BA6395AFP BA6395AFP 5-channel driver player motors actuators. Thi
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5-channel driver players
BA6395AFP
BA6395AFP 5-channel driver player motors actuators. This internal regulator, suited wide range applications. FApplications players CD-ROM drives FFeatures Internal drivers focus coils, tracking coils, spindle motors, feed motors loading. (The loading spindle motor output pins dual-use output pins switched between drivers using control input.) HSOP 28-pin package allows miniaturization applications.
number external components. Driver gain adjustable with single attached resistor. Internal regulator. (requires attached transistor) Internal thermal shutdown circuit.
FAbsolute maximum ratings 25_C)
FRecommended operating conditions 25_C)
BA6395AFP
FBlock diagram
FPin descriptions
BA6395AFP
FInput output circuits
BA6395AFP
FElectrical characteristics (unless otherwise noted, 25_C, 1kHz,
BA6395AFP
FCircuit operation Driver Inputs focus tracking error signal from servo preamplifier control signal from motor. input signals, which normally center 2.5V, converted preamplifier, generating current corresponding input voltage. This current
BA6395AFP
passed through resistor into internal reference voltage component, preamplifier output being signal centering internal reference voltage. systems (positive phase negative phase) created during conversion, generating output driver buffer.
Regulator This typical series regulator that generates reference voltage internally. saturation transistor must connected.
Operational amplifier standard 4558 type.
BA6395AFP
Channel loading motor driver output mode switching (VCC
Loading motor driver voltage setting Example Forward motor
BA6395AFP
Loading driver output voltage cannot higher than maximum output voltage power supply. example above applies only when setting below maximum output voltage. Maximum output volt-
power supply output opening loading (pin 19).
FApplication example
FOperation notes BA6795AFP internal thermal shutdown circuit. Output current muted when chip temperature exceeds 175_C (typically). mute (pin voltage opened lowered below 0.5V, output current will muted. should pulled above 2.0V during normal use. bias (pin muted when lowered below 1.4V (typically). make sure stays above 1.6V during normal use. driver circuit shuts down when supply voltage drops below 4.3V (typically), starts again when voltage rises above 4.5V (typically). Muting occurs during thermal shutdown, mute-on operations drop bias voltage supply voltage. each case, only drivers muted. During muting, output pins remain internal bias voltage, roughly (VCC-VF) FThermal derating curves
BA6395AFP
internal input resistor positive temperature coefficient roughly 2000ppm degree, when changing gain using attached resistor, gain will also change rate roughly 2000ppm degree. There virtually gain variation temperature when using internal input resistor. sure connect 0.1µF bypass capacitor power supply, base radiating connected package's internal GND, should also connected external ground. capacitor between regulator output (pin also serves prevent oscillation select with good temperature characteristics.
BA6395AFP
FExternal dimensions (Units:
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