Infinity DPA 275 Manual de programación

Winfini

CAR

AUDIO

DPA

275/250

Digital

Power

Amplifier

Owner’s

Manual

Installation

Guide

Owner’s

Manual

and

Installation

Guide

FEATURES...

HPDA

CONVERTERS

HiGH

EFFICIENCY

Introduction

INTRODUCTION

The

Infinity

DPA

275/250

Digital

Power

Amplifier

breakthrough

innovation

for

the

mobile

audio

after-market.

You

now

own

digital

amplifier

that

car

audio

enthusiasts

everywhere

have

only

dreamed

—

until

now!

The

DPA

275/250

the

generation

amplification,

and

makes

all

other

mobile

amplifier

technologies

obsolete.

The

DPA

275

offers

stereo,

bridged-mono,

tri-

mode

operation,

and

delivers

watts

(rms)

per

channel

into

4-ohm

load.

The

DPA

250

produces

watts

(rms)

per

channel

operating

stereo.

Otherwise,

both

models

come

with

these

features:

Our

innovative

Differential

Amplification

Output

Switching

the

design

essence

this

product

HPDA

(High

Power

Digital-to-Analog)

Converter

each

channel

directly

convert

digital

signals

into

amplified

analog

audio

waveforms

Custom-Designed

High-Speed

MOSFET

Switching

Power

Supply

supply

voltages

for

internal

circuits

Five

protection

levels

guard

against

Over-Voltage,

Under-Voltage,

Over-Power,

Over-Temperature,

and

Over-Current

situations

High

efficiency

requires

far

less

electrical

power

and

generates

smaller

amount

heat

Small

footprint

when

compared

conventional

Class

amplifiers

with

equivalent

power

ratings

Amplifier

input

sensitivity

control

—

match

wide

range

input

signal

levels

The

DPA

275

has

bass

equalization

control

provide

bass

boost

Color-keyed,

industrial-grade,

gold-plated

connections

—

easy-to-install

high-quality

interface

Connection

cover

defeats

tampering

with

installation

wiring

Rugged,

sleek-looking

case

—

built

for

the

road,

yet

still

showpiece

SOlnfinity

Asout

THIS

MANUAL...

PPA:

207

20:0

This

Infinity

product

made

with

our

ongoing

dedication

create

the

best

consumer

audio

products

possible.

result,

you

can

expect

your

DPA

275/250

Digital

Power

Amplifier

provide

you

with

many

years

listening

enjoyment.

Save

these

instructions

for

future

reference.

All

Infinity

Automotive

Products

carry

limited

one-

year

parts

and

labor

warranty,

retain

the

bill

sale

protect

your

purchase

the

unlikely

event

failure

during

the

warranty

period.

attain

maximum

amplifier

performance,

encourage

you

read

the

remaining

pages

before

installing

and

operating

the

Infinity

DPA

275/250

Digital

Power

Amplifier.

Since

this

product

such

radical

departure

from

any

other

amplifier

available

today,

we’ve

devoted

the

section

Technical

Overview,

you

can

understand

what's

going

inside

the

chassis.

TABLE

CONTENTS

TECHNICAL

OVERVIEW....cccccoceccccccccssccseessened

DESIGNING

WASNT

EASY....cccccccccvevcccscscend

HiGH-SPEED

MOSFET

POWER

SUPPLY....ccscsees

NEW

DIGITAL

TECHNOLOGY

..cccccscccccscsccsscceses@

[APPLICATIONS

cccccsssscessesesececcscccseseessereersase®

STEREO:

SYSTEM

cecssaccscecccdsustcienncasvassestessonsc®

BRIDGED-MONO

(DPA

275

ONLY)

.cccccsssseseee

TRI-MODE

(DPA

275

ONLY)....cccsscccorsvesenes

PRECAUTIONS

AND

NOTES.......cccscccsssccssveel

INSTALLATION

.....ccssccccccssscccccscccccessscsscccssest

PARTS:

EIST

ccccvscscssccsdcnccsexsaateacastdeasscescccielo

MOUNTING

cocseciscccictsccescescccteecetaccieusaesissclo

WIRING

sessccccaseicsccacévaveuescudanscacensncsccucese

SETTING

INPUT

SENsiTIviTY

AND

BAss

EQ......15

INSTALLING

THE

COVER....cccscccscssnescreccsenscceel@

CASE

TROUBLE.

..cosccovscccvccescccssessoeseselO

SPECIFICATIONS

eas

bdeuadceuwaseeaeseneseccaseackeonslh

Table

Contents

Owner’s

Manual

and

Installation

Guide

TECHNICAL

OVERVIEW

DESIGNING

Creating

digital

car

amplifier

small

feat.

fact,

we've

devoted

the

equivalent

over

5000

man-

WASN’T

EASY...

hours

developing

and

testing

prototypes

come

with

the

unique

design

used

the

Infinity

DPA

Digital

Power

Amplifier.

Along

every

step

the

way,

gained

insight

about

how

solve

major

design

obstacles

—

temperature

and

humidity

extremes,

widely-varying

electrical

system

voltages,

complex

load

impedances,

RFI

(radio

frequency

interference)

concerns,

and

multitude

interface

options.

result,

had

develop

several

unique

circuit

topologies

for

the

Infinity

DPA

series

amplifier,

shown

Figure

FET

Switch

Vde

Rectifiers

and

-15

Vde

Filters

Convert

125

kHz

Fnergy

Storage

Capacitors

and

RF|

Filters

Ground

+10

tat.

Vde

(from

battery)

Common

filtered

415

Vde

valtages

Vdc

FET

Switch

Controland

|--------+-----'

Remote

Turr-On

195

Khz

Clock

Over

Voltage

Sensor

Voltage

Sensor

DPA

HIGH-SPEED

ver

Power

Sensor

Over

Temperature

Sensor

MOSFET

SWITCHING

Over

Current

Sensors

POWER

SUPPLY

+35

Vde

(from

Rower

Supply]

High

Power

FET

sui

Digital-to-Analog

[HPDA]

Converter

Changes

PWM

Pulses

Modulator

Converts

Analog

Audio

Input

Analog

Audio

Voltage

Audio

Output

Pulse-Width-Modulated

Digital

Signo!

fone

channel)

[one

channel)

Tg.

NN,

Vde

{from

Power

Supply]

Feedback

DPA

DIGITAL

SWITCHING

AMPLIFICATION

Figure

DPA

series

amplifier

contains

High-Speed

MOSFET

Sunutching

Power

Supply

and

Digital

Output

Switching

Amplification

technology.

Technical

Overview

SOInfinity

DPA

2757250

HIGH-SPEED

create

the

voltages

required

the

DPA

275/250’s

internal

circuits,

designed

new

MOSFET

Power

high-speed

MOSFET

Switching

Power

Supply.

Rather

than

use

off-the-shelf

[Cs

Gintegrated

SUPPLY...

circuits),

developed

unique

voltage

doubler

circuit

that

has

constant

frequency

and

duty

cycle,

with

short

signal

path.

This

technique

produces

power

supply

with

high

percent

efficiency

rating,

regardless

normal

battery

voltage.

When

combined

with

the

other

circuits,

overall

amplifier

efficiency

percent

attained,

measured

the

ratio

power

out

the

speakers

versus

power

from

the

battery.

Why

HiGH

Before

on,

here’s

why

you

should

concerned

about

high

efficiency

rating.

Literally,

means

ErriciENCY

DPA

275/250

amplifier

will

convert

your

vehicle’s

valuable

electrical

power

into

useful

audio

IMPORTANT?

power,

than

Class

analog

amplifier

with

the

same

power

rating.

The

electrical

system

won't

strained,

and

much

less

energy

will

turned

into

wasted

heat.

Efficiency

100%

90%

DPA

275

oan

)

70%

Operating

Ronge

For

Music

See,

one

Reproduction

—

50%

conventional

amplifier

40%

30%

20%

)

100

120

140 160

Figure

Efficiency

versus

power

output

for

DPA

275

and

conventional

analog

car

amplifier

driven

dc-to-de

converter.

Technical

Overview

EFFICIENCY

AND

Music

REPRODUCTION

ADVANTAGES

HIGHER

Crock

RATE

wner’s

Manual

and

sha

lavion

Gauide

——_—__=.

Efficiencies

are

typically

measured

the

amplifier’s

full

power

rating.

However,

look

power

output

versus

efficiency

curve

shows

that

efficiency

varies

directly

function

the

power

output

level.

This

apparent

when

music

the

source,

opposed

sine

wave

test.

Figure

(on

the

opposite

page)

shows

measured

efficiencies

versus

power

output

levels

for

DPA

275

and

conventional

analog

amplifier

driven

de-

to-de

converter.

Notice

that

the

DPA

275

operated

over

percent

efficiency

over

range

watts,

resulting

very

little

wasted

energy.

other

words,

for

every

100

watts

battery

power

in,

the

DPA

275

delivered

watts

music

power

the

loudspeaker!

Moreover,

when

music

the

source,

amplifier

will

operate

approximately

one-third

its

rated

output

(in

this

case

watts).

This

exactly

where

the

DPA

275

(or

DPA

250)

most

efficient

during

the

most-used

area

operation

—

music

reproduction.

the

digital

world,

clock

circuit

which

serves

single

source

pulses

for

use

other

circuits,

and

clock

rate

the

number

pulses

that

occur

per

unit

time,

measured

Hertz.

The

DPA

275/250

power

supply

uses

higher

clock

rate

(125

kHz,

versus

kHz

typical

designs),

which

presents

several

advantages.

First,

the

size

components

and

the

accompanying

package

smaller.

This

insures

that

generated

RFI

not

audible

and

will

not

interfere

with

the

amplifier’s

switching

frequencies.

addition,

pair

asynchronous

clocks,

controlling

the

switching

circuits

the

power

amplifiers,

operate

different

frequencies

the

left

and

right

channels

eliminate

the

possibility

any

heterodyne

(1.e.,

radio

beat)

effect.

addition,

the

board’s

ground

plane

coupled

electrostatically

the

chassis,

control

virtually

all

RFI

generated

the

500

kHz

carrier

(see

page

6).

Five

protection

sensors

monitor

over-voltage,

under-

voltage,

over-power

conditions,

over-temperature

limits,

and

over-current

use.

This

unparalleled

protection

scheme

allows

the

DPA

275/250

operate

continually

over

range

battery

voltages

from

15.5

all

temperature

extremes.

Technical

Overview

Q9INfiniky

New

DIGITAL

TECHNOLOGY...

INCORPORATES

HPDA

Converters

DPA.

2757750

amplify

audio,

developed

new

technology

called

Differential

Amplification

Output

Switching.

shown

Figure

(on

page

3),

consists

proprietary

500

kHz

pulse-width

modulation

circuit,

sample

and

convert

incoming

analog

audio

digital

“1-bit”

pulses

(which

the

equivalent

11-times

oversampling

rate

digital

audio

terms).

The

high

modulation

frequency

insures

precision

sampling

that

free

audible

RFI

artifacts,

and

also

allows

use

passive,

gentle-slope

filtering

—

for

minimum

phase

shift

when

the

analog

waveform

reconstructed

the

output.

essence,

have

incorporated

High

Power

D-to-A

(HPDA)

converter

within

the

design.

The

digital

pulses

control

complementary

pair

fast,

high-current

MOSFET

switches

that

create

amplified

pulses

across

the

voltage

rails.

Two-stage

RFI

filtering

removes

the

500

kHz

carrier

frequency,

and

the

result

pure

amplified

analog

signal

that

transparent

and

adds

sound

its

own!

better

understand

how

analog

signal

extracted

from

digital

pulse-width

waveform,

refer

Figure

during

the

following

discussion.

duty

analog

PYM

duty

cycle

audio

ae.

signal

son

Figure

Duty

cycle

measurement

the

time

digital

signal

versus

the

time

off

over

one

cycle

the

waveform.

expressed

percentage

(e.g.,

duty

cycle

means

the

signal

half

the

time).

positive

voltage

increase

the

analog

audio

signal

translates

increased

duty

cycle

the

pulse-width

modulated

(PWM)

digital

signal.

echnical

Overview

———

ee...

Owner’s

Manual

and

Installation

Guide

pay

HPDA

CONVERTERS

AmpPLIFY

AND

RECONSTRUCT

THE

ANALOG

SIGNAL

Worp

Asout

LOAD

IMPEDANCES

Figure

Frequency

response

for

DPA

275

with

both

channels

driving

loads

and

ohms.

Note

the

differences

the

high

frequencies

when

compared

the

optimum

4-ohm.

response.

When

there

incoming

audio

signal,

the

modulator

circuit

creates

pulse-width

waveform

having

duty

cycle.

This

means

the

waveform

—

spends

half

its

time

+35

and

the

other

half

its

time

-35

dc.

When

you

sum

(i.e.,

average)

the

areas

under

each

positive

and

negative

excursion

(in

the

way

our

HPDA

does),

you

get

net

result

zero

—

voltage

output.

Let’s

assume

instantaneous

positive

voltage

now

present

the

analog

input,

and

the

modulator

shifts

the

duty

cycle

the

pulse-width

waveform,

time

spent

+35

than

the

-35

rail.

When

these

areas

are

averaged,

positive

value

the

output

the

net

result.

Repeating

this

process

creates

continuous

amplified

analog

waveform

from

the

stream

500

kHz

samples.

For

optimum

performance,

the

DPA

275/250

should

only

drive

4-ohm

load.

crossover

filter

design,

there

direct

result

having

specify

load

impedance

order

build

the

output

filters

used

the

HPDA

converter.

choose

ohms

the

best

compromise

between

the

most

common

values

and

ohms. Other

loads

can

used,

but

they

will

change

filter

characteristics

and

affect

the

amplifier’s

frequency

response,

shown

Figure

With

8-ohm

load,

the

DPA

275/250

response

rises

the

high

frequencies

produce

brighter

sound.

Conversely,

with

2-ohm

load,

the

high

frequency

response

rolls

off

faster

for

duller

sound.

addition,

protection

circuits

will

activate

sooner

safeguard

the

amplifier.

Level

{dB}

Frequency

(Hz)

Technical

Overview

ROinfinity

DPA

275/250

APPLICATIONS

For

your

convenience,

we've

included

several

application

diagrams

help

you

plan

your

own

installation.

Figures

through

show

how

configure

the

DPA

275

for

stereo,

bridged-mono,

tri-mode

operation.

For

the

DPA

250,

only

Figure

will

apply.

Figure

Wiring

diagrams

for

stereo

operation

DPA

275

and

DPA

250

amplifiers.

When

hooked-up

shown,

amplifier

outputs

are

phase.

DPA

275

Amplifier

Stereo

Mode

speaker

DPA

250

Amplifier

Stereo

Mode

speaker

Applications

Owner's

Manual

and

Installation

Guide

Figure

Wiring

diagram

for

operating

the

DPA

275

amplifier

bridged-mono

configuration.

this

mode,

only

the

right

channel’s

RCA

input

DPA

jack

active.

itier

Mono

Mode

subwoofer

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