TDA5145 Datasheet, PDF (2/24 Pages) NXP Semiconductors – Brushless DC motor drive circuit

Philips Semiconductors
Brushless DC motor drive circuit
Product specification
TDA5145
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.)
– built-in current limiter
– soft-switching outputs for low Electromagnetic
Interference (EMI)
• Thermal protection
• Flyback diodes
• Tacho output without extra sensor
• Motor brake facility
• Direction control input
• Reset function
• Transconductance amplifier for an external control
transistor.
APPLICATIONS
• General purpose spindle driver e.g.:
– Hard disk drive
– Tape drive
– Optical disk drive.
GENERAL DESCRIPTION
The TDA5145 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.
It includes bidirectional control, brake function and has a
special circuit built-in to reduce the EMI (soft switching
output stages).
QUICK REFERENCE DATA
Measured over full voltage and temperature range.
SYMBOL
PARAMETER
CONDITIONS
V_P
V_VMOT
V_DO
I_LIM
supply voltage
input voltage to the output driver
stages
drop-out output voltage
current limiting
note 1
note 2
I_O = 100 mA
V_VMOT = 10 V; R_O = 1.2 Ω
Notes
1. An unstabilized supply can be used.
2. V_VMOT = V_P; +AMP IN = −AMP IN = 0 V; all outputs I_O = 0 mA.
MIN.
4
1.7
−
1.8
TYP.
−
−
0.90
2.0
MAX.
18
16
1.05
2.5
UNIT
V
V
V
A
ORDERING INFORMATION
TYPE NUMBER
TDA5145
TDA5145T
PINS
28
28
PACKAGE
PIN POSITION
DIL
SOL
MATERIAL
plastic
plastic
CODE
SOT117-1
SOT136-1
June 1994
2