GENERAL DESCRIPTION
The TDA5147CH is an ASIC combination chip that includes the following functions: spindle motor driver voice coil motor driver retract Power-on.
The circuit is contained in a 64-pin QFP package.

FEATURES
Spindle motor driver
• Internal 2 A peak current power drivers
• Low Rds(on) (1 Ω maximum 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 Pulse Width Modulation (PWM) spindle mode
• Provide spindle active dynamic braking mode.

Voice coil motor driver
• 1.2 A 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 modes of operation:
    – Enable VCM
    – Retract
    – Disable
• Brake after park circuitry.

Power monitor and retract circuit
• +5 V and +12 V power monitor threshold accuracy ±2%
• Hysteresis on both power monitor comparators
• Internal voltage reference: precision 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.

Thermal warning circuit
• Output active 15 °C before general thermal shutdown.

APPLICATIONS
• Hard disk drive for Personal Computer products.