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Monolithic Linear IC
Car Radio/Car Stereo 5 W Two-Channel Power Amplifier
that Requires Minimal External Components
LA4485
LA4485
Overview
The LA4485 obviates the need for the BS capacitor, noise filter capacitor, and oscillation prevention RC
components previously required by power amplifier ICs by integrating them on the IC itself. The LA4485 requires
only the barest minimum of external components and both dual and BTL type operation are supported in the
power series ("stylish power").
Functions
Dual: 5 W
2, BTL: 15 W
Extremely few external components required: 4 or 5 in dual mode, 3 or 4 in BTL mode
Built-in Each protection circuits
Overvoltage protection circuit
Thermal protection circuit
Output DC short protection circuit (with respect to both V CC and ground)
Circuit to handle application of +V CC to the outputs
Built-in impulse protection circuit
Standby mode switching function
Audio muting function
Package: SIP13H
Block Diagram
Filter
6
Filter
1
Channel 1 input
Input
amplifier
(CH1)
R f1
R NF1
REF
3
Small signal system ground
amplifier
R NF2
R f2
BTL IN
4
Input
amplifier
2
(CH2)
Channel 2 input
BTL OUT
59 Car Audio
Large signal
Small signal
system V CC
system V CC
7
8
Short to ground
protection circuit
Pre-driver
Output
13
Channel 1 output
amplifier
amplifier
Short to V CC
protection circuit
Thermal protection
circuit
12
Large signal system ground
Overvoltage
protection circuit
Short to V CC
protection circuit
Pre-driver
Output
11
Channel 2 output
amplifier
amplifier
Short to ground
protection circuit
Standby mode
MUTE
switch
5
9
10
Standby mode
MUTE
Monolithic Linear IC
Monolithic Linear IC
Car Radio/Car Stereo 5 W Power Amplifier that Requires
Car Radio/Car Stereo 5 W Power Amplifier that Requires
Minimal External Components
Minimal External Components
LC4425A
LA4425A
Overview
The LA4425A is a 5 W power amplifier IC for car radio and car stereo systems that requires an extremely small
number of external components.
Functions
The industry's first power amplifier that requires so few external components
Provided in the industry's smallest package: SIP-5H (a TP126 type package)
Only required 2 external components: input and output coupling capacitors only
As a power IC, evaluation, adjustment, and investigation are essentially unnecessary
This leads to simplified management
Wide operating supply voltage range: 5 to 16 V
Built-in Each protection circuits
Overvoltage protection circuit
Thermal protection circuit
Output DC short protection circuit
Built-in impulse protection circuit
Package: SIP5H
Block Diagram
5
Ci 2.2 F
+
1
LA4425A
2
3
V CC
13.2V
+
1000 F
Co 1000 F
+
4
speaker
4
60 Car Audio
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