TDA5149G Philips Semiconductors, TDA5149G Datasheet - Page 2

• Manufacturer Part Number: TDA5149G
• Description: 12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
General features
Voice coil motor driver
Spindle motor pre-driver
QUICK REFERENCE DATA
ORDERING INFORMATION
1996 May 06
V
V
V
I
R
oVCM
Single-chip voice coil motor driver and spindle motor
pre-driver
Internal voltage reference generator
Programming of timing parameters via the serial bus
Control of sleep, brake and disable modes for both the
VCM and spindle via the serial bus
Temperature monitor circuit
General purpose uncommitted operational amplifier.
On-board full-bridge power DMOS driver with low R
Class AB linear amplifier with no dead zone
Adjustable gain and bandwidth
Retract circuit operating at power-down.
Designed to drive external N-channel power MOSFETs
for brushless, sensorless DC motors
Internal or external commutation control
Digital commutation timing
Average motor supply current control with Pulse Width
Modulation (PWM)
Soft switching under PWM control
Spindle brake after park at power-down.
DD
DDD
DDA1
12 V Voice Coil Motor (VCM) driver and
spindle motor pre-driver combination chip
DSon
TDA5149G
NUMBER
SYMBOL
TYPE
general supply voltage (pin 54)
digital supply voltage (pin 55)
analog supply voltage (pin 27)
voice coil motor output current
VCM power DMOS total on-resistance
(including leads and bond wires)
LQFP64 plastic low profile quad flat package; 64 leads; body 10
NAME
PARAMETER
DSon
DESCRIPTION
2
T
T
APPLICATIONS
GENERAL DESCRIPTION
The TDA5149G is a combination of a voice coil motor
driver and a spindle motor pre-driver, capable of operating
12 V high-performance hard disk drives.
The device integrates a spindle pre-driver that drives three
external N-channel power MOSFETs in order to drive a
three-phase brushless, sensorless DC motor in full wave
mode. In the normal mode, commutations are generated
from the internal Back EMF (BEMF) sensing circuitry.
Commutations, however, can also be generated from an
external source, thereby providing the possibility of driving
the motor in the stepper-motor mode.
The VCM driver is a linear transconductance amplifier
capable of handling currents up to 1.65 A. It allows
external adjustment of the gain and compensation.
The TDA5149G also contains two drivers for a latch that
secures the heads in the event of power-down.
To control functions such as park, brake, sleep or disable
and to program the different timing parameters, the
TDA5149G is provided with a three-wire serial port. A high
precision voltage monitor is also included, for both
5 and 12 V power supplies. Finally, the IC contains a
temperature monitor circuit and an uncommitted
operational amplifier connected to V
freely within the application. The device is contained in a
LQFP64 package with 4 pins connected to the lead frame
for improved heat dissipation.
j
j
PACKAGE
= 25 C
= 125 C
12 V high-performance hard disk drives.
CONDITIONS
10.8
4.5
4.5
10
MIN.
1.4 mm
12.0
5.0
5.0
TYP.
Product specification
DD
, which can be used
TDA5149G
13.2
5.5
5.5
1.65
0.65
1.1
MAX.
SOT314-2
VERSION
V
V
V
A
UNIT