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PDF AN5272 Data sheet ( Hoja de datos )
| Número de pieza | AN5272 | |
| Descripción | 4.0 W X 2 (18 V/ 8 ohm) Power Amplifier with Variable Audio Output and Volume Control | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for Audio Common Use
AN5272
4.0 W × 2 (18 V, 8 Ω) Power Amplifier with
Variable Audio Output and Volume Control
s Overview
The AN5272 is a monolithic integrated circuit designed
for 4.0 W (18 V, 8 Ω) output audio power amplifier. It is
a dual channel SEPP IC suitable for stereo operation in
TV application.
s Features
• Built-in DC volume control
• Built-in thermal protection circuit
• Built-in over current protection circuit
• 2 Variable Audio Output (VAO)
• VCC operating range : 12.2 V to 27.5 V
s Applications
• TV
7.7±0.3
φ3.6
R1.8
Unit : mm
(12.5)
(1.2)
19.1±0.3
21.9±0.3
HSIP012-P-0000A
s Block Diagram
Volume
Ripple
filter
Over
current
thermal
protection
circuit
1
1 page  
ICs for Audio Common Use
AN5272
s Technical Information (continued)
2.Application Note
1) Voltage gain
The voltage gain of the AN5272 can be varied by changing the resistor R2 as shown below :
GVI
GV input = 4 dB Pin8
which is fixed in 11
internal circuit.
Pin7,12
R1
R1 is always fixed at 20 kΩ.
R2 is variable.
GVO = 20 log (R1/R2)
Typical values are : R1 = 20 kΩ, R2 = 1 kΩ
CNF = 10 µF
R2
GVO = 20 log (20 k/1 k)
= 26 dB
GVTOTAL = GVI + GVO
= 4 dB + 26 dB
= 30 dB
2) DC volume control
The DC volume control range is 0 V to 5 V. This range is used in order to be easily controlled by micro-computer
using PWM output. The recommended circuit and volume attenuation characteristic are shown below :
AN5272
300 Ω 3
Volume
control
R4
18 kΩ
C4
2.2 µF
R5
12 kΩ
Microcomputer IC
PWM
output
Volume
attenuation
Fig. Volume control interface circuit for AN5272
0 0.6 Volume at Pin3 5 (V)
Fig. Volume characteristic of AN5272
3) Oscillation
To prevent oscillation, it is advisable to use RC (Zobel network) at output. C of polyester film capacitor has smaller
characteristic fluctuation with temperature and frequency. The resistor R connected in series with C is effective for
phase correction at high frequency, and as a result, it improves the oscillation allowance.
1000 µF
Pin7
12
C 0.047 µF
R 20 Ω
RL = 8 Ω
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN5272.PDF ] | |
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