pa7493 ETC-unknow, pa7493 Datasheet - Page 5

• Manufacturer Part Number: pa7493
• Description: 2w X2 Class Ab Audio Power Amplifier With Dc_volume Control
• Manufacturer: ETC-unknow

PA7493
POWER SUPPLY
When the supply voltage less than 3V, the IC can work properly but the distortion will rise. The higher stand-by
current consumption will rise the chip surface temperature after the operating voltage over 6.5V.
SHUTDOWN
At the shutdown mode, the total current consumption is less than 0.7µA, and all of the input/output pins no voltage
output. The chip is back to the normal operation when the SHUTDOWN pin sets to GND.
INPUT GAIN ADJUST
normal operation, please refer the application circuit. If the source output level is not so high (ex :< 2V
can be increased to get the proper volume. The minimum value of the input series resistance is 10KΩ for the modest
input impedance.
please refer the following table:
SE/BTL MODE SWITCHING
set to the BTL mode is recommended for getting the more power output. Driving a headphone load, we suggest
setting to SE mode and turn-off the un-work amplifier to decrease the stand-by power consumption. Switching
between the SE and BTL modes is controlled by the SE/BTL pin, please refer the following table:
CLICK AND POP SURPPRESS
because of the output DC potential level needs time to stable on 1/2Vcc, the period is relative with the capacitor on
the BYPASS pin. The higher capacitor value will extend the stable time and also suppress the noise during the
power-on period. At the supply voltage is 5V and the capacitor is 2.2µF, the stable time is around 300ms. The value
of the BYPASS capacitor also relatives with the DC blocking capacitor connected at the input terminal. In general
condition the time constant of DC blocking capacitor should be less than the CB stable time. Recommend parts
values please refer the application circuit.
The UTC PA7493 operating voltage range is from 3V to 6V. In general, the 5V operating voltage is recommended.
After powering on the UTC PA7493, connects the SHUTDOWN pin to V
The output gain of the UTC PA7493 can be adjusted by the external resistor. 0dB gain setting is recommended in
To make sure the input stage not distorted by overload, please confirm the input signal level. For the gain set
The UTC PA7493 has two output modes, SE(Single-Ended) or BTL(Bridge-Tied Load). To drive a speaker load,
A power amplifier uses single supply voltage may cause noises on the output port during the power-on period. It is
SHUTDOWN PIN
Operating Voltage
FUNCTION DESCRIPTION
SE/BTL
GND
GND
V
V
V
V
CC
CC
CC
CC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
=3V
=5V
SHUTDOWN ON
OUTPUT STATE
Normal
MODE
BTL
Input Gani=-6db
SE
V
V
IN
IN
<5V
<8V
PP
PP
Input Gain=0db
V
V
IN
IN
<2.5V
<4V
CC
PP
PP
will force the chip into shutdown mode.
Input Gani=+6db
V
IN
V
<1.25V
IN
<2V
PP
QW-R502-113.B
CMOS IC
), input gain
PP
PP
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