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EUM6861 Datasheet(PDF) 1 Page - Eutech Microelectronics Inc

Part No. EUM6861
Description  18V PWM Fan Motor Driver
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Maker  EUTECH [Eutech Microelectronics Inc]
Homepage  http://www.eutechmicro.com

EUM6861 Datasheet(HTML) 1 Page - Eutech Microelectronics Inc

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DS6861 Ver1.0 Oct. 2009
18V PWM Fan Motor Driver
EUM6861 is a fan motor driver for the single coil
brushless DC motor. With its high efficient direct
PWM control mode, EUM6861 controls the speed of
brushless DC motor with a built in HALL IC interface.
EUM6861 is suitable to drive variable speed motors
for personal computer’s power supply radiation fans
and CPU coolers.
EUM6861 integrates PWM fan speed control,
minimum speed mode, soft start, fan tachometer, lock
protection, auto restart and Hall Bias functions. PWM
mode controls fan speed in low noise and low vibration
ways by adjusting RCTL voltage. EUM6861 can set
minimum fan speed by presetting RMIN voltage. With
soft start function, EUM6861 can drive motor from
slow speed to fast speed in a settable time by setting
the external capacitor between SS and GND. If a fan
motor is stalled by the external force or obstacles,
overdrive current may incur coil overheat and burning.
To prevent motor from overheating, the lock protection
circuit shuts down the internal power devices for a few
seconds after the motor lock is detected. Then the auto
restart circuit resumes to power up the internal power
devices. If the lock persists, EUM6861 shuts off power
devices for a few seconds. The lock protection delay
time is externally programmable by a capacitor.
EUM6861 has built in motor rotation speed feedback
(FG) output, motor rotation detection (RD) output and
Hall sensor bias output.
Application Circuit
Built in 18V Full-wave Motor Driver for Fan
Built in Input Surge Protection, No Zener Diode
External Programmable Soft Start and Soft
Restart Function
Wide Input Range 3V~18V
PWM Fan Speed Control
Programmable Minimum Fan Speed
Built in Soft Switching Function
Built in Hall Bias
Lock Protection and Auto Restart
Fan Rotation Speed Feedback FG Output
Fan Rotation Detection RD Output
Thermal Shutdown Protection
Available in TSSOP-16 Package
RoHS Compliant and 100% Lead (Pb)-Free
Personal Computer’s Power Supply Radiation
Fans and CPU Coolers
Figure 1. Typical Application Circuit

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