UTCTDA2030 LINEAR INTEGRATED CIRCUIT

13

QW-R107-004,B

SHORT CIRCUIT PROTECTION

The UTC TDA2030 has an original circuit which limits the current of the output transistors. This function can be

considered as being peak power limiting rather than simple current limiting. It reduces the possibility that the device

gets damaged during an accidental short circuit from AC output to Ground.

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 above limit ambient temperature can be easily supported

since the Tj can not be higher than 150

°C

2).The heatsink can have a smaller factor of safety compared with that of a congenital circuit, There is no possibility

of device damage due to high junction temperature increase up to 150, the thermal shut-down simply reduces the

power dissipation and the current consumption.

APPLICATION SUGGESTION

The recommended values of the components are those shown on application circuit of Fig.14. Different values can

be used. The following table can help the designer.

COMPONENT

RECOMMENDED

VALUE

PURPOSE

LARGE THAN

RECOMMENDED

VALUE

LARGE THAN

RECOMMENDED

VALUE

R1

22K

Ω

Closed loop gaon

setting.

Increase of Gain

Decrease of Gain

R2

680

Ω

Closed loop gaon

setting.

Decrease of Gain

Increase of Gain

R3

22K

Ω

Non inverting input

biasing

Increase of input

impedance

Decrease of input

impedance

R4

1

Ω

Frequency stacility

Danger of oscillation

at high frequencies

with inductive loads.

R5

≈3R2

Upper frequency

cutoff

Poor high frequencies

attenuation

Dange of oscillation

C1

1

µF

Input DC decoupling

Increase of low

frequencies cutoff

C2

22

µF

Inverting DC

decoupling

Increase of low

frequencies cutoff

C3,C4

0.1

µF

Supply voltage

bypass

Dange of oscillation

C5,C6

100

µF

Supply voltage

bypass

Dange of oscillation

C7

0.22

µF

Frequency stability

Larger bandwidth

C8

≈1/(2π*B*R1)

Upper frequency

cutoff

smaller bandwidth

Larger bandwidth

D1,D2

1N4001

To protect the device

against output voltage

spikes.