TDA2003
BUILT-IN PROTECTION SYSTEMS(Cont.)
THERMAL SHUT-DOWN
LINEAR INTEGRATED CIRCUIT
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 therefore P
D
) and Id are reduced.
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
PURPOSE
VALUE
R1
(Gv-1)*R2
gain setting.
R2
2.2Ω
gain and SVR setting.
R3
Rx
C1
C2
C3
C4
C5
Cx
1Ω
≈20R2
2.2μF
470μF
0.1μF
1000μF
0.1μF
≈1/(2π*B*R1)
LARGE THAN
RECOMMENDED VALUE
SMALLER THAN
RECOMMENDED VALUE
increase of drain current
Decrease of SVR
Danger of oscillation at high
Frequency stability
frequencies with inductive
loads.
Poor high frequencies
Upper frequency cutoff
attenuation
Input DC decoupling
Ripple rejection
Supply voltage bypass
Supply voltage bypass
Frequency stability
Danger of oscillation
Noise at switch-on
switch-off
Decrease of SVR
Danger of oscillation
Higher low frequency
cutoff
Danger of oscillation at
high frequencies with
inductive loads.
Larger bandwidth
Upper frequency cutoff
Lower bandwidth
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R107-002,F
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