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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC643 Datasheet

INTEGRATED FAN / MOTOR DRIVER

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TC643
INTEGRATED FAN / MOTOR DRIVER
FEATURES
s Integrates Current Limited Power Driver and
Diagnostic/Monitoring Circuits in a Single IC
s Works with Standard DC Brushless Fans/Motors
s Supports Efficient PWM Drive with Logic-Level Input
s Supply Range ........................................ 2.7V to 5.5V
s Motor Voltage Independent of TC643 Supply
Voltage; Supports 3V-15V Fans!
s Logic-Level Output Provides RPM Data
s Optimized For Use as a Microcontroller Peripheral
s Eliminates Discrete Components and Analog
Circuit Design Effort
s Internal Thermal Shutdown For Fail-safe Operation
s Available in 8-Pin PDIP, SOIC, and MSOP
Packaging
APPLICATIONS
s General Purpose Fan or Motor Speed Control
s Power Supplies
s Portable and Desktop Computers
s Telecom Equipment, Servers
s UPS’s, Power Amps, etc.
FUNCTIONAL BLOCK DIAGRAM
RPM
CEXT
0.002µF
DRV
ONE-
SHOT
dV/dt
DRIVER
VFAN
+5V
VCC
FAN
FAN
ILMT
I-LIMIT
TC643
VREF
GNDFAN
GND
GENERAL DESCRIPTION
The TC643 is a switchmode brushless DC fan/motor
speed driver with diagnostic circuits. External components
are kept to a minimum by integrating the power transistor on
chip. Any logic-level signal can be used to drive the on-chip
Power Driver. The output is current limited and a logic-level
indication, ILMT, is provided to indicate an over-current
condition.
The RPM output gives an indication of motor RPM.
Each time the motor current is interrupted by commutation,
a logic pulse occurs on RPM. The fundamental frequency
of the resulting square wave is (4 x rpm). See the Applica-
tions section for more information and system design
guidelines.
The TC643 mates easily with microcontrollers or other
digital logic to form a complete motor or fan control and
monitoring system, featuring: Variable Speed PWM
Drive; RPM Indication; and Motor Open / Motor Shorted
/ Motor Locked Fault Detection.
The TC643 is available in a standard 8-pin plastic DIP,
SOIC, and MSOP package.
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC643VOA
TC643VPA
TC643VUA
8-Pin SOIC
8-Pin Plastic DIP
8-Pin MSOP
0°C to +85°C
0°C to +85°C
0°C to +85°C
PIN CONFIGURATIONS
VCC 1
DRV 2
ILMT 3
RPM 4
PDIP/SOIC
TC643VOA
TC643VPA
8 GNDFAN
7 FAN
6 CEXT
5 GND
MSOP
VCC 1
8 GNDFAN
DRV 2
7 FAN
ILMT 3 TC643VUA 6 CEXT
RPM 4
5 GND
© 2001 Microchip Technology Inc. DS21445A
TC643-1 9/29/97


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC643 Datasheet

INTEGRATED FAN / MOTOR DRIVER

No Preview Available !

INTEGRATED FAN / MOTOR DRIVER
TC643
ABSOLUTE MAXIMUM RATINGS*
Package Power Dissipation (TA 70°C)
Plastic DIP ......................................................730mW
Small Outline (SOIC) ...................................... 470mW
MSOP .............................................................320mW
Derating Factors .................................................. 8mW/°C
Supply Voltage ..............................................................6V
Input Voltage, Any Pin ........ (GDN – 0.3V) to (VCC + 0.3V)
Operating Temperature (Note 3) ........... – 40°C to +125°C
Maximum Chip Temperature (Note 3) ................... +150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Stresses above those listed under "Absolute Maximum Ratings" may
cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions above
those indicated in the operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for extended periods
may affect device reliability.
ELECTRICAL CHARACTERISTICS: Over Operating Temperature Range, VCC = 3.0V to 5.5V ±10%, GND =
GNDFAN = 0V, unless otherwise specified.
Symbol
Parameter
Test Conditions
Min
VCC
ICC
IDD(SHDN)
ILIMIT
CEXT
Power Driver
Supply Voltage
Supply Current, Operating
Supply Current,
Shutdown Mode
Preset Current Limit
Differentiator Capacitor
IL = 300mA
DRV < VIL; ILMT,
RPM Open
Note 1
2.7
VFAN
VCE(SAT)
IFAN
tR
tF
ILEAK
DRV Input
Breakdown Voltage at Fan
Saturation Voltage
(Voltage at FAN)
Average Sink Current
at FAN Output
FAN Rise Time
FAN Fall Time
Leakage Current
DRV VIL
Duty Cycle = 90%; VFAN = 12.0V
IFAN = 300mA DC
IFAN = 200mA DC
IFAN = 100mA DC
DRV > VIH
Note 4
RL = 120to Fan Supply;
CL = 1pF to GND
RL = 120to Fan Supply;
CL = 1pF to GND
RL = 120to Fan Supply;
CL = 1pF to GND
15
600
VIH
VIL
IL
ILMT Output
Input High Voltage
Input Low Voltage
Input Leakage
2.0
VOL
tPROP
Output Low Voltage
IOL = 2.5mA
Time Delay from IFAN > ILIMIT VFAN Connected to +12V
RPM Output
VOH
Output High Voltage
IOH 100µA
VDD – 0.3
VOL
Output Low Voltage
RL = 47kto VDD
tR Rise Time
RPM Output Open Circuited
tF Fall Time
Typ
5
16
.9
500
0.002
1200
800
400
80
80
10
50
50
Max
5.5
24
2
1600
300
1
0.8
5
0.3
0.3
Units
V
mA
mA
mA
µF
V
mV
mA
µsec
µsec
mA
V
V
µA
V
µsec
V
V
nsec
nsec
TC643-1 9/29/97
2 © 2001 Microchip Technology Inc. DS21445A


Part Number TC643
Description INTEGRATED FAN / MOTOR DRIVER
Maker Microchip
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TC643 Datasheet PDF






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