VESTEL 17MB45-2, Руководство по обслуживанию

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4 AUDIO AMPLIFIER STAGE WITH PT2333
4.1 General Description of PT2333:
The PT2333 is a Class-D power amplifier designed for audio equipments, maximum
output power can reach up to 2.5W (VDD=5V
, RL=4Ω, THD=10%). The PT2333 composed
of exclusively designed Class-D circuitry (patented) by PTC, along with the most advanced
semi-conductor technology. When compared to the traditional Class-AB amplifiers, the
PT2333’s has a much higher efficiency (>80%), low heat dissipation, and produces superior
audio quality. PT2333’s external circuitry is simple and easily accessible, and consists of
flawless self-protection capabilities. The chip’s packaging is small, thus it occupies an
insignificant amount of space on the circuit board; therefore, making it the predominant
choice when it comes to audio amplifiers.
4.2 Features of PT2333:
• CMOS technology
• Operating voltage range from 2.7V up to 5.5V
• Differential analog input
• Maximum out
put power 2.5W(4Ω) @ THD=10%
• Output low-pass LC filter is not required.
• Voltage gain determinate by the external resister
• Contains shutdown function
• POP noises free in shutdown and power ON/OFF period
• Built-in short circuit protection
• Built-in overheat protection