Crown Macro-Tech MA-5000VZ Manuel du propriétaire télécharger pdf (Page 14)

Notes

Also

tapping

in to the

ODER

output control

of LS

bias

feed

and

Voltage

Translator feed

are

signáis

from

the

fault,

power (turn-on

delay),

and

power

loss

(brown-out) circuits.

By

using

the

output

of

ODER

for ±LL

and ±LH

control, these

sources

can

mute

the

audio

to the

ouíput

stage:

a.

until

power-up delay

has

timed

out;

b.

immediately

upon indication

of

any

failure

mode;

c. and

immediately

upon

loss

of AC

mains

(power-

down

or

actual loss

of AC

service).

±TEMP

signáis

are

produced

by

U500

and

U501

on the

output modules.

U108,

on the

main

module,

is a

buffer

which drives

the

temperature

sense

test

point.

U117A

hasafixed

window voltage

of

6.2VviaZener

D129.

If

heatsink temperature

level

exceeds about

130°C

U117A

output

will

cause both

the

positiva

and

negative

ODER

amplifiers

to go

into hard

ODER

limiting.

When

the

thermal condition clears this

ümiting

condition

will

also

clear.

+VCC enters

via

dual

PNP

transistor pack

U116.

Positive

ODER

bias

isadjustedbyR182.

The

voltage

atthat point

controls

thestatic

balance

of

the

U116

device.

U116

combines

the VCC and

output current sense

information,

the

output

of

which represents output power

level.

The

common

output

is

brought into

RN101

where

it

provides

the

reference

for

temperature

and

power. U112B

is the

active device and,

together

Positive

ODER

-15V

C130

0.1

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