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Eutech Microelectronics

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EUM6862 Datasheet

24V PWM Fan Motor Driver

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EUM6862/A/B
24V PWM Fan Motor Driver
DESCRIPTION
EUM6862/A/B is a fan motor driver for the single coil
brushless DC motor. With its high efficient direct
PWM control mode, EUM6862/A/B controls the speed
of brushless DC motor with a built in HALL IC
interface. EUM6862/A/B is suitable to drive variable
speed motors for personal computer’s power supply
radiation fans and CPU coolers.
EUM6862/A/B integrates PWM fan speed control,
minimum speed mode, soft start, 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. EUM6862/A/B can
set minimum fan speed by presetting RMIN voltage.
With soft start function, EUM6862/A/B can drive
motor from slow speed to fast speed in a settable time
by setting the external capacitor between SS and GND.
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,
EUM6862/A/B shuts off power devices for a few
seconds. The lock protection delay time is externally
programmable by a capacitor. EUM6862 has built in
motor rotation speed feedback (FG) output, motor
rotation detection (RD) output and Hall sensor bias
output.
Application Circuit
FEATURES
Built in 24V Full-wave Motor Driver for Fan
Motor
Built in Kickback Voltage Protection, No Zener
Diode Need
External Programmable Soft Start and Soft
Restart Function
Wide Input Range 3V~28V
PWM Fan Speed Control
Programmable Minimum Fan Speed
Built in Soft Switching Function
Built in Hall Bias
Lock Protection and Auto Restart
Fan Rotation Speed Feedback FG Output
(EUM6862/B)
Fan Rotation Detection RD Output
(EUM6862/A)
Thermal Shutdown Protection
Available in TSSOP-16 and TDFN-14 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
PC/Server Fan Motor, CPU Coolers and Printer
Cooling Fan
Figure 1. TSSOP -16 24V and 12V Typical Application Circuit
DS6862/A/B Ver1.5 Jun. 2012
1




Eutech Microelectronics

EUM6862 Datasheet Preview

EUM6862 Datasheet

24V PWM Fan Motor Driver

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Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Application Circuit (continued)
EUM6862/A/B
Figure 2. TDFN-14 24V and 12V Typical Application Circuit
Functional Block Diagram
TSSOP-16 Short together VCC and PVCC, Separate PGND and GND
TDFN-14 Separate VCC and PVCC, Short together PGND and GND
Figure 3. Functional Block Diagram
DS6862/A/B Ver1.5 Jun. 2012
2


Part Number EUM6862
Description 24V PWM Fan Motor Driver
Maker Eutech Microelectronics
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