Crown Macro-Tech MA-5000VZ Owner's Manual download pdf (Page 17)

wíth

the

power

signal,

drives

the

ODER

amplifier U112A.

The RC

network

in the

feedback path

of

U112A

models

the

thermal

junctions

from

output

devíce

die to

housing,

housing

to

case,

and

caseto heatsink

under

both static

and

dynamic conditions.

The

output

of the

posrtive

ODER

amplifier drives +ODEP

test

point

pin

11.

Italso

drives U114A

and

U114B which

in

turn drive

-LH and +LL

respectively.

The

output

of the

negative

ODER

amplifier drives

the

ODER

indicatíon

circuitry

and

-ODER

test point

pin 9.

Negative

ODER

also

drives

U114C

and

U114D which

in

turn drive

+LH and -LL

respectively.

Also

entering

the

U114

comparator networks

are the PWR

(power relay

engage),

PWRLOSS (brown-ouí),

and

FAULT (any protection which

shuts down

the

amplifier)

signáis

via

blocking diodes.

If

any of

these

signáis drop

low

the

f

eed to LS

bias

and

Voltage

Translator drive

will

be

shut down

via ±LL and

±LH. This action

mutes

all

audio

in the

event

of

a

dramatic

failure.

Notes

-ODER

Output:

+

12V

Cold

-9V

Hot

This circuit

is

essentially

the

"resulí"

of

ODER,

its

output.

±LH

control Voltage Translator

current;

±LL

control

Low

Stde

Bias current.

±LL7LH

volíages

will also

be

activated

by the

FAULT

circuit,

the

"brown-out"

Power

Loss

circuit,

or any

time

the

main

power relays

are not

closed.

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