TA8276HQ Просмотр технического описания (PDF) - Toshiba
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TA8276HQ Datasheet PDF : 14 Pages
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Caution and Application Method
(Description is made only on the single channel.)
TA8276HQ
1. Voltage Gain Adjustment
This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can’t adjusted, but it makes
the device a space and total costs saver.
Input
Amp. 1
Amp. 2A
Amp. 2B
Figure 1 Block Diagram
The voltage gain of Amp.1:
GV1 = 0 dB
The voltage gain of Amp.2A, B:
GV2 = 20 dB
The voltage gain of BLT Connection: GV (BTL) = 6 dB
Therefore, the total voltage gain is decided by expression below.
GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26 dB
2. Stand-by SW Function (pin 4)
By means of controlling pin 4 (stand-by terminal)
to high and low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3VBE (typ.), and the power supply current is
about 2 µA (typ.) at the stand-by state.
ON Power 10 kΩ
4
OFF
Control Voltage of pin 4: VSB
VCC
≈ 2VBE
to BIAS
CUTTING CIRCUIT
Stand-by
ON
OFF
Power
OFF
ON
VSB (V)
0~1.5
3~VCC
Adjustage of Stand-by SW
Figure 2 With pin 4 set to High,
Power is turned ON
(1) Since VCC can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
omitted.
(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory
for switching
3
2004-05-10
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