AN5278 Panasonic - SSG, AN5278 Datasheet - Page 9

• Manufacturer Part Number: AN5278
• Description: IC AUDIO AMP 4.8W SIL-9 W/FIN
• Manufacturer: Panasonic - SSG
• Type: Class ABr

Specifications of AN5278

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 9W x 1 @ 8 Ohm
• Voltage - Supply: 12 V ~ 26 V
• Features: Mute, Tone and Volume Control
• Mounting Type: Through Hole
• Package / Case: 9-HSIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ICs for Audio Common Use
2.Application Note (continued)
6) Internal DC mute pulse (during power OFF)
7) Shock noise precaution
Technical Information (continued)
During power OFF, the decay response of the RF pin is being made use of internally, to generate an internal DC
mute pulse. The output DC level is made to fall quickly. As the output level falls, any transient noise that happens
prior to the input pin is effectively cut off from the IC. The residual electric charge in the large output capacitor (at
Pin8) is discharged into the IC internal path. By this manner, at the next start-up, the output will start from almost
0 V, and reduce the occurrence of shock noise.
Condition : V
During power ON, to reduce the occurence of “Shock” noise, please be careful when selecting suitable capacitor
values for RF (Pin5) and NF (Pin6).
Recommendation :
1. NF
2. NF
* : Due to small NF capacitor, the low frequency cut-off is about 50 Hz.
* : Due to larger RF capacitor, the start-up time is longer, about 1 second.
10 F
22 F
DC mute
Internal
Output
pulse
Pin8
CC
*
*
18 V, C
RF
RF
RF
100 F to 330 F
220 F to 330 F
100 F, C
NF
10 F, C
VCC
1000 F.
300 ms
AN5278
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