwap™circuiton the DC1361B enables the LTC2977 to

soft-start VIN and shut off VIN in response to output faults.

Multiple DC1540Bs can be cascaded together to form

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

Arrays”). This conﬁguration demonstrates features of the

LTC2977 which allow timing and fault information to be

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

LTpowerPlay and Hot Swap are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

shared across multiple LTC2977s, allowing the formation

of a single, coherent power supply control system. This

conﬁguration is easily supported by the LTpowerPlay

GUI and allows the user to conﬁgure up to 9 LTC2977s,

controlling up to 72 separate power supplies.

To get this demo system up and running, connect the

DC1540B to your computer using a DC1427A or a DC1613

(USB to I2C/SMBus/PMBus Controller). The following is

a checklist of items which you can obtain from the LTC

website or LTC Field Sales.

n USB to I2C/SMBus/PMBus Controller (DC1613A)

n LTpowerPlay GUI

n LTC2977 Resistor Selection Tool for calculating

resistors values and proper DAC range settings

(in the GUI)

LTC2977 Features

• I2C/SMBus Communication

• Conﬁguration EEPROM

• PMBus Compliant

• Fault Logging to Internal EEPROM

• Differential Input, 16-bit ∆S ADC with less than ±0.25%

of Total Unadjusted Error Using On-Chip Reference

• Monitors Eight Output Channels and One Input Voltage

• Programmable Watchdog Timer

• 8-Channel Sequencer

• Eight 10-Bit OV/UV Supervisors

• Eight 10-Bit Margin/Trim DAC’s with Soft-Connect

• A Closed-Loop Digital Servo Accurately Trims the Outputs

• Supports Multi-Channel Fault Management

• Programmable Fault Responses

• On-Chip Digital Temperature Sensor

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

dc1540bf

DEMO MANUAL DC1540B

Table 1. LTC2977 Performance Summary (Specifications are at TA= 25°C)

PARAMETER CONDITION VALUE

VPWR Supply Input Voltage Range 4.5V to 15V

VDD33 Supply Input Voltage Range 3.13V to 3.47V

ADC Total Unadjusted Error VIN ≥ 1V ±0.25%

ADC Voltage Sensing Input Range –0.1V to 6V

ADC Current Sensing Input Range –170mV to 170mV

ADC Voltage Sensing Resolution 0V ≤ VIN_ADC ≤ 6V 122µV/LSB

ADC Current Sense Resolution 0mV <|VIN_ADC| < 16mV

16mV <|VIN_ADC| < 32mV

32mV <|VIN_ADC| < 63.9mV

63.9mV <|VIN_ADC| <127.9mV

127.9mV <|VIN_ADC|

15.6µV/LSB

31.25µV/LSB

62.5µV/LSB

125µV/LSB

250µV/LSB

Voltage Buffered IDAC Resolution

10 bits

Buffer gain setting 0 1.38mV/LSB

Buffer gain setting 1 2.65mV/LSB

Temperature Sensor TUE ±1°C

Voltage Supervisor Input Voltage

Range (Programmable)

VSENSEP[n] Low resolution 0 to 6V

High resolution 0 to 3.8V

VSENSEM[n] –0.1 to 0.1V

Voltage Supervisor Sensing Resolution 0V to 3.8V range: 4.096/1024 4mV/LSB

0V to 6V range: 8.192/1024 8mV/LSB

Voltage Supervisor

Total Unadjusted Error

2V < VIN_VS < 6V, Low Resolution Mode ±1.25 %

1.5V < VIN_VS < 3.8V, High Resolution Mode ±1.0 %

0.8V < VIN_VS < 1.5V, High Resolution Mode ±1.5 %

I2C Serial Clock Frequency 10kHz to 400kHz

Demo System Speciﬁcations

Table 2. Specifications-DC1361B

VOUT Name Nominal Voltage-Untrimmed

VOUT_0 3.325V ± 1.5%

VOUT_1 2.497V ± 1.5%

VOUT_2 1.989V ± 1.5%

VOUT_3 1.804V ± 1.5%

VOUT_4 1.502V ± 1.5%

VOUT_5 1.200V ± 1.5%

VOUT_6 0.999V ± 1.5%

VOUT_7 0.799V ± 1.5%

Notes:

• Loadcurrentlessthan2Aoneachoutputisrecommended.

• Max current into J11 (+12V) should be < 6A max.

• Output voltages can be margined by a minimum of

±15% from nominal with the default resistor values

on the DC1361B. These values can be easily changed.

See section Changing DC1361B Nominal Output Volt-

ages. Use the LTC2977 Resistor Selection Tool which

is accessed from LTpowerPlay.

dc1540bf

DEMO MANUAL DC1540B

Figure 1. Single LTC2977 Demo Setup Using DC1540B

Demo System Hardware

Hardware required:

1. PC + USB cable

2. 12V, >0.5A power supply

3. USB to I2C/SMBus/PMBus Controller

4. DC1540B = DC1360B + DC1361B

DOWNLOAD GUI TO YOUR PC

LTpowerPlay can be downloaded from www.linear.com/ltpowerplay. Complete instructions are located there.

What Can You Do With This Demo System ?

• Prototype your system. You can change the nominal

VOUT’s of the modules to match your system. You can

also change the range and resolution of margining. Set

sequencing. Set OV/UV limits. And much more!

• Create your own conﬁguration that you can store in the

EEPROM of the LTC2977 or save to a ﬁle. This ﬁle can

be used to order pre-programmed parts.

• Test most conceivable fault scenarios. All outputs can

be shorted.

dc1540bf

DEMO MANUAL DC1540B

QUICK START PROCEDURE

The following procedure describes how to set up one DC1540B.

1. Remove both boards from bag.

2. Place boards on level surface. Connect boards together using the 54-pin edge connector. See below.

Figure 2. Plug Boards Together

3. On DC1360B, set jumpers and switches as follows. See also Table 3.

a. Set both SW1 and SW2 (CONTROL0 and CONTROL1) to GND.

b. Set JP5 to OFF.

c. Make sure JP6 is installed.

d. Set JP3 (ASEL0) to LO and JP2 (ASEL1) to LO.

e. Set JP4 to ON.

4. On DC1361B, set jumpers and switches as follows. See also Table 3.

a. JP1 = INSTALLED

b. JP2, JP3 = SOFT START

c. SW1 = MASTER

5. Plug in the USB to I2C/SMBus/PMBus Controller into a USB port on your PC.

6. Connect a 12V power supply with >1/2 Amp capacity to the VIN+ and VIN– inputs of the green terminal block J11

on DC1361B. Do not turn on 12V yet. Be careful to hook up polarity correctly! See Figure 5.

7. If you have a DC1427A, connect to J4 on DC1360B as shown in Figure 3.

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DEMO MANUAL DC1540B

QUICK START PROCEDURE

Figure 3. DC1427A Connection

Figure 4. DC1613 Connection

dc1540bf

DEMO MANUAL DC1540B

QUICK START PROCEDURE

8. Launch the LTpowerPlay GUI.

a. The GUI should identify the LTC2977. The system tree on the left hand side should look like:

b. Conﬁrm that the LTC2977 is communicating. A green message box shows for a few seconds in the lower left

hand corner

c. In the Toolbar, click the “R” icon to read the RAM from the LTC2977. This reads the default conﬁguration from

the RAM in the LTC2977 on the DC1360B and loads it into the GUI.

d. Save the demo board default conﬁguration to a (*.proj) ﬁle. Click the “Save” icon and save the ﬁle. You can

chose your own ﬁlename.

9. Turn on the +12V power supply.

10. Slide the 2 black switches CONTROL 0 and CONTROL 1 to the HI position. This turns on the board.

dc1540bf

DEMO MANUAL DC1540B

QUICK START PROCEDURE

The System Tree on the left hand side should turn all green. All 8 green LEDs on the DC1361B should illuminate.

11. You are now ready to execute one of the LTC2977 demos embedded in the GUI or experiment with the part.

LOADING A 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 arrow. This loads the ﬁle into the working RAM of the LTC2977.

3. To store in EEPROM, click on the STORE button. It is the icon with the “W” on it (see below).

NOTES:

1. To conﬁgure the jumpers and switches, see Tables 3, 4, 5 and 6. If using more than one LTC2977, use the ASELs

to assign different addresses for each LTC2977.

2. On DC1361B, set the MASTER/SLAVE switch to MASTER if you want the Hot Swap chip to shut off in response to

an output OV fault. To recover from shut off, you must command the channel that produced the OV off then on

with the OPERATION command or you can toggle the VinShareEnable bit in MFR_CONFIG_ALL_LTC2977 to 0 then 1.

3. When the USB to I2C/SMBus/PMBus controller power is applied, the LTC2977 will load the contents of its EEPROM

into operating RAM.

4. For help on any command, highlight the command in the GUI and press F1.

5. The LTM4603 outputs may be shorted indeﬁnitely. This is a good way to induce UV faults.

6. If the DC1360B is used without the DC1361B, it will report an overtemperature fault because its VSENSE inputs

are ﬂoating. This may be avoided by tying the VSENSE inputs to deﬁned voltages.

dc1540bf

DEMO MANUAL DC1540B

DC1540B - DETAILS (DC1360B +DC1361B)

Figure 5. DC1540B Details

dc1540bf

DEMO MANUAL DC1540B

DC1360B DETAILS - TOP SIDE

Figure 6. DC1360B Top Side

Table 3. DC1360B - Default Jumper Configuration. Use ASEL’s to Select I2C Address.

JP2

ASEL1

JP3

ASEL0

JP4

Write-Protect

JP5

LTC2977 Write

Protect

JP6

Share_CLK

LO LO ON OFF Installed

dc1540bf

DEMO MANUAL DC1540B

DC1360B DETAILS - BOTTOM SIDE

Figure 7. DC1360B Bottom Side Conﬁguration Resistors

Table 4. Optional Configuration Resistors

REF Des Signal Usage Default Comment

R9 FAULTB10 to FAULTB01 Connect Fault Zone 0 to Fault Zone 1 INSTALLED Allows Fault Zone 0 to

Connect to Fault Zone 1

R19, R24, R29, R34 FAULT1 to FAULT4 to

FAULT00 to FAULT11

Connect LTC2977’s FAULTB Pin to

Demo Board FAULT Lines

INSTALLED Allows Faults to Propagate

Between Boards

R21, R22, R23, R25, R26, R27,

R28, R30, R31, R32, R33

FAULT 1 to FAULT 4 Connect any FAULTB Pin to any of

Fault Line: FAULT 1,2,3,4

OPEN Allows Faults to Propagate

Between Boards.

R17 ALERTB Allow DC1427A to Receive ALERTB OPEN

R65 WDI/RESET DC1427A Drives WDI/RESETB OPEN

R18 AUXP DC1427A Sources BIGPWR INSTALLED BIGPWR + LGKPWR must be

<= 100mA max TOTAL

R72 WDI/RESET DC1427A Drives WDI/RESET OPEN

R73 CONTROL0 DC1427A Drives CONTROL0 OPEN

R74 CONTROL1 DC1427A Drives CONTROL1 OPEN

Conﬁguration resistors are on the bottom side. They allow multiple ways to make fault dependencies between boards.

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