tb2921ahq TOSHIBA Semiconductor CORPORATION, tb2921ahq Datasheet - Page 5

• Manufacturer Part Number: tb2921ahq
• Description: 51 W ? 4-ch Btl Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

V
ref
It is possible to use this function by setting the voltage of Pin 22 higher than 8V.
In case of Appearing output offset voltage by Generating a Large Leakage Current on the input Capacitor etc.
4. DC Offset Detection
Voltage at (A)
Voltage at (B)
(LPF output)
Elec. vol
Amp output
(pin 25)
GND
GND
GND
Leakage current
or short-circuit
V
ref/2
R
S1
Figure 5 DC Offset Detection Mechanism
V
bias
+
−
25
5
A
V
LPF
B
Positive DC offset (+)
(caused by R
V
Negative DC offset (−)
(caused by R
The microcontroller shuts down the
system if the output is lower than
the specified voltage.
CC
To a microcontroller
/2 (normal DC voltage)
Time
Time
Time
S1
S2
Out(+)
V
Offset detection
threshold voltage
Out(-)
TB2921AHQ
CC
)
)
/2
2009-02-03