tb2923ahq TOSHIBA Semiconductor CORPORATION, tb2923ahq Datasheet - Page 5

• Manufacturer Part Number: tb2923ahq
• Description: 51 W ? 4-ch Btl Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

V
ref
3. DC Offset Detection
Voltage at (A)
Voltage at (B)
(LPF output)
Elec. vol
Amp output
The purpose of the integrated DC offset detector is to avoid an anomalous DC offset on the outputs,
produced by the input capacitor due to leakage current or short-circuit.
(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
5 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
OUT(-)
S1
S2
OUT(+)
V
TB2923AHQ
CC
)
)
Offset detection
threshold (R
/2
2009-01-29
S2
)