Single-Phase Full-Wave Pre Driver
EUM6167
for Fan Motor
DESCRIPTION
EUM6167 is a pre-driver for single coil brushless DC
motor. With an external PWM input signal, EUM6167
can control the speed of DC motor. It is an interface
between a HALL IC and a single coil motor. The
functions built in EUM6167 include PWM control
mode, minimum speed mode, soft-switching time, fan
tachometer, lock protection, auto restart, Hall Bias and
current limiter.
PWM mode controls the external PMOS-NMOS FET
in low noise and low vibration. Minimum speed mode
makes the lowest speed of motor settable.
Soft-switching time can cut the ineffective current
when phase change is not set. If the motor is stalled by
external force or obstacles, overdrive current may incur
coil overheating. To prevent this, the lock protection
circuit shuts down the external power devices for a few
seconds after the motor is locked. Then auto restart
circuit will resume to power up these devices. The
protection and power up time are settable by external
capacitor. EUM6167 has FG output and RD output.
FEATURES
Single-phase Pre Driver
PWM Control Mode
Soft-Switching
Built in Hall Bias
Minimum Speed Settable
Current Limiter
Lock Protection and Auto Restart
FG and RD Output
12V/24V/48V Power Supplies Applicable
Available in TSSOP-20 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
PC/Server FAN Motor
Application Circuit
Figure 1. 12V Application Circuit
DS6167
Ver1.3
Feb. 2009
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
