GENERAL DESCRIPTION
The TDA5147K is an ASIC combination chip that includes the following functions; spindle motor drive, voice coil motor drive, retract, and power-on. The circuit is contained in a 52-pin PLCC package.

FEATURES
Spindle motor driver
• Internal 1 A peak current power drivers
• Low Rds(on) 1 Ω max total for high, low and isolation drivers
• Induction sense start-up option
• External current sense resistor
• Soft switching on both upper and lower drivers
• Programmable linear or PWM spindle mode
• Provide spindle active dynamic braking mode.

Voice coil motor driver
• 0.8 Amp VCM power driver
• Maximum of 1 V drop across the power driver at 0.8 A
• External current sense resistor, with sense amplifier
• External current control loop compensation
• 15 kHz (typ.) VCM current control loop bandwidth
• Three mode operation: enable VCM, retract, and disable.

Power monitor and retract circuit
• +5 and +12 V power monitor threshold accuracy ±2%
• Hysteresis on both power monitor comparators
• Precision internal voltage generator ±2%
• Buffered reference voltage output pin
• Retract circuit operates down to 2 V
• Internal thermal sense circuitry with an over temperature shut down option
• Internal boost voltage generator
• Sleep mode.

APPLICATIONS
• Hard disk drive for PC products.