TA8270HQ TOSHIBA Semiconductor CORPORATION, TA8270HQ Datasheet - Page 7

• Manufacturer Part Number: TA8270HQ
• Description: Max Power 43 W Btl ? 4 Ch High Efficiency Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

6.
Output Clip Detection Function
Figure 11. In case that the output waveform is clipping, the clip detection circuit is operated and NPN
transistor is turned on.
smoothing circuit as shown in Figure 11.
The output clip detection terminal of pin 25 has the open collector output structure on chip as shown in
It is possible to improve the audio quality with controlling the volume, tone control circuit through L.P.F.
In case of being unused this function, use this IC as open connection on pin 25.
(A) Output (AC wave form)
(B) Clip Detector Circuit
(C) Clip Detector Terminal
(internal)
(pin 25)
Voltage detector
Output offset
Output short
Over voltage
Output clip
protector
protector
detector
GND
5 V
AC
DC
DC
Figure 12 Clip Detection
Pin25: Open collector output (active low)
(C)
(A)
(B)
Q2
(pin 25)
Note: Actualy, the waveform is solid line because the output offset voltage
Q1
Figure 11
25
detection, which is a kind of the self diagnosis, has priority.
Smoothing
7
Circuit
L.P.F
5 V
Output offset voltage detecting term
Clip detecting term
Volume control circuit
Tone control circuit
t
t
t
TA8270HQ
2006-04-28