TDA7481 datasheet(3/6 Pages) STMICROELECTRONICS

3 / 6 page

ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VCC =

±18V; RL = 8Ω; RS = 50Ω;

RF = 12K

Ω; Demod.. filter L = 60µH, C = 470nF; f = 1KHz; Tamb = 25°‘C unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Supply Range

±10

±25

Total Quiescent Current

RL =

∞, no LC filter

VOS

Output Offset Voltage

PLAY condition

–70

-30

Output Power

THD = 10%

THD = 1%

Output Power

VCC =

±15V; RL = 4Ω

THD = 10%

THD = 1% (*)

Maximum Dissipated Power

VCC =

±18V; RL = 8Ω; Rf = 12KΩ

PΟ = 18W THD 10%

3.5

Efficiency

≡

+ PD

≡

(**)

VCC =

±18V; RL = 8Ω; Rf = 12KΩ

PΟ = 18W THD 10%

THD

Total Harmonic Distortion

RL = 8

Ω; PO = 1W

0.1

Imax

Overcurrent Protection

Threshold

RL = 0

3.5

Thermal Shut-down Junction

Temperature

150

°C

Closed Loop Gain

Total Input Noise

A Curve

f = 20Hz to 22KHz

µV

VCCTOT MAX

Maximum Total VCC Protection

Input Resistance

Ω

SVR

Supply Voltage Rejection

f = 100Hz; Vr = 0.5

Tr, Tf

Rising and Falling Time

RDSON

Power Transistor on Resistance

0.4

Ω

FSW-OP

Switching Frequency Operative

Range

100

200

KHz

FSW

Switching Frequency

100

120

140

KHz

Zero Signal Frequency

Constant (***)

1.4x10

Ω

Frequency Controller Resistor

Range (****)

712

Ω

MUTE & STAND-BY FUNCTIONS

VST-BY

Stand-by range

0.8

VMUTE

Mute Range

1.8

2.5

VPLAY

Play Range (1)

AMUTE

Mute Attenuation

IqST-BY

Quiescent Current @ Stand-by

*: The output LC filter must be changed to: L = 30

µH; C = 1µF

**: PO = measured across the load using the following inductor:

COIL 58120 MPPA2 (magnetics)

TURNS: 28

∅ 1mm

***: The zero-signal switching frequency can be obtained using the following expression: FSW = BF/RF

****: The maximum value of RF is related to the maximum possible value for the voltage drop on RF itself

(1) for V10 >5.2V, an input impedance of 10K

Ω is to be considered

TDA7481

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