Friday, March 26, 2010

Rangkaian Amplifier LA4440

This is the circuit of amplifier using IC LA4440. The amplifier circuit uses very less components but a very high quality with respect to its cost and ideal for beginners.

IC LA 4440 is wired as a bridge amplifier to deliver a 19 W Rms on a 4 Ohm speaker atau 6 W rms jika di fungsikan stereo. The IC has built in thermal over voltage and short circuit protection.The IC also incorporates a audio muting function.

Rangkaian 19 Watt Bridge Amplifier  LA4440Rangkaian 19 Watt Bridge Amplifier LA4440
Rangkaian 6 Watt Stereo Amplifier LA4440Rangkaian 6 Watt Stereo Amplifier LA4440

Note:
  • Use a 12 VDC / 3 A power supply, IC LA4440 can with stand up to 18 volts, but I prefer it should not be nothing more than 16V.
  • Do not forget to fit a proper heat sink with IC.
  • Use a 4 Ohm speaker
IC LA4440 Features
  • Built-in 2 channels enabling use in stereo and bridgeamplifier applications. (Stereo 6 Watt Bridge : 19W)
  • Minimun number of external parts required.
  • Small pop noise at the time of power supply ON/OFF and
  • good starting balance.
  • Good ripple rejection : 46dB (typ.)
  • Good channel separation.
  • Small residual noise (Rg=0).
  • Low distortion over a wide range from low frequencies to high frequencies.
  • Easy to design radiator fin.
  • Built-in audio muting function.
  • Built-in protectors.
  • Thermal protector
  • Overvoltage, surge voltage protector
  • cPin-to-pin short protector
Quick Data IC LA4440
  • Maximum supply voltage.............................18 V.
  • Allowable power dissipation Pd max............15 W.
  • Operating temperature Topr........................–20 to +75.
  • Storage temperature Tstg............................–40 to +150.
  • Voltage gain VG..........................................49.5 to 53.5.
  • Output power PO....................................... Stereo 06 W, Bridge 19 W.
  • Input resistance ri ............................. ....... 30kOhm.