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PDF RT8749 Data sheet ( Hoja de datos )
| Número de pieza | RT8749 | |
| Descripción | Digital Single-Phase Full Wave BLDC Fan Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8749
Digital Single-Phase Full Wave BLDC Fan Controller
General Description
The RT8749 is a highly integrated digital control IC for
regulating single-phase full wave brushless DC (BLDC)
fans at a programmed speed. The controller IC accepts a
Pulse-Width Modulated (PWM) signal provided by the
host, and decodes the duty-ratio of this PWM signal to
256 counts. The decoded duty-ratio will then be used for
mapping to the programmed speed which is stored at the
embedded flash memory. This speed profile can be
programmed by users for different fan models and
applications. By integrating a low RDS(ON) power MOSFET,
the RT8749 minimizes component count on the PCB, thus
reducing board size and cost of the motor/fan module.
A frequency generator output is included to provide
commutation signals to the host for the current rotating
speed. The control IC also provides several protection
features, including the peak-current limit, thermal shutdown
protection, under-voltage protection and motor lock
protection. An automatic restart circuit is designed to
rotate the motor after the lock condition is released.
Features
Embedded 256 x 16 Bits Flash Memory
Built-in Low RDS(ON) Power MOSFET
External PWM Speed Control
Wide Range External PWM Input Frequency
(100Hz to 100kHz)
Built-in Frequency Generator with Selectable FG
or FG/2 Output Signal
Built-in Peak Current Limit
Built-in Motor Lock Protection and Automatic
Restart Circuit
Built-in Thermal Shutdown Protection
Low Power Standby Mode (when PWM Input is
Low)
RoHS Compliant and Halogen Free
Applications
PC Fan
Cooling Fan
Single-Phase BLDC Motor
Simplified Application Circuit
VDD
External Voltage Source (up
to 12V) or V5DDA (V5DDA
will disable at Standby Mode)
RFG
ROSC
PWM Signal
RT8749
OUT1
RNF
OUT2
BOOT1
VDD12 BOOT2
V5DDD
VDD12M
V5DDA
ROSC
FG
PWM
HN
HP
GND
VSS12
RRNF
V5DDA
H
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8749-00 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8749
Parameter
PWM Input
PWM Input
Voltage
Level-High
Level-Low
PWM Internal Pull-up Current
PWM Input Frequency
ROSC Frequency
Current Limitation
Current Limit
Threshold Voltage
Thermal Protection
Thermal Shutdown Temperature
Symbol
VPWMH
VPWML
IPWMIN
fPWMIN
fROSC
ILIM
VRN F
TSD
Test Conditions
VPW M = 0V
ROSC = 150k
RRNF = 0.25
Min Typ Max Unit
2.2 -- VDD12
V
0 -- 0.7
-- -- 50 A
0.1 -- 100 kHz
-- 1 -- MHz
-- 1 --
0.2 0.25 0.3
A
V
-- 150 -- °C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8749-00 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT8749.PDF ] | |
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