TA8275 TOSHIBA [Toshiba Semiconductor], TA8275 Datasheet - Page 3

• Manufacturer Part Number: TA8275
• Description: Max Power 41 W BTL x 4 ch Audio Power IC
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

Caution and Application Method
(Description is made only on the single channel.)
1. Voltage Gain Adjustment
2. Stand-by SW Function
the device a space and total costs saver.
to high and low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3V
about 2 mA (typ.) at the stand-by state.
Control Voltage of pin 4: V
Adjustage of Stand-by SW
(1)
(2)
This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can’t adjusted, but it makes
Therefore, the total voltage gain is decided by expression below.
By means of controlling pin 4 (stand-by terminal)
Stand-by
OFF
ON
Since V
Since the control current is microscopic, the switching relay of small current capacity is satisfactory
The voltage gain of Amp.1:
The voltage gain of Amp.2A, B:
The voltage gain of BLT Connection: G
G
omitted.
for switching
V
= G
BE
V1
(typ.), and the power supply current is
CC
+ G
can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
Power
OFF
ON
V2
+ G
V (BTL)
Input
(pin 4)
V
3~V
0~1.5
SB
Figure 1 Block Diagram
SB
= 0 + 20 + 6 = 26 dB
CC
(V)
Amp. 1
G
G
V1
V2
V (BTL)
= 0 dB
= 20 dB
3
= 6 dB
Amp. 2A
Figure 2 With pin 4 set to High,
Amp. 2B
OFF
ON
Power
4
Power is turned ON
10 kW
V
CC
» 2V
BE
to BIAS
CUTTING CIRCUIT
2002-02-13
TA8275H