Simple audio amplifier circuit - LA4225 pin function

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LA4225 is a 5 watt mono power amplifier from Sanyo

With very few external components, easy assembly and other features

5 watt mono power amplifier (VCC = 18V, RL = 8Ω)

? Complete protection circuit, thermal shutdown protection chip, short-term output DC protection circuit

On-chip noise reduction circuit

LA4225 pin diagram

Pin function:

1, signal input

2, preamplifier grounding

3, signal output

4, the power is positive +

Limit parameters:

Parameter parameter

Symbol symbol

Conditions

Numerical value

Unit unit

Maximum supply voltage Maximum supply voltage VCC max Rg = 0 24 V Maximum output current Maximum output current IO peak 3.3 A Allowable power dissipation Allowable power dissipation Pd max Arbitrarily large heat sink Arbitrarily large heat sink 7.5 W Operating temperature Operating temperature Topr -25 to +75 °C Storage temperature Storage temperature Tstg -40 to +150 °C

parameter:

Parameter parameter Symbol symbol Conditions condition

Numerical value

Unit unit Recommended supply voltage Supply voltage VCC 13.2 V Recommended load resistance Load resistance RL 4 ? Allowable operating voltage range Allowable operating voltage range VCC op Not exceeding the package Pd. 5 to 22 V Recommended load resistance range Load resistance range RL op 4 to 8 ?

Exchange parameters:

Parameter parameter Symbol symbol

Conditions

Numerical value

Unit unit minimum typical maximum Quiescent current quiescent current ICCO

130 mA Voltage gain Voltage gain VG

VO=0dBm

47 dB Output power Output power PO1

VCC = 13.2V, RL = 4Ω, THD = 10%

W PO2 VCC = 18V, RL = 8Ω, THD = 10% 5 W Total harmonic distortion THD PO =1W 0.1 1.0 % Output noise voltage Output noise voltage VNO

Rg = 0, DIN AUDIO

0.15 0.5 mV Ripple rejection Ripple suppression SVRR1

Rg=0, fR=100Hz, Vr=0dBm, DIN AUDIO

30 40 dB SVRR2

Rg=0, fR=1kHz, Vr=0dBm, DIN AUDIO

47 dB Input resistance Input resistance Ri 50 k?

LA4225 power amplifier typical application circuit