Philips Semiconductors
Brushless DC motor drive circuit
Product specification
TDA5144
FEATURES
• Full-wave commutation (using push/pull drivers at the
output stages) without position sensors
• Built-in start-up circuitry
• Three push-pull outputs:
– output current 2.0 A (typ.)
– low saturation voltage
– built-in current limiter
– soft-switching outputs for low Electromagnetic
Interference (EMI)
• Thermal protection
• Flyback diodes
• Tacho output without extra sensor
• Transconductance amplifier for an external control
transistor.
APPLICATIONS
• General purpose spindle driver (e.g. for hard disk)
• Laser beam printer.
GENERAL DESCRIPTION
The TDA5144 is a bipolar integrated circuit used to drive
3-phase brushless DC motors in full-wave mode. The
device is sensorless (saving of 3 hall-sensors) using the
back-EMF sensing technique to sense the rotor position.
A special circuit is built-in to reduce the EMI (soft switching
output stages). It is ideally suited as a drive circuit for hard
disk drive spindle motor requiring powerful output stages
(current limit of 2.0 A). It can also be used in e.g. laser
beam printer and other applications.
QUICK REFERENCE DATA
Measured over full voltage and temperature range.
SYMBOL
VP
VVMOT
VDO
ILIM
PARAMETER
supply voltage
input voltage to the output
driver stages
drop-out output voltage
current limiting
CONDITIONS
note 1
note 2
IO = 100 mA
VVMOT = 10 V; RO = 1.2 Ω
Notes
1. An unstabilized supply can be used.
2. VVMOT = VP; +AMP IN = −AMP IN = 0 V; all outputs IO = 0 mA.
MIN.
4
1.7
TYP.
−
−
MAX.
18
16
UNIT
V
V
−
0.90 1.05 V
1.8
2.0
2.4
A
ORDERING INFORMATION
TYPE NUMBER
TDA5144AT
TDA5144T
PINS
20
28
PACKAGE
PIN POSITION
SOL
SOL
MATERIAL
plastic
plastic
CODE
SOT163-1
SOT136-1
June 1994
2