Analog Devices DC2881A-A Manuale utente

DEMO MANUAL DC2881A-A

Rev. 0

DESCRIPTION

LTC7050/LTC3884-1

2-Phase, Dual-Output Synchronous Buck

Converter with Power System Management

Demonstration circuit 2881A-A is a 2-phase dual-output,

high efficiency, high density, synchronous buck converter

with 7V to 14V input range. Each output can supply up

to 30A maximum load current with 1V output. The demo

board features the LT C

3884-1controller paired with the

LTC7050 dual smart power stage to provide a 2-phase

buck converter solution. The LTC3884-1 is a dual output

poly phase step-down controller with digital power sys-

tem management. The LTC7050 is a dual monolithic smart

power stage which integrates high speed drivers with low

resistance half-bridge power switches plus comprehensive

monitoring and protection circuitry in an electrically and

thermally optimized package. Please refer to the LTC3884-1

and LTC7050 data sheet for more detailed information.

DC2881A-A powers up to default settings and produces

power based on configuration resistors (or with the

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

BOARD PHOTO

setting in its non-volatile memory) without the need for

any serial bus communication. This allows easy evalua-

tion of the DC/DC converter. To fully explore the extensive

power system management features of the part, download

the GUI software LTpowerPlay

onto your PC and use

ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to

the board. LTpowerPlay allows the user to reconfigure the

part on the fly and store the configuration in EEPROM, view

telemetry of voltage, current, temperature and fault status.

GUI Download

The software can be downloaded from here.

For more details and instructions of LTpowerPlay, please

refer to LTpowerPlay Quick Start Procedure.

Design files for this circuit board are available.

Figure1. Dual-Output LTC7050 + LTC3884-1/DC2881A-A Demo Circuit

DEMO MANUAL DC2881A-A

Rev. 0

QUICK START PROCEDURE

DC2881A-A is easy to set up to evaluate the performance

of LTC7050 and LTC3884-1. Refer to Figure2 for the

proper measurement equipment setup and follow the

procedure below.

1. With power off, connect the input power supply (7-14V)

to VIN (J1) and GND (J2).

2. Connect the 1.0V output load (Initial load:no load)

between VOUT1 (J5) and GND (J6).

3. Connect the 1.0V output load (Initial load:no load)

between VOUT2 (J3) and GND (J4).

4. Connect the DMMs to the input and outputs. Set default

jumper position:

• JP1: ON

• JP6: 1.5V

• JP7: ON

• JP9: ON

• JP19: ON

• JP20: ON

The dual outputs can be configured to run separately or

together as a single output. The dynamic load is con-

nected to channel 1 by default. It can be connected to

channel 2 by changing R196 and R197. Refer to page 1

of schematic for more details.

• SW1 RUN1: ON

• SW2 RUN2: ON

5. Turn on the input power supply and check for the

proper output voltages. VOUT1 should be 1V ±0.5%

and VOUT2 should be 1V ±0.5%.

6. Once the proper output voltages are established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage and other

parameters.

7. Connect the dongle and control the output voltages

from the GUI. See LTpowerPlay Quick Start Procedure

for details.

NOTE: When measuring the output or input voltage rip-

ple, do not use the long ground lead on the oscilloscope

probe. See Figure3 for the proper scope probe technique.

Short, stiff leads need to be soldered to the (+) and (–)

terminals of an output capacitor. The probe’s ground ring

needs to touch the (–) lead and the probe tip needs to

touch the (+) lead.

When doing the load transient test, it is recommended

to use a function generator to generate a pulse (~3%

duty cycle with 10Hz~100Hz frequency). Then applying

this pulse to the EXT PULSE (E7) and GND (E8) turrets.

100mV/A is the ratio of the pulse voltage amplitude over

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITION MIN TYP MAX UNITS

Input Voltage Range 7 12 14 V

Output Voltage, VOUT1/2 VIN = 7 to 14V, IOUT1/2 = 0A to 30A 0.6 1 1.8 V

Maximum Output Current, IOUT1/2 VIN = 7 to 14V, VOUT1/2 = 0.6V to 1.8V 30 A

Typical Efficiency of VOUT1/2 VIN = 12V, VOUT1/2 = 1V, IOUT1/2 = 30A 89.5 %

Default Switching Frequency 500 kHz

DEMO MANUAL DC2881A-A

Rev. 0

the load current step. The maximum load current step

achievable is typically 25A. The dynamic circuit MOSFET

is off when EXT PULSE is floating or grounded. Apply

around 30mV of initial value to EXT PULSE to make the

MOSFET open before the pulse, so that the slew rate of

load current will follow the slew rate of EXT PULSE lin-

early. Refer to the table in the schematic file to optimally

route the voltage sense points during load transient test. It

is highly recommended to monitor the load voltage using

JP21, which is Kelvin connected to C227.

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

Figure2. Proper Measurement Equipment Setup

Figure3. Measuring Output Voltage Ripple

+ –

VOUT GND

COUT

–

IIN

POWER

SUPPLY

–

VOUT2

LOAD2

IOUT2

–

VOUT1

OUT1

–

LOAD1

dc2881a-a F02

DEMO MANUAL DC2881A-A

Rev. 0

Figure4. Demo Setup with PC

USB to I2C/PMBus

DONGLE DC1613A

LTC7050 DEMO BOARD

DC2881A-A

USB CABLE VIN

12-PIN (J14)

CONNECTOR DC2881A-A F04

LOAD1

VOUT1

LOAD2

VOUT2

INPUT POWER

SUPPLY

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

Connecting a PC to DC2881A-A

You can use a PC to reconfigure the power management

features of LTC3884-1 such as:nominal VOUT, margin set

points, OV/UV limits, temperature fault limits, sequenc-

ing parameters, the fault log, fault responses, GPIOs

and other functionalities. The DC1613A dongle may be

plugged when VIN is present.

Efficiency measurement

Headers JP12 – JP16 are kelvin connected close to the

power stage for ideal efficiency measurement. For total

VOUT1/2 rail efficiency, including controller and SPS bias

conversion losses, use the setup shown in Figure5. Check

the following setup before measurement:

• JP 20 removed

• Bleeder resistors R85 and R200 removed

•Resistors R196 and R197 removed

To measure the efficiency of LTC7050, refer to the setup

in Figure6. In this setup, the controller, SPS, and IREF

biases are provided externally so as to not load the 12V

input. Additionally, the SPS bias power loss from the

external power source is added to the efficiency calcula-

tion as shown below.

η=

OUT

•I

OUT

VIN •IIN+(V

DRV •IDRV )

Optionally, FILTERED SW1 (JP12) can be used as the VOUT

measurement to obtain efficiency of just the SPS (without

inductor losses). JP12 is connected to the switching node

of channel 1 through a filter composed of R173 and C26

to obtain the average voltage at the switch node. Check

the following setup before measurement:

• JP19 and JP 20 both removed

• JP7 set to OFF

• JP9 set to OFF and JP6 removed

• Bleeder resistors R85 and R200 removed

•Resistors R196 and R197 removed

• R167 and R168 removed

•Apply a 5V power supply between turrets of E35 and

E36 for driving power. Measure the voltage and the

current for driving power loss.

•Apply a 5V power supply between turrets of E39 and

E36 for controller power.

•Apply a 1.5V power supply between turrets of E40 and

E41 for IREF voltage.

DEMO MANUAL DC2881A-A

Rev. 0

Figure5. Measuring Setup for DC2881 Efficiency

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

POWER

SUPPLY

–

OUT1

–

LOAD1

VOUT1

IN1

+–

dc2881a-a F05

DEMO MANUAL DC2881A-A

Rev. 0

Figure6. Measuring Setup for LTC7050 Efficiency

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

VOUT1

IN1

+–

IIN

POWER

SUPPLY

–

OUT1

–

LOAD1

POWER

SUPPLY

+ –

POWER

SUPPLY

POWER

SUPPLY +

–

DRV

IDRV

–

dc2881a-a F06

DEMO MANUAL DC2881A-A

Rev. 0

Figure9. VOUT1 Load Transient Response at VIN = 12V, VOUT1 = 1V Figure10. VOUT2 Load Transient Response at VIN = 12V, VOUT2 = 1V

Figure7. DC2881 Efficiency vs. Load Current on VOUT1/2

DC2881 VOUT1/2 Efficiency vs Load at

VIN = 12V, fS= 500kHz, 1-Phase

Figure8. LTC7050 Efficiency vs. Load Current on VOUT1/2

LTC7050 VOUT1/2 Efficiency vs Load at

VIN = 12V, fS= 500kHz, 1-Phase

OUT

= 1V

OUT

= 1.8V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2881a-a F07

L: PA2607.211NL

215nH, 0.29mΩ

L: PA2607.211NL

215nH, 0.29mΩ

OUT

= 1V

OUT

= 1.8V

LOAD CURRENT (A)

100

EFFICIENCY (%)

dc2881a-a F08

100µs/DIV

dc2881a-a F10

OUT2

(20MHz BW)

20mV/DIV

OUT2

0A TO 7.5A, 7.5A/µs

5A/DIV

100µs/DIV

dc2881a-a F09

OUT1

(20MHz BW)

20mV/DIV

OUT1

0A TO 7.5A, 7.5A/µs

5A/DIV

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

DEMO MANUAL DC2881A-A

Rev. 0

Figure11. VOUT1 Voltage Ripple = 17.4mV at

VIN = 12V, VOUT1 = 1V, IOUT1 = 30A

Figure12. VOUT2 Voltage Ripple = 17.4mV at

VIN = 12V, VOUT2 = 1V, IOUT2 = 30A

Figure13. Thermal at VIN = 12V, VOUT1 = 1V, IOUT1 = 30A, VOUT2 = 1V, IOUT2 = 30A, TA= 22°C, No Airflow

2µs/DIV

OUT1

(20MHz BW)

20mV/DIV

dc2881a-a F11

2µs/DIV

OUT2

(20MHz BW)

20mV/DIV

dc2881a-a F12

OUTPUT AND ONBOARD E-LOAD CONFIGURATION

DEMO MANUAL DC2881A-A

Rev. 0

LTpowerPlay SOFTWARE GUI

Figure14. LTpowerPlay Main Interface

LTpowerPlay is a powerful Windows based development

environment that supports Analog Devices power sys-

tem management ICs and µModules, including LTM4675,

LTM4676, LTM4677, LTM4678, LTM4680, LTM4700,

LTC3880, LTC3882, LTC3883, LTC3884 and LTC3888-1.

The software supports a variety of different tasks. You

can use LTpowerPlay to evaluate Analog Devices ICs by

connecting to a demo board system. LTpowerPlay can

also be used in an offline mode (with no hardware pres-

ent) in order to build a multichip configuration file that

can be saved and reloaded at a later time. LTpowerPlay

provides unprecedented 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 DC1613A USB-to-I2C/

SMBus/PMBus controller to communicate with one of

many potential targets, including LTM4675, LTM4676,

LTM4677, LTM4678, LTM4680, LTM4700, LTC3880,

LTC3882, LTC3883, LTC3884 and LTC3888-1’s 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 here.

To access technical support documents for ADI’s

Digital Power System Management Products, visit the

LTpowerPlay Help menu.

DEMO MANUAL DC2881A-A

Rev. 0

The following procedure describes how to use LTpowerPlay

to monitor and change the settings of LTC3884-1.

1. Download and install the LTpowerPlay GUI from here.

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC2881A-A.

The system tree on the left hand side should look like this:

b. A green message box shows for a few seconds in the

lower left-hand corner, confirming that LTC3884-1 is

communicating:

c. In the Toolbar, click the R (RAM to PC) icon to read the

RAM from the LTC3884-1. This reads the configuration

from the RAM of LTC3884-1 and loads it into the GUI.

d. If you want to change the output voltage to a different

value, like 1.2V. In the Config tab, type in 1.2 in the

VOUT_COMMAND box, like this:

Then, click the W (PC to RAM) icon to write these reg-

ister values to the LTC3884-1. After finishing this step,

you will see the output voltage will change to 1.2V.

LTpowerPlay QUICK START PROCEDURE

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