Crown POWER BASE 1 Service Manual download pdf (Page 12)

Power Base-1 & 460CSL Amplifier Service Manual

Theory

±ODEP circuitry is used to simulate the thermal barri-

ers between the interior of the output device die

(immeasurable by normal means) and the time delay

from heat generation at the die until heat dissipates to

the thermal sensor. The combined effects of thermal

history and instantaneous dynamic power level result

in an accurate simulation of the actual thermal condi-

tion of the output transistors.

NEGATIVE

LOW SIDE

OUTPUT

PNP STAGE

POSITIVE

LOW SIDE

OUTPUT

NPN STAGE

NEGATIVE

HIGH SIDE

OUTPUT

PNP STAGE

POSITIVE

HIGH SIDE

OUTPUT

NPN STAGE

HIGH SIDE

BIAS

SERVO

+LVA

-1

-LVA

-1

+VOLTAGE

TRANSLATOR

-VOLTAGE

TRANSLATOR

OUTPUT

DEVICE

EMULATION

PROTECTION

ERROR

AMP

VGSBGS

BALANCED

INPUTS

INVERTING

BRIDGE

BALANCE

LOW SIDE

BIAS

DIODE

STRING

-1

MAIN NEGATIVE FEEDBACK (NFb) LOOP

Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown)

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 41 42

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Crown POWER BASE 1 Service Manual Page 12

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