TDA2003

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

7 of 10

www.unisonic.com.tw

QW-R107-002,F

BUILT-IN PROTECTION SYSTEMS(Cont.)

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 temperature can be easily withstood.

(2) The heat-sink can have a smaller factor compared with that of a conventional circuit. There is no device damage

COMPONENTS USAGE SUGGESTION

The recommended values of the components are those shown on typical application circuit Different values can

be used. The following table can help the designer.

COMPONENT RECOMMENDED

VALUE

PURPOSE

LARGE THAN

RECOMMENDED VALUE

SMALLER THAN

RECOMMENDED VALUE

R1

(Gv-1)*R2

gain setting.

increase of drain current

R2

2.2

Ω

gain and SVR setting.

Decrease of SVR

R3

1

Ω

Frequency stability

Danger of oscillation at high

frequencies with inductive

loads.

Rx

≈20R2

Upper frequency cutoff

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 bypass

Danger of oscillation

C4

1000

μF

Supply voltage bypass

Higher low frequency

cutoff

C5

0.1

μF

Frequency stability

Danger of oscillation at

high frequencies with

inductive loads.

Cx

≈1/(2π*B*R1)

Upper frequency cutoff

Lower bandwidth

Larger bandwidth