PT2305 데이터 시트보기 (PDF) - Princeton Technology
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PT2305 Datasheet PDF : 27 Pages
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2.5W × 2 Class AB Audio Power Amplifier
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URL: http://www.princeton.com.tw
PT2305
FUNCTION DESCRIPTION
POWER SUPPLY
The operating voltage of PT2305 is from 2.7V 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
VDD
GND
Output State
Shutdown ON
Normal
MUTE
When the mute pin is connected to the VDD all of outputs signal will be muted immediately, otherwise
connected to the GND the IC is back to the normal operation.
Mute Pin
VDD
GND
Output State
Mute ON
Normal
INPUT GAIN ADJUST
The input gain of the PT2305 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), increase the input gain can get the higher 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
VDD=3V
VDD=5V
Input Gain=-6dB
Vin <5Vpp
Vin <8Vpp
Input Gain=0dB
Vin <2.5Vpp
Vin<4Vpp
Input Gain=+6dB
Vin <1.25Vpp
Vin<2Vpp
OVER TEMPERATURE PROTECTION
The PT2305 has a built-in over temperature protection circuit, it will turn off all power output when the
chip temperature over 150℃, ,the chip will return to normal operation automatically after the
temperature cool down to 105℃.
PT2305 V1.1
-4-
May, 2005
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