TC643
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 ponents 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 puters s Tele Equipment, Servers s UPS’s, Power Amps, etc.
FUNCTIONAL BLOCK DIAGRAM
CEXT 0.002µF
ONESHOT d V/dt
DRIVER
VFAN +5V
VCC FAN
- +
ILMT
I-LIMIT
VREF
GNDFAN GND
GENERAL DESCRIPTION
The TC643 is a switchmode brushless DC fan/motor speed driver with diagnostic...
