Linear ADI Power LTC7871 Guida rapida alla configurazione

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

DESCRIPTION

LTC7871/LTC7060

High Power PolyPhase

Bidirectional Supply/Charger

All registered trademarks and trademarks are the property of their respective owners.

Demonstration circuit 2886A is a high power, high effi-

ciency six-phase bidirectional converter featuring the

LTC

7871 and LTC7060. The terminals labeled VHIGH

and VLOW are either inputs or outputs depending on the

direction of power flow. When the switch at SW1 is in the

BUCK position, VLOW provides a 14V output and VHIGH is

the input with a range of 30V to 70V. When the switch

is in the BOOST position, VHIGH provides a 48V output

and VLOW is the input with a range of 10V to 14V. The

maximum VLOW current is 180A in both directions. The

maximum output power is 2.5kW when operating as a

buck within the input voltage range. When operating as

a boost, the maximum output power is 2.4kW when the

input voltage is 14V. External airflow is required when

operating at maximum power. The MOSFETs in each

phase are driven by the LTC7060 half bridge driver. Each

LTC7060 gate driver is placed next to the MOSFETs and

receives a PWM signal from the LTC7871.

The inductor current for each phase is sensed with a low

1mΩ sense resistor using a highly accurate AC/DC cur-

rent sensing architecture with low power dissipation. The

LTC7871’s constant-current loop provides a DC current

limit for the current flowing in or out of the V

LOW

terminal

depending on the state of the BUCK pin. This current can

be programmed with the SETCUR pin and monitored with

the IMON pin.

The DC2886A provides a SPI compatible serial port. With

a DC2026C (Linduino

One) demo board and QuikEval™

software on a host computer, the user can:

• Margin the regulated VLOW or VHIGH up or down.

•Margin the DC current limit up or down with the

SETCUR pin.

•Adjust the frequency spread and modulation rate of

the spread spectrum circuit, when spread spectrum

isenabled.

•Monitor the operational status and faults of

theLTC7871.

Additional features of the DC2886A include:

• Pin selectable light load operating modes

– Buck:FCM, pulse-skipping and Burst Mode

Operation

– Boost: FCM and pulse-skipping

• SYNC and CLKOUT pins

•Optional jumper to enable spread spectrum modulation

• RUN, FAULT, PGOOD and PWNEN pins

•BUCK pin to externally control the direction of

powerflow

• Footprint for an optional heatsink

Design files for this circuit board are available.

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Buck Mode

VHIGH Supply Range 30 48 70 V

VLOW Output Voltage 13.6 14.0 14.4 V

ILOW(MAX) 180 A

fSWITCH Operating Frequency 150 kHz

Efficiency VHIGH = 48V

ILOW = 180A

400LFM Airflow

97.5 %

Boost Mode

VLOW Supply Range 10 12 14 V

VHIGH Output Voltage 46.9 48.4 49.8 V

IHIGH(MAX) VLOW = 14V

VLOW = 12V

VLOW = 10V

fSWITCH Operating Frequency 150 kHz

Efficiency VLOW = 14V

IHIGH = 51A

400LFM Airflow

97.2 %

BOARD PHOTO

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

Figure1. Proper Measurement Equipment Setup for BUCK Mode

QUICK START PROCEDURE

Instructions for operating the DC2886A are below.

Constant-Voltage (CV) Buck Mode

1. Refer to the connection diagram shown in Figure1.

2. Place SW1 in the BUCK position.

3. Connect the input supply to VHIGH and the load to

VLOW. Next connect the voltmeters to monitor VHIGH

and VLOW.

4. Turn on the V

HIGH

supply. With no load, slowly increase

the VHIGH supply until VHIGH reaches 30V. At this point,

14V should appear on VLOW. The regulation limits are

shown in the Performance Summary section.

5. Next, increase VHIGH to 48V. Recheck the regulation.

6. Apply load up to 180A across VLOW. Recheck

theregulation.

7. After the basic performance has been verified, the

other aspects of performance can be measured

andobserved.

NOTE:

MONITOR VHIGH ACROSS

C54 OR C61 FOR ACCURATE

EFFICIENCY MEASUREMENTS.

NOTE:

MONITOR VLOW ACROSS

C72 OR C66 FOR ACCURATE

EFFICIENCY MEASUREMENTS.

–

IHIGH

ILOW

VHIGH

SUPPLY

LOAD

–

PLACE SW1 IN BUCK POSITION

VLOW

VHIGH

+–

dc2886a F01

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

5. Next, increase VLOW to 14V. Recheck the regulation.

6. Apply load up to 51A across VHIGH. Recheck

theregulation.

7. After the basic performance has been verified, the

other aspects of performance can be measured

andobserved.

Note:When measuring the output voltage or input

voltage ripple, be sure to measure directly across an

output or input capacitor. Do not use the ground lead

on the oscilloscope probe. See Figure3.

Constant-Voltage (CV) Boost Mode

1. Refer to the connection diagram in Figure2.

2. Place SW1 in the BOOST position.

3. Connect the input supply to VLOW and the load to

VHIGH. Next connect the voltmeters to monitor VLOW

and VHIGH.

4. Turn on the VLOW supply. With no load, slowly increase

the VLOW supply until VLOW reaches 10V. At this point,

48V should appear on the output. The regulation limits

are shown in the Performance Summary section.

Figure2. Proper Measurement Equipment Setup for BOOST Mode

NOTE:

MONITOR VHIGH ACROSS

C54 OR C61 FOR ACCURATE

EFFICIENCY MEASUREMENTS.

NOTE:

MONITOR VLOW ACROSS

C72 OR C66 FOR ACCURATE

EFFICIENCY MEASUREMENTS.

–

IHIGH

ILOW

PLACE SW1 IN BOOST POSITION

VLOW

VHIGH

+–

dc2886a F02

LOAD

–

VLOW

SUPPLY

QUICK START PROCEDURE

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

Constant-Current (CC) Mode

The DC2886A can operate as a constant-current source

when operating either as a buck or a boost. There are the

setup instructions.

1. For buck operation, setup DC2886A as shown in

Figure 1. For boost operation, setup DC2886A as

shown in Figure2. The load will need to have a con-

stant-voltage mode.

2. If the converter is setup as a buck, the CV setting for

the load should be 10V or less. If the converter is setup

as a boost, the CV setting should be 40V or less.

3. Connect a bench voltage source to the SETCUR pin as

shown in Figure4. This could be either a DC voltage

or the output of a pulse generator.

4. Monitor SETCUR, IMON and ILOW or IHIGH while adjust-

ing the SETCUR voltage. Figure16 shows an example.

For buck to boost or boost to buck transition testing,

setup the DC2886A as shown in Figure5.

QUICK START PROCEDURE

+ –

VOUT GND

COUT

Figure3. How to Measure the Output or Input Voltage Ripple

DC VOLTAGE OR

PULSE

GENERATOR

dc2886a F04

–

DMM OR

OSCILLOSCOPE

ILOW(MAX) = SETCUR/(K • RSNS) • # PHASES

GIVEN: K = 20 (ILIM = ¾ V5), RSNS = 1mΩ, # PHASES = 6

ILOW(MAX) = SETCUR • 300

IMON = ILOW/300 + 1.25V

ILOW IS POSITIVE DURING BUCK OPERATION, NEGATIVE DURING BOOST OPERATION

Figure4. Using SETCUR Pin to Control DC Current

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

External Bulk Capacitance

Additional bulk capacitance may be required across the

input for either power flow direction, especially if operating

at or near full load with supply cables longer than 2 feet.

Depending on the supply cable inductance, when operat-

ing as a boost, an extra 10mF of bulk capacitance across

VLOW may be required. When operating as a buck, an extra

1mF of bulk capacitance across VHIGH may be required.

For buck/boost transition testing, this extra capacitance

should be added across both inputs. Likely choices for

the external capacitance are either aluminum electrolytic

or super capacitors with sufficient voltage rating.

Thermal Considerations

With full continuous load on the output in either direc

tion at room temperature ambient, 400LFM of airflow

is recommended with full load. All the efficiency curves

and thermal images shown in the Typical Performance

Characteristics section were taken with this amount of

airflow from an adjustable external fan. To further aid with

thermals, the DC2886A has three optional footprints for

a board mounted heatsink and DC fan. The heatsinks are

placed at HS1–HS3 on the bottom layer underneath the

power stages for phases 1and 2, phases 3 and 4 and

phases 5 and 6. The DC fan is mounted over the heat-

sink. Terminals labeled V

FAN1

–V

FAN3

provide the fans with

power from VLOW. See Figure6 for details.

Figure5. Typical Setup for the Buck/Boost Transition Test

DC2886A

VLOW

dc2886a F05

VHIGH

GND

SETCUR

BUCK

–

E-LOAD

CV MODE

VLOW

SUPPLY

VHIGH

SUPPLY

E-LOAD

CV MODE

PULSE

GENERATOR

VSETCUR

IPROBE CLOW

~10mF

CHIGH

~1mF

QUICK START PROCEDURE

Figure6. DC2886A Optional Heatsink and Fan Mounting Assembly Drawing (Fan May Be

Powered from VLOW by Plugging Its Connector to the Terminals Labeled VFAN1 to VFAN3)

4–40 × 3/8” STANDOFF

4–40 × 1/2” SCREW

4–40 ×3/8” SCREW INSULATING WASHER

HEATSINK

60mm ×10mm FAN

INSULATING WASHER

PCB

COMPONENTS

THERMALLY CONDUCTIVE

INSULATION

SUGGESTED COMPONENTS:

FAN: DELTA ELECTRONICS EFB0612HHA

HEATSINK: AAVID THERMALLOY 241204B92200G

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

SPI Interface

To control or monitor the DC2886A from QuikEval on a

host computer, follow these steps:

1. Refer to Figure7.

2. If QuikEval is already installed, download the latest

software by selecting Tools →Update Program. If

QuikEval is not installed, then click on this link.

3. Connect J6 of the DC2886A to a DC2026C with a 14-pin

ribbon cable.

4. Connect the DC2026C to the host computer with a

USBcable.

QUICK START PROCEDURE

5. Refer to the demo manual of the DC2026C for further

details.

6. Apply a voltage within the specified input range to

either VHIGH or VLOW depending on the direction of

power flow.

7. Start QuikEval on the host computer.

8. Use QuikEval to monitor and control the LTC7871. The

LTC7871 QuikEval GUI is shown in Figure8. The dash-

board is on the left and an optional design tool is on

the right.

a. To read the status, either press the Read Once button

or the Read Continuously button in the dashboard.

Figure7. Connecting the DC2886A to a Host Computer (Refer to DC2026C Demo Manual for More Details)

Figure8. LTC7871 QuikEval GUI (Design Tool Only Available When Enabled from the File Menu)

14-PIN

RIBBON

CABLE

USB

CABLE DC2026C*

(Linduino ONE)

HOST

COMPUTER/

QuikEval

dc2886a F07

DC2886A

NOTES:

POWER MUST BE APPLIED TO VLOW OR VHIGH

TO ALLOW COMMUNICATION BETWEEN THE

DC2886A AND THE DC2026C.

*THE DC2886A COULD BE CONNECTED TO EITHER

THE DC2026C OR DC590B, BUT THE DC2026C

IS PREFERRED FOR FUTURE USE.

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

b. QuikEval can margin VLOW, VHIGH and the DC ILOW

current limit up or down by writing to the register

which controls the current source digital to ana-

log converter (IDAC) for the VFB

LOW

, VFB

HIGH

SETCUR pins. To use this feature, make sure the

Read Continuously button is not enabled. This but-

ton is gray when not enabled.

c. An optional design tool can be enabled from the

File menu. It calculates the required IDAC value to

margin the V

LOW

, V

HIGH

or DC I

LOW

current limit

to a given value. To use this tool, enter the values

for the feedback divider or SETCUR resistor and

then enter the value for the desired VLOW, VHIGH

or IL(MAX) which is the DC ILOW current limit. The

design tool will then provide the calculated IDAC

value. To update the LTC7871’s registers, enter the

calculated IDAC values in the dashboard and then

press the respective Update button.

QUICK START PROCEDURE

TYPICAL PERFORMANCE CHARACTERISTICS

LOAD CURRENT (A)

EFFICIENCY (%)

100

100 18060 140

dc2886a F09

20080 16040 12020

AIRFLOW = 400LFM

30VHIGH

48VHIGH

70VHIGH

VLOW = 14V

LOAD CURRENT (A)

EFFICIENCY (%)

100

100 18060 140

dc2886a F10

20080 16040 12020

AIRFLOW = 400LFM

VLOW ADJUSTED THROUGH

SPI INTERFACE

14VLOW

12VLOW

10VLOW

VHIGH = 48V

LOAD CURRENT (A)

EFFICIENCY (%)

100

25 4515 35

dc2886a F11

50 5520 4010 305

14VLOW

12VLOW

10VLOW

AIRFLOW = 400LFM

VHIGH = 48V

LOAD CURRENT (A)

EFFICIENCY (%)

100

25 4515 35

dc2886a F12

50 5520 4010 305

40VHIGH

48VHIGH

56VHIGH

AIRFLOW = 400LFM

VHIGH ADJUSTED THROUGH

SPI INTERFACE

VLOW = 12V

|ILOW| (A)

POWER LOSS (W)

0100 18060 140

dc2886a F13

20080 16040 12020

AIRFLOW = 400LFM

ILOW+(BUCK)

ILOW–(BOOST)

BOOST

BUCK

Figure9. Efficiency While Operating

as a BUCK, Input Voltage Varied,

Converter Setup for FCM, External

Fan Is Used

Figure10. Efficiency While

Operating as a BUCK, Output Voltage

Varied, Converter Setup for FCM,

External Fan Is Used

TA= 25°C, unless otherwise noted.

Figure11. Efficiency While

Operating as a BOOST, Input

Voltage Varied, Converter Setup for

FCM, External Fan Is Used

Figure12. Efficiency While

Operating as a BOOST, Output

Voltage Varied, Converter Setup for

FCM, External Fan Is Used

Figure13. Buck vs Boost Power

Loss Comparison, VHIGH = 48V,

VLOW = 14V, External Fan Is Used

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

TYPICAL PERFORMANCE CHARACTERISTICS

dc2886a F14

AIRFLOW

VHIGH

VLOW

PH6

PH1

dc2886a F15

AIRFLOW

VHIGH

VLOW

PH6

PH1

dc2886a F16

IMON

200mV/DIV

SETCUR

200mV/DIV

VLOW

10V/DIV

ILOW

50A/DIV

50A

1.28V

10A

Boost–to–Buck Transition

50µs/DIV

BUCK

5V/DIV

dc2886a F17

VLOW

2V/DIV

5A/DIV

VHIGH

2V/DIV

VSW

100V/DIV

Figure14. Thermal Image While Operating as a BUCK,

VHIGH = 48V, VLOW = 14V, Load = 180A, Airflow = 400LFM,

External Fan Is Used, DRVCC = 10V, fSWITCH = 150kHz

Figure15. Thermal Image While Operating as a BOOST,

VLOW = 14V, VHIGH = 48V, Load = 51A, Airflow = 400LFM,

External Fan Is Used, DRVCC = 10V, fSWITCH = 150kHz

Figure16. ILOW Stepped from 10A to 50A with the SETCUR Pin

While Operating in CC BUCK Mode, VHIGH = 48V, VLOW Clamped

at 10V with Electronic Load, 2× 10mF Bulk Capacitance Across

VLOW. ILIM = Float

Figure17. Boost to Buck Transition of the DC2886A Demo Board,

ILOW = 0A, VLOW Clamped at 10V, VHIGH Clamped at 40V

DRAFT ONLY

ANALOG DEVICES CONFIDENTIAL

DEMO MANUAL DC2886A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 R7 RES., 10k , 5%, 1/10W, 0603 SAMSUNG, RC1608J103CS

YAGEO, RC0603JR-0710KL

2 1 R10 RES., 1k , 5%, 1/10W, 0603 SAMSUNG, RC1608J102CS

YAGEO, RC0603JR-071KL

3 6 R67, R400, R403, R406, R409, R412 RES., 1Ω, 1%, 1/10W, 0603 YAGEO, RC0603FR-071RL

4 1 R36 RES., 48.7k , 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4872V

VISHAY, CRCW060348K7FKEA

5 6 R39, R40, R43, R49, R93, R103 RES., 1.5k , 1%, 1/10W, 0603 NIC, NRC06F1501TRF

VISHAY, CRCW06031K50FKEA

6 8 R18, R123, R398, R399, R402,

R405, R408, R411

RES., 100k , 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1003TRF

PANASONIC, ERJ3EKF1003V

VISHAY, CRCW0603100KFKEA

7 1 R430 RES., 12.7k , 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1272V

VISHAY, CRCW060312K7FKEA

8 6 RS1, RS2, RS3, RS4, RS5, RS6 RES., 0.001Ω, 1%, 1W, 2512, METAL, SENSE,

AEC-Q200

VISHAY, WSL25121L000FEA

9 5 R8, R9, R418, R428, R469 RES., 10k , 1%, 1/10W, 0603, AEC-Q200 KOA SPEER, RK73H1JTTD1002F

PANASONIC, ERJ3EKF1002V

VISHAY, CRCW060310K0FKEA

VISHAY, CRCW060310K0FKEB

10 2 R454, R455 RES., 0.01Ω, 1%, 1/2W, 1210, SENSE, AEC-Q200 YAGEO, RL1210FR-070R01L

11 1 R431 RES., 499k , 1%, 1/8W, 0805, AEC-Q200 NIC, NRC10F4993TRF

PANASONIC, ERJ6ENF4993V

VISHAY, CRCW0805499KFKEA

12 1 R29 RES., 2.2Ω, 1%, 1/4W, 1206, AEC-Q200 VISHAY, CRCW12062R20FKEA

13 1 R44 RES., 37.4k , 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ-3EKF3742

PANASONIC, ERJ3EKF3742V

VISHAY, CRCW060337K4FKEA

14 1 R1 RES., 3.01MΩ, 1%, 1/8W, 0805, AEC-Q200 VISHAY, CRCW08053M01FKEA

15 1 R2 RES., 210k , 1%, 1/8W, 0805, AEC-Q200 VISHAY, CRCW0805210KFKEA

16 6 R31, R32, R53, R65, R97, R98 RES., 16.9k , 1%, 1/8W, 0805, AEC-Q200 STACKPOLE ELECT., INC., RMCF0805FT16K9

VISHAY, CRCW080516K9FKEA

17 6 R419, R420, R421, R422, R423,

R424

RES., 10Ω, 1%, 1/10W, 0603 NIC, NRC06F10R0TRF

PANASONIC, ERJ3EKF10R0V

ROHM, MCR03EZPFX10R0

VISHAY, CRCW060310R0FKEA

YAGEO, RC0603FR-0710RL

18 1 R11 RES., 3.01k , 1%, 1/10W, 0603 VISHAY, CRCW06033K01FKEA

YAGEO, RC0603FR-073K01L

19 1 R17 RES., 30.1k , 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF3012V

VISHAY, CRCW060330K1FKEA

20 39 R19, R397, R401, R404, R407,

R410, R413, R426, R429, R432,

R433, R434, R435, R436, R437,

R442, R443, R444, R445, R446,

R447, R448, R449, R450, R451,

R452, R453, R467, R468, R470,

R471, R472, R473, R474, R475,

R476, R477, R478, R479

RES., 0Ω, 1/10W, 0603 BOURNS, CR0603-J/-000ELF

VISHAY, CRCW06030000Z0EAC

YAGEO, RC0603FR-070RL

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