SHUTDOWN

CONTROL

AUDIO

INPUT A

AUDIO

INPUT B

4.7 PF

0.39 PF

0.39 PF

BIAS

VOLUME

VOLUME

BYPASS

SHUTDOWN

2

3

9

8

V

DD

6

5

4:

7

1

0V - 3.3V

470 PF

DC-VOL

+

-

DC-

CONTROLLED

VOLUME

CONTROL

+

-

470 PF

4:

4

COUT

A

COUT

B

CIN

A

S

CIN

B

-VIN

A

-VIN

B

R

L

R

L

AMP

B

AMP

A

C

S

VOUT

B

VOUT

A

10 PF

LM4952

SNAS230A – AUGUST 2004 – REVISED MAY 2013

www.ti.com

APPLICATION INFORMATION

HIGH VOLTAGE BOOMER WITH INCREASED OUTPUT POWER

Figure 40. Typical LM4952 SE Application Circuit

Unlike previous 5V Boomer amplifiers, the LM4952 is designed to operate over a power supply voltages range of

9.6V to 16V. Operating on a 12V power supply, the LM4952 will deliver 3.8W into a 4

Ω SE load with no more

than 10% THD+N.

POWER DISSIPATION

Power dissipation is a major concern when designing a successful single-ended or bridged amplifier. Equation 1

states the maximum power dissipation point for a single-ended amplifier operating at a given supply voltage and

driving a specified output load.

Single Ended

(1)

The LM4952's dissipation is twice the value given by Equation 1 when driving two SE loads. For a 12V supply

and two 4

Ω SE loads, the LM4952's dissipation is 1.82W.

The maximum power dissipation point given by Equation 1 must not exceed the power dissipation given by

Equation 2:

(2)

Equation 2 to find the maximum internal power dissipation supported by the IC packaging. Rearranging

temperature that still allows maximum stereo power dissipation without violating the LM4952's maximum junction

temperature.

12

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