UTCTDA2003 Datasheet, PDF (8/8 Pages) Unisonic Technologies – 10W CAR RADIO AUDIO AMPLIFIER

UTCTDA2003 LINEAR INTEGRATED CIRCUIT
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 in
case of excessive junction temperature: all that happens is that Po ( and there Ptot) and Id are reduced.
APPLICATION SUGGESTION
The recommended values of the components are those shown on application circuit of Fig.16. Different values can be
used. The following table can help the designer.
COMPONENT
R1
R2
R3
Rx
C1
C2
C3
C4
C5
Cx
RECOMMENDED
VALUE
(Gv-1)*R2
2.2π
1Ω
≈20R2
2.2µF
470µF
0.1µF
100µF
0.1µF
≈1/(2π*B*R1)
PURPOSE
gain setting.
gain and SVR
setting.
Frequency stability
Upper frequency
cutoff
Input DC decoupling
Ripple rejection
Supply voltage
bypass
Supply voltage
bypass
Frequency stability
Upper frequency
cutoff
LARGE THAN
RECOMMENDED
VALUE
Decrease of SVR
Danger of oscillation
at high frequencies
with inductive loads.
Poor high frequencies
attenuation
smaller bandwidth
LARGE THAN
RECOMMENDED
VALUE
increase of Gain
Dange of oscillation
Noise at switch-on
switch-off
Decrease of SVR
Dange of oscillation
Higher low frequency
cutoff
Danger of oscillation
at high frequencies
with inductive loads.
Larger bandwidth
UTC UNISONIC TECHNOLOGIES CO., LTD. 8
QW-R107-002,A