Linear Technology DC980A Manuale utente

dc980abf

DEMO MANUAL

DC980A/DC980B

DESCRIPTION

Dual Power Supply Monitor

and Margining Controller with LTC3828

Dual DC/DC Supply

TheDC980AandDC980Bareademonstrationsystemthat

showcasestheLTC2970,adualpowersupplymonitor and

margining controller with an I2C interface. The DC980A

board contains the LTC2970 device and the DC980B

board contains the LTC3828 dual DC/DC controller. The

two boards interface to each other via a 20-pin connec-

tor. The DC980B board features the LTC3828 dual output,

2-phase synchronous buck regulator. The LTC2970’s

two voltage-buffered, 8-bit IDACs allow highly accurate

margining of the LTC3828’s output voltages. The IDACs

can be configured to automatically servo the power sup-

plies to a desired voltage using the ADC for feedback. The

DC980B comes preconfigured with 3.3V and 5V power

supply rail voltages.

The LTC2970’s low drift reference and 14-bit ∆∑ A/D

converter allow precise measurements of two power sup-

ply output voltages and load currents. Fault management

allows ALERTB to be asserted for configurable over- and

undervoltage fault conditions.

This demonstration system is supported by the

LTpowerPlay™graphicaluserinterface(GUI)whichenables

completecontrolof all thefeaturesof the device.Together,

theLTpowerPlaysoftwareand DC980A/DC980B hardware

system create a powerful development environment for

designing and testing hardware configurations for the

LTC2970.ThesoftwaredisplaystheLTC2970featuresand

provides real time measurements from the device’s ADC

and status registers. Telemetry also allows easy access

of the fault status created by the LTC2970.

The LTC2970 features may be evaluated with the LTC3828

based power supplies, or alternatively the DC980B board

may be removed and DC980A can then be connected to

an external power supply circuit.

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.

The DC980B demo board is powered by an external 8V

to 15V power supply. To power the DC980A demo board,

you have two choices. It may be powered from either the

DC590 USB-to-I2C controller or from the DC980B board

using an external jumper wire. Communication with the

software is provided through the DC590 USB-to-I2C con-

troller. The following is a checklist of items which can be

obtained from the LTC website or LTC field sales.

nUSB-to-I2C/Serial Controller (DC590)

nLTpowerPlay Software

DC980A/DC980B Features

nMonitors and Margins Two Power Supplies

nTwo Output Voltage Monitors

nTwo Input Voltage Monitors

nTwo Output Current Monitors

nTelemetry Reads Back VIN, VOUT, IOUT, Temperature

nSupported by LTpowerPlay GUI

nI2C Adjustable OV/UV Trip Points

nMargin or Trim Supplies to ±0.5% Accuracy

nI2C/SMBus Serial Interface

nProgrammable GPIO for Fault Reporting

nPowered from External Power Supply

nLTC2970 Available in 24-Pin QFN Package

Design files for this circuit board are available at

http://www.linear.com/demo/DC980

dc980abf

DEMO MANUAL

DC980A/DC980B

GLOSSARY OF TERMS

The following list contain terms used throughout the

document.

Channel: The collection of functions that monitor, super-

vise, and trim a given power supply rail.

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 tem-

perature readings.

Rail: The final output voltage that the power supply con-

troller manages.

Supervise: The act of quickly responding (warning or

faulting) to a voltage or current condition that is compared

to preprogrammed values.

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

loop is typically used to trim the voltage.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

Table 1. LTC2970 Performance Summary

PARAMETER CONDITIONS VALUE

12VIN Supply Input Voltage Range 8V to 15V

VDD Supply Input Voltage Range 4.5V to 5.75V

ADC Full-Scale Accuracy ±0.4%

ADC Total Unadjusted Error VIN = 3V ±0.5%

ADC Input Range 0V to 6V

ADC Resolution Resolution = 8.192V/16384 500µV/LSB

ADC Conversion Rate 30Hz

Margining DAC Resolution 8-Bits

Temperature Sensor Resolution 0.25°C/LSB

I2C Serial Clock Frequency 10kHz to 400kHz

Table 2. Demo Board System Specifications

NOMINAL

UNTRIMMED

VOUT

TOP FEEDBACK

RESISTOR

BOTTOM

FEEDBACK

RESISTOR

DAC RESISTOR IDAC

RESISTOR

MARGIN

RANGE

VOUT1 5V ±1.5% 105k 20k 147k 6.34k ±10%

VOUT2 3.3V ±1.5% 95.3k 30.1k 196k 6.34k ±10%

Notes:

1. Load current < 5A is recommended.

2. Output voltages can be margined by ±10% from nominal with the default resistor values. These values may be changed

to create output voltages other than 5V and 3.3V. Use the Resistor Selection Tool which is accessed from LTpowerPlay.

The LTC3828’s feedback node voltage is 0.8V.

dc980abf

DEMO MANUAL

DC980A/DC980B

LTpowerPlay GUI SOFTWARE

LTpowerPlay is a powerful Windows-based tool that sup-

ports Linear Technology products, including the LTC2970

dual power supply monitor and margining controller. You

can use LTpowerPlay to evaluate Linear Technology ICs by

connecting to a demo board system. LTpowerPlay utilizes

the DC590 USB I2C/serial controller to communicate with

one of many potential targets, including the DC980A/B

demo system or a customer board. The software also

provides an automatic update feature to keep the software

currentwiththelatestsetofdevicedriversanddocumenta-

tion. The LTpowerPlay software can be downloaded from:

http://www.linear.com/ltpowerplay

To access technical support documents for LTC Power

System Management Products visit Help, View Online

help on the LTpowerPlay menu.

Figure 1. Screenshot of LTpowerPlay GUI

SYSTEM TREE OF

ALL DEVICES

CONFIGURATION SETTINGS FOR

ALL DEVICES IN SYSTEM TREE

REAL-TIME

TELEMETRY DATA

SCOPE-LIKE

TELEMETRY WINDOW

DISPLAY OF SELECTED PARAMETER

(CONFIGURATION OR TELEMETRY) CHIP DASHBOARD

dc980abf

DEMO MANUAL

DC980A/DC980B

QUICK START PROCEDURE

The following procedure describes how to set up a DC980A, DC980B, and DC590 for demonstration purposes or to

evaluate the performance of the LTC2970.

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

2. The default locations of DC980A’s configuration jumpers are as follows:

JP1

ASEL0

JP2

ASEL1

JP3

GRIO_CFG

JP4

WRITE-

PROTECT

JP5

DAC1

TERMINATION

JP6

DAC0

TERMINATION

JP7

VDD

SOURCE

LO LO GND ON IOUT0 IOUT1 DC590

3. The default locations of DC980B’s configuration jumpers are as follows:

JP1

PHSMD

JP2

FSET

JP3

FCB

JP4

RUN1

JP5

RUN2

JP6

TRACK2

JP7

TRACK1

0 550kHz CCM ON ON EXT1 VOUT1

4. Connect the DC980A and DC980B boards using the 20-pin analog interface connector. Connect DC980A to the

DC590 USB I2C/serial controller using the supplied 14-conductor ribbon cable.

5. Connect a power supply (8V to 15V) to the DC980B’s VIN and GND turrets. Refer to Figure 2 for the connections.

NOTE: Make sure that the input voltage does not exceed 15V. Be sure JP7 on the DC980A board is set to DC590.

Figure 2. Connecting DC980A/DC980B Boards and the DC590 I2C/Serial Controller

dc980abf

DEMO MANUAL

DC980A/DC980B

QUICK START PROCEDURE

6 .Connect the USB cable from the host computer to the DC590. Launch LTpowerPlay. The software automati-

cally identifies the DC980A and builds a system tree for the LTC2970. The GUI should appear as that shown in

Figure 1.

a. Load default configuration into the LTC2970. From the pull-down menu select Demo > Demo Config.

b. Check for the LTC3828 output voltages by clicking on CHO_A_ADC_LTC2970 or CH1_A_ADC_LTC2970.

dc980abf

DEMO MANUAL

DC980A/DC980B

QUICK START PROCEDURE

c. Check VDD and V12 input voltages Note: If JP7 is set to DC590 position, the V12 telemetry reading

will be ~5V.

dc980abf

DEMO MANUAL

DC980A/DC980B

Figure 3. Connecting DC980A/B Boards with VIN Jumper to 12VIN Turret

ALTERNATE DC980A POWERING METHOD

The DC980A board may be powered from the input supply

that powers the DC980B board. This configuration allows

the LTC2970 to make a direct reading of VIN and display

the readback value in the V12_ADC_LTC2970 register in

LTpowerPlay. It requires an external jumper wire. Ensure

thatallpowerisremovedfrombothboards.OntheDC980A

board, move jumper JP7 to the LOCAL position. Place a

jumper wire between the VIN turret of the DC980B and

the 12VIN turret of the DC980A. Note that the LTC2970’s

voltage range is 8V to 15V. Ensure that the DC980B is

The 12V telemetry register and plot should look like this:

dc980abf

DEMO MANUAL

DC980A/DC980B

DC980A DETAILS

Figure 4. DC980A Board

dc980abf

DEMO MANUAL

DC980A/DC980B

DC980B DETAILS

Figure 5. DC980B Board

dc980abf

DEMO MANUAL

DC980A/DC980B

PARTS LIST—DC980A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP CER 1µF 16V 20% X7R 0603 TDK C1608X7R1C105M

2 2 C2, C15 CAP TANTALUM 10µF 25V 20% 6032 AVX TAJW106M025R

3 2 C9, C13 CAP CER 0.1µF 16V 20% X7R 0603 AVX 0603YC104MAT

4 1 D1 DIODE, SCHOTTKY 200mW SOT-23 DIODES INC BAT54

5 1 R1 RES 10kΩ 0.1W 5% 0603 SMD VISHAY CRCW0603103JRT6

6 1 R2 RES 100kΩ 0.1W 5% 0603 SMD VISHAY CRCW0603100KFKEA

7 13 R3, R7 TO R11, R15,

R16, R19 TO R23 RES 0Ω 0.1W 0603 SMD VISHAY CRCW0603000ZRT6

8 3 R4, R5, R6 RES 2kΩ 0.1W 1% 0603 SMD VISHAY CRCW06032K00JNEA

9 3 R12, R13, R14 RES 4.99kΩ 0.1W 1% 0603 SMD VISHAY CRCW06034K99JNEA

10 2 R17, R18 RES 6.34kΩ 0.1W 1% 0603 SMD VISHAY CRCW06036K34JNEA

11 1 U1 IC, 2-CH POWER SUPPLY MONITOR AND MARGIN

CONTROLLER LINEAR TECHNOLOGY LTC2970CUFD

12 1 U2 IC, 2k-Bit I2C SERIAL EEPROM MICROCHIP 24LC025-I/ST

Additional Demo Board Circuit Components

13 0 C3, C4, C5, C8, C10 TO

C12, C14 (OPT)OPTION - DO NOT STUFF

14 0 C6, C7 (OPT) OPTION - DO NOT STUFF

Hardware: For Demo Board Only

15 1 J1 2MM PIN HEADER, 2x7 MOLEX 87831-1420

16 1 JP8 CONN HEADER, 2x10 RIGHT ANGLE MILL-MAX 802-10-020-20-001

17 7 JP1 TO JP7 2MM PIN HEADER, 1x3 SAMTEC TMM-103-02-L-S

18 4 MH1 TO MH4 STANDOFF, NYLON SNAP-ON KEYSTONE 8831

19 7 SH1 TO SH7 SHUNT FOR 2MM PIN HEADER SAMTEC 2SN-BK-G

20 18 TP1 TO TP18 TERM SOLDER TURRET 0.219" 0.078"L MILL MAX 2501-2-00-80-00-00-07-0

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