PT2303 데이터 시트보기 (PDF) - Princeton Technology

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PT2303

2W × 2 Class AB Audio Power Amplifier

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

2W × 2 Class AB Audio Power Amplifier

PT2303

If the amplitude of input signal exceed the VDD-GND range, or voltage gain setup too high, the input

stage is very easy overload and distorted. Please make sure the amplitude of audio source (Vin) and

setting the best gain value, in general use the gain setup to +6dB is recommended. Please refer to

following table.

Operating Voltage

VDD=3V

VDD=5V

Gain= 0dB

Vin <5Vpp

Vin <8Vpp

Gain= 6dB

Vin <2.5Vpp

Vin<4Vpp

Gain=12dB

Vin <1.25Vpp

Vin<2Vpp

SE/BTL MODE SWITCHING

PT2303 have two output modes, SE (Single-Ended) or BTL (Bridge-Tied Load). When driving a 4Ω

speaker load suggestion set to the BTL mode for get the more power output. And driving a 32Ω

headphone load, it can be set to SE mode and turn-off the un-work amplifier to decrease stand-by

power consumption. Switching between the SE/BTL modes is controlled by the HP-IN pin, please refer

to following table:

HP-IN

VDD

GND

Output Mode

SE

BTL

OVER TEMPERATURE PROTECTION

The PT2303 has a built-in over temperature protection circuit, it will turn off all output when the chip

temperature over 130℃, the chip will return to normal operation automatically after the temperature

cool down to 100℃.

POP AND CLICK SURPRESS

A power amplifier uses single supply voltage may almost have inrush noise on output in the

power-on/off period. It is because of the output DC potential needs time to stable on 1/2VDD, the

period relative with the capacitance (CB) on the Vref pin. Larger CB value will extend the stable time,

and also can suppress the noise happened in power-on. In supply voltage=5V and CB=2.2µF, stable

time is about 300mS. The value of CB also relative with the value of the DC blocking capacitor

connected in input terminal. In general condition the time constant of DC blocking capacitor should be

less than CB stable time. The recommended value of DC blocking capacitor is 1µF, and the capacitor

of output terminal connected to 32Ω headphone is 220µF. Smaller capacitance can shorten the charge

time to suppress the pop noise, both the input and output capacitance will limited the low frequency

extend range.

PT2303 V1.2

-5-

December, 2007

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