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Eutech Microelectronics

EUM6867 Datasheet Preview

EUM6867 Datasheet

PWM Pre Driver

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Preliminary EUM6867
PWM Pre Driver for DC Fan Motor
DESCRIPTION
EUM6867 is a pre driver for single coil brushless DC
motor, specially designed for 12V power supply
application. With an external PWM input signal,
EUM6867 can control the speed of DC motor. It is an
interface between a HALL IC and a single coil motor.
The functions built in EUM6867 include soft start
mode, 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. With soft start function.
EUM6867 can drive motor from slow speed to fast
speed in a settable time by setting the external
capacitor between S-S and 5VREG. 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 overheat/burning. To prevent this, lock protection
circuit can shut down the external power devices for a
few seconds after motor lockup. Then auto restart
circuit will try to power up these devices. The
protection and power up time are settable by an
external capacitor. EUM6867 has FG output.
Application Circuit
FEATURES
z Single-phase full-wave Pre Driver
z PWM Control Mode
z Soft Start Function
z Soft-Switching Time
z Minimum Speed Settable
z Lock Protection and Auto Restart
z FG Output
z Current Limit Protection
z Available in TSSOP-16 Package
z RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
z Personal Computer’s Power Supply Radiation
and CPU Cooler
DS6867 Ver0.1 Nov. 2007
Figure 1.
1




Eutech Microelectronics

EUM6867 Datasheet Preview

EUM6867 Datasheet

PWM Pre Driver

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Tel: 0755-8398 3377 / 135 9011 2223
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Pin Configurations
Package Type
Preliminary
Pin Configurations
EUM6867
TSSOP-16
Pin Description
PIN
OUT2P
OUT2N
VCC
SENSE
RMI
VTH
CPWM
FG
IN-
IN+
CT
S-S
5VREG
SGND
OUT1N
OUT1P
TSSOP-16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DESCRIPTION
Output terminal for external upper side power device
Output terminal for external lower side power device
Power supply terminal
Motor current sense terminal
Motor lowest speed setup terminal
Motor speed control terminal
External capacitor connection terminal for PWM OSC
Rotation speed feedback terminal
Hall input terminal
Hall input terminal
Lock protection time setup terminal
Soft Start setting terminal
5V regulator
GROUND terminal
Output terminal for external lower side power device
Output terminal for external upper side power device
DS6867 Ver0.1 Nov. 2007
2


Part Number EUM6867
Description PWM Pre Driver
Maker Eutech Microelectronics
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EUM6867 Datasheet PDF






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