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PDF PA7493 Data sheet ( Hoja de datos )
| Número de pieza | PA7493 | |
| Descripción | 2W x 2 CLASS AB AUDIO POWER AMPLIFIER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
PA7493
2W X 2 CLASS AB AUDIO
POWER AMPLIFIER (WITH
DC_VOLUME CONTROL)
DESCRIPTION
UTC PA7493 provides precise DC volume control, and a stereo
bridged audio power amplifiers capable of producing 2W into 4Ω as
a monolithic integrated circuit. In stand-by the power consumption
is very low. UTC PA7493 combines a stereo single-end (SE) mode
for headphone drive into a single chip and a stereo bridge-tied
loads (BTL) mode for speaker drive(both modes are easily
switched by the SE/BTL input control signal) to simplify the audio
system design. Package size is not occupies PCB space cause the
built-in over-temperature protection. It is suitable for small or
portable products.
FEATURES
* Stereo switch able bridged/single-ended power amplifiers
* Output power 2W × 2 (VCC=6V, THD=1%, RL=4Ω)
* Low harmonics distortion
* Include 32 steps volume controller by DC voltage with ysteresis
* “Click and pop” suppression circuitry
* Low current consumption in SHUTDOWN Mode(0.7μA)
* Thermal shutdown
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
PA7493L-D16-T
PA7493G-D16-T
- PA7493G-S16-R
Package
DIP-16
SOP-16
CMOS IC
DIP-16
SOP-16
Packing
Tube
Tape Reel
MARKING
DIP-16
SOP-16
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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QW-R502-113.D
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PA7493
CMOS IC
FUNCTION DESCRIPTION
POWER SUPPLY
The UTC PA7493 operating voltage range is from 3V to 6V. In general, the 5V operating voltage is recommended.
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
After powering on the UTC PA7493, connects the SHUTDOWN pin to VCC will force the chip into shutdown mode.
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.
SHUTDOWN PIN
VCC
GND
OUTPUT STATE
SHUTDOWN ON
Normal
INPUT GAIN ADJUST
The output gain of the UTC PA7493 can be adjusted by the external resistor. 0dB gain setting is recommended in
normal operation, please refer the application circuit. If the source output level is not so high (ex :< 2VPP), input gain
can be increased 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 not distorted by overload, please confirm the input signal level. For the gain set
please refer the following table:
Operating Voltage
VCC=3V
VCC=5V
Input Gani=-6db
VIN<5VPP
VIN<8VPP
Input Gain=0db
VIN<2.5VPP
VIN<4VPP
Input Gani=+6db
VIN<1.25VPP
VIN<2VPP
SE/BTL MODE SWITCHING
The UTC PA7493 has two output modes, SE(Single-Ended) or BTL(Bridge-Tied Load). To drive a speaker load,
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:
SE/BTL
VCC
GND
MODE
SE
BTL
CLICK AND POP SURPPRESS
A power amplifier uses single supply voltage may cause noises on the output port during the power-on period. It is
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet PA7493.PDF ] | |
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