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PT2300 V1.0

- 4 -

December, 2005

2W x 2 Class AB Audio Power Amplifier

PT2300

FUNCTION DESCRIPTION

POWER SUPPLY

The operating voltage of PT2300 is from 3V to 6V, In general operation 5V is recommended. When the

supply voltage less then 3V the IC can work properly, but the distortion reading will rise. After the

supply voltage over 6.5V, the higher stand-by current consumption will rising the temperature on chip

surface。

SHUTDOWN

When the DC supply still powered the chip Vcc, pull-up the shutdown pin to the Vcc level will take the

chip into the shutdown mode. After the shutdown mode is active the total current consumption is less

than 0.7µA, and the all of input or output pins no voltage output. When shutdown pin set to GND, the IC

is back to the normal operation.

Shutdown pin

Output state

Vcc

Shutdown ON

GND

Normal

INPUT GAIN ADJUST

The output gain of the PT2300 can be adjust by the external resistor, in normal operation 0dB gain

setting is recommended, please refer to the application circuit. If the source output level is not so high

(ex :< 2Vpp), input gain can be increase to get the proper volume. The minimum value of the input

series resistance is 10KΩ for the modest input impedance.

To make sure the input stage will not be distortion by overload, please confirm the input signal level, for

the gain set please refer to the following table:

Operating voltage

Input gain = –6dB

Input gain = 0dB

Input gain = +6dB

VDD=3V

Vin <5Vpp

Vin <2.5Vpp

Vin <1.25Vpp

VDD=5V

Vin <8Vpp

Vin<4Vpp

Vin<2Vpp

SE/BTL MODE SWITCHING

PT2300 have two output mode, SE (Single-Ended) or BTL (Bridge-Tied Load). When driving a speaker

load suggestion set to the BTL mode for get the more power output. And driving a 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 SE/BTL pin, please refer to following table:

SE/BTL

Mode

Vcc

SE

GND

BTL