1997 Jul 09
2
Philips Semiconductors
Preliminary specification
12 V Voice Coil Motor (VCM) driver and
spindle motor drive combination chip
TDA5147CH
FEATURES
Spindle motor driver
Internal 2 A peak current power drivers
Low R
ds(on)
(1
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.
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.
The TDA5147CH is controlled by a custom digital ASIC
(see Chapter "Application Information"). The custom ASIC
provides the necessary commutation sequences for the
spindle drivers via the SCNTL1, SCNTL2 and SCNTL3
inputs. Spindle speed is monitored by comparator outputs
SENU, SENV and SENWIS. Motor speed control is
accomplished by a PWM signal (input at pin SIPWM).
Control of the VCM circuits is via the V
IPWMH
and V
IPWML
input signals. These inputs provide control of the voice coil
current.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA5147CH
QFP64
plastic quad flat package; 64 leads (lead length 1.6 mm);
body 14
14
2.7 mm
SOT393-1
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