TA8270HQ TOSHIBA Semiconductor CORPORATION, TA8270HQ Datasheet - Page 6

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

Note 4: It is possible to detect the abnormal output offset which is appeared by the large leakage of the input
V
5.3
(−) Amp
Output
Voltage
of point
(A)
Voltage
of point
(B)
ref
GND
GND
GND
capacitor at V
Elec, vol
In Case of Appearing output Offset Voltage by Generation a Large Leakage Current on
the Input Capacitor etc.
threshold level of output offset voltage detector.
NPN transistor. (Q2) is turned on while the inverted output voltage level become less than the
ref/2
Figure 9 Application and Detection Mechanism
V
Leak or short
ref/2
>V
bias
V
bias
(about 1.4 V)
Figure 10 Wave Form
+
−
25
6
A
V
5 V
L.P.F.
Offset voltage (at leak)
t
B
DC voltagae of (+) Amp
V
DC voltage of (−) Amp
CC/2
To CPU
(Normal DC voltage)
t
t
t
V
Thereshold level
CC/2
TA8270HQ
2006-04-28
(at leak)
(at leak)