EUM6270
1.2A/18V PWM Fan Motor Driver
DESCRIPTION
EUM6270 is a PWM fan motor driver for single coil
brushless DC motor. With its high efficient direct
PWM control mode, EUM6270 controls the speed of
brushless DC motor. It builds in an interface between a
HALL IC and a single coil motor. EUM6270 is
suitable for variable speed control motor for personal
computer’s power supply radiation fans and CPU
coolers.
The EUM6270 functions include PWM control mode,
minimum speed mode, fan tachometer, soft switching,
lock protection, auto restart, current limit and Hall
Bias.
PWM mode controls internal power devices in low
noise and low vibration fashion. Minimum speed mode
makes the lowest speed of motor settable. If the motor
is stalled by external force or obstacles, overdrive
current may incur coil overheat and burning. To
prevent motor from overheating, the lock protection
circuit will shut down the internal power devices for a
few seconds after motor is locked up. Then auto restart
circuit resumes to power up. The protection and power
up time are settable by external capacitor. When the
voltage drop between VCC and VM is higher than
0.48V (Typ.), the EUM6270 outputs will be turned off
by current limit function. EUM6270 has motor rotation
speed feedback (FG) output and Hall sensor bias
output.
FEATURES
Built in 18V Full-wave Fan Driver
PWM Control Mode
Built in Soft Switching Function
Built in Hall Bias
Settable Minimum Speed Mode
Lock Protection and Auto Restart
FG Output
Current Limit Protection
Thermal Shutdown Protection
Available in TSSOP-20 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
DS6270
Ver1.0
Nov. 2008
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
