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BA6295 데이터시트(PDF) 4 Page - Rohm

부품명 BA6295
상세설명  2-channel BTL driver for CD players
Download  5 Pages
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
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BA6295 데이터시트(HTML) 4 Page - Rohm

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Optical disc ICs
BA6295AFP
FCircuit operation
The BA6295AFP comprises a 2-channel driver, internal
bias amplifier, mute pin, and thermal shutdown circuit.
(1)
Driver
The input resistance of the driver is the focus tracking er-
ror signal from the servo preamplifier and the control sig-
nal from the motor. The input signals normally center on
2.5V, and are converted to a VCC / 2-centered signal by
the internal level shift amplifier.
Both positive and negative phases are created during fi-
nal V / I conversion, generating BTL output via the driver
buffer. Because the gain adjustment pins (pins 15, 16, 27
and 28) are external, gain can be adjusted by connecting
a resistor in parallel.
(2)
Internal bias amplifier
This IC’s internal bias is 1 / 2 VCC. Ripple rejection can be
increased and crosstalk reduced by connecting a capaci-
tor to pin 23.
(3)
Mute pins
The output current can be muted by switching one of
these pins to the HIGH level. These pins are also used
for thermal shutdown and should always remain at high
impedance during normal operations. This is because
the thermal shutdown feature is disabled when these
pins are at the LOW level.
FOperation notes
(1)
The BA6295AFP has an internal thermal shutdown
circuit. Output current is muted when the chip tempera-
ture exceeds 190
_C (typically).
(2)
Output current can but muted by raising the voltage
between pins 22 and 8 above 1.5V.
(3)
Shorting pins 22 and 8 disables the thermal shut-
down feature.
(4)
Be sure to connect the IC to a 0.1
µF bypass capaci-
tor to the power supply, at the base of the IC.
(5)
The radiating fin is connected to the package’s in-
ternal GND (pin 8), but both it and pin 8 should also be
connected to an external ground.


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