TDA2003

Inductive load

A protection diode is provide between pin 4 and pin 5(see the internal schematic diagram)

to allow use of the TDA 2003 with inductive lo ads. In particular, the TDA 2003 can drive a

coupling transformer for audio modulation.

DC voltage

The maximu m operating DC voltage on the TDA 2003 is 18V.

However the device can withstand a DC voltage up to 28V with no damage. This could

occur during winter if two batteries were series connected to crank the engine.

Thermal shut-down

The presence of a thermal limiting circuit offers the following advantages:

(1).an overload on the output (even if it is permanent),or an excessive ambient temp erature

can be easily withstood.

(2).the heat-sink can have a smaller factor comp ared with that of a conventional circuit.

There is no device damage in case of excessive junction temp erature: all that happens is

that Po( and there Ptot) and Id are reduced.

APPLICATION SUGGESTION

The recommended values of the components ar e those shown on application circuit of

Ty pical application circuit. Different values can be used .the following table can help the

designer.

Component

Recomme nded

Value

Purpose

Smaller than

recommended

Value

Large than

recommended

Value

R1

(Gv-1)*R2

Gain setting

Increase of gain

R2

2.2

Ω

Gain and SVR setting

D ecrease of SVR

R3

1

Ω

Frequency stability

Danger of

Oscillation at high

frequency with

inductive loads.

Rx

=20*R2

Upper frequency cut

off

Poor high frequencies

attenuation

Danger of

oscillation

C1

2.2

µF

Input DC decoupling

Noise at switch-on

switch-off

C2

470

µF

Ripple rejection

Decrease of SVR

C3

0.1

µF

Supply voltage by

pass

Danger of

oscillation

C4

1000

µF

Supply voltage by

pass

Higher low

frequency cut off