EUM6808 Datasheet, PDF (1/1 Pages) Eutech Microelectronics Inc – PWM Fan Motor Driver with Slope Control

EUM6808
PWM Fan Motor Driver with Slope Control
DESCRIPTION
EUM6808 is a fan motor driver for brushless DC fan
motor. It integrates three types speed control modes
soft switched output, lock protection, Hall bias, FG
output, shutdown mode, quick restart and TSD. With
these modes and functions, EUM6808 can not only be
applied to DC fans which require different speed
curves, but also be applied to NB and other portable
equipments which require silence and low power
dissipation.
The three types speed control modes are PWM control
mode, VCC control mode with slope adjustable,
normal VCC control mode. Soft switched output drives
DC fan in low noise and low vibration. If a DC fan 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. EUM6808 has built in Hall IC bias output,
motor rotation speed feedback (FG). With its shutdown
mode and quick restart, EUM6808 consumes little
power dissipation during shutdown time and can be
started at once regardless of lock detection time.
Application Circuit
FEATURES
Single-Phase Full-Wave Driver System
Three Speed Control Mode
PWM Control Mode
VCC Control Mode with Slope Adjustable
Normal VCC Control Mode
Soft Switched Drive for Silent Application
Lock Detection and Automatic Restart
Shutdown Mode and Quick Restart
Low Standby Current (PWM = L)
FG Output
Hall Bias Output
Thermal Shutdown Protection
Available in UDFN-10 and MSOP-10 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
NB Cooling Fan
Silent Fan Motor
DS6808 Ver0.2 June 2013
Figure 1. PWM Control Mode
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