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LC4425ALA4485LA4485 LA4425A
5 9 10
11
12
13
1
6 7 8
3
4
2
REF
amplifier
MUTE
MUTE
R
f1
R
f2
R
NF2
R
NF1
BTL IN
BTL OUT
LA4425A
2
1
5
4
+
+
+
V
CC
1000
µ
F
Co 1000
µ
F
Ci 2.2
µ
F
13.2V
3
speaker
4
Ω
59 Car Audio 60 Car Audio
Overview
Functions
Block Diagram
Overview
Functions
Block Diagram
Monolithic Linear IC
Car Radio/Car Stereo 5 W Two-Channel Power Amplifier
that Requires Minimal External Components
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").
■ 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
Large signal
system V
CC
Filter
Filter
Small signal
system V
CC
Channel 1 input
Channel 2 input
Channel 2 output
Channel 1 output
Input
amplifier
(CH1)
Input
amplifier
(CH2)
Pre-driver
amplifier
Pre-driver
amplifier
Short to ground
protection circuit
Short to ground
protection circuit
Standby mode
Standby mode
switch
Thermal protection
circuit
Short to V
CC
protection circuit
Short to V
CC
protection circuit
Output
amplifier
Output
amplifier
Large signal system ground
Small signal system ground
Overvoltage
protection circuit
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.
Monolithic Linear IC
Car Radio/Car Stereo 5 W Power Amplifier that Requires
Minimal External Components
Monolithic Linear IC
Car Radio/Car Stereo 5 W Power Amplifier that Requires
Minimal External Components
■ 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