ON Semiconductor MC642 handbook
Update: 29 September, 2023
The MC642 is a pulse width modulation (PWM) fan speed controller for use with DC motors. It provides temperature proportional speed control. A thermistor connected to the VIN input furnishes the required control voltage of 1.25V to 2.65V for 0% to 100% PWM duty cycle. Minimum fan speed is set by a simple resistor divider on the VMIN input. An integrated Start–Up Timer ensures reliable motor start–up at turn–on, coming out of Shutdown Mode, or following a transient fault. A stalled, open, or unconnected fan causes the MC642 to trigger its start–up timer once. If the fault persists, the FAULT output goes low, and the device is latched in Shutdown Mode. Features include: Shutdown Mode for Power Saving, Supports Low Cost NTC/PTC Thermistors, Temperature Proportional Speed for Acoustic Control / Longer Fan Life, Fan Voltage Independent of MC642 Supply Voltage, Fault Detection Circuits Protect Against Fan Failure and Aid System Testing, Operating Temperature Range: 0°C to +85°C. Typical applications: Power Supplies, Personal Computers, UPS’s, Power Amplifiers, etc.
Brand: ON
File format: PDF
Size: 225 KB
MD5 Checksum: 84FB60FD65941AAE05A1A91510D991A2
Publication date: 11 June, 2012
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PDF Link: ON Semiconductor MC642 handbook PDF