TA8263BH Datasheet, PDF (6/13 Pages) Toshiba Semiconductor – Max Power 43 W BTL x 4 ch Audio Power IC

TA8263BH
5.3 In Case of Appearing Output Offset Voltage by Generating a Large Leakage Current on
the Input Capacitor etc.
NPN transistor (Q2) is turned on while the inverted output voltage level become less than the
threshold level of output offset voltage detector.
V_ref
Elec. Vol.
Leak or short
V_ref/2 V_bias
V
5V
DC voltage of (+) Amp (at leak)
V_CC/2 (normal DC voltage)
DC voltage of (-) Amp (at leak)
t
Offset voltage (at leak)
25
A
L.P.F.
B
To CPU
*: It is possible to detect the abnormal output offset which is appeared by the large leakage of the input capacitor at
V_ref/2 > V_bias (about 1.4 V)
Figure 9 Application and Detection Mechanism
(-) Amp output
GND
Voltage of point (A)
GND
Voltage of point (B)
GND
Figure 10 Wave Form
V_CC/2
Threshold level
t
t
t
6
2002-02-13