EUM6261/6261A
1A /18V PWM Fan Motor Driver
DESCRIPTION
EUM6261/6261A is a fan motor driver for the single
coil brushless DC motor. With its high efficient direct
PWM control mode, EUM6261/6261A controls the
speed of brushless DC motor with a built in HALL IC
interface. EUM6261/6261A is suitable to drive
variable speed motors for personal computer’s power
supply radiation fans and CPU coolers.
EUM6261/6261A integrates PWM fan speed control,
minimum speed mode, 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. EUM6261/6261A can set
minimum fan speed by presetting RMIN voltage.
EUM6261/6261A internally limits to the 10% lowest
fan speed. 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,
EUM6261/6261A shuts off power devices for a few
seconds. The lock protection delay time is externally
programmable by a capacitor. EUM6261/6261A has
built in motor rotation speed feedback (FG) output,
motor rotation detection (RD) output and Hall sensor
bias output.
FEATURES
Built in 18V Full-wave Fan Driver
PWM Fan Speed Control
Programmable Minimum Fan Speed
Internal 10% Minimum Fan Speed Clamp
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
APPLICATIONS
Personal Computer’s Power Supply Radiation
Fans and CPU Coolers
Application Circuit
Figure 1. Typical Application Circuit
DS6261/6261A Ver1.1
Oct. 2008
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
