BA6295 Rohm, BA6295 Datasheet - Page 4

• Manufacturer Part Number: BA6295
• Description: 2-channel BTL driver for CD players
• Manufacturer: Rohm

FCircuit operation
The BA6295AFP comprises a 2-channel driver, internal
bias amplifier, mute pin, and thermal shutdown circuit.
(1)
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 V
the internal level shift amplifier.
(2)
This IC’s internal bias is 1 / 2 V
increased and crosstalk reduced by connecting a capaci-
tor to pin 23.
FOperation notes
(1)
circuit. Output current is muted when the chip tempera-
ture exceeds 190_C (typically).
(2)
between pins 22 and 8 above 1.5V.
(3)
down feature.
200
Optical disc ICs
Driver
Internal bias amplifier
The BA6295AFP has an internal thermal shutdown
Output current can but muted by raising the voltage
Shorting pins 22 and 8 disables the thermal shut-
CC
. Ripple rejection can be
CC
/ 2-centered signal by
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.
(3)
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.
(4)
tor to the power supply, at the base of the IC.
(5)
ternal GND (pin 8), but both it and pin 8 should also be
connected to an external ground.
Mute pins
Be sure to connect the IC to a 0.1 F bypass capaci-
The radiating fin is connected to the package’s in-
BA6295AFP