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BA6295 데이터시트(PDF) 4 Page - Rohm |
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BA6295 데이터시트(HTML) 4 Page - Rohm |
4 / 5 page 200 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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