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PDF TC643 Data sheet ( Hoja de datos )
| Número de pieza | TC643 | |
| Descripción | INTEGRATED FAN / MOTOR DRIVER | |
| Fabricantes | Microchip | |
| Logotipo |  |
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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
1 page  
INTEGRATED FAN / MOTOR DRIVER
TC643
Figure 1.
µ-CONTROLLER, DIGITAL ASIC, ETC.
TIMER/
COUNTER
I/O
RPM
0.002µF
CEXT
S/W or H/W PWM
PULL-UP
DRV
INTERRUPT LOGIC
ILMT
ONE-
SHOT
dV/dt
DRIVER
I-LIMIT
TC643
VREF
+12V
+5V
VCC
FAN
FAN
GNDFAN
GND
Figure 2. Typical Application Circuit
© 2001 Microchip Technology Inc. DS21445A
5
TC643-1 9/29/97
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TC643.PDF ] | |
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