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PDF RT8749A Data sheet ( Hoja de datos )
| Número de pieza | RT8749A | |
| Descripción | Digital Single-Phase Full Wave BLDC Fan Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8749A
Digital Single-Phase Full Wave BLDC Fan Controller
General Description
The RT8749A is a highly integrated digital controlled pre-
driver 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. 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 the user for different fan models and
applications.
A frequency generator output is included to provide
commutation signals to the host to know the current
rotating speed. The control IC also provides several
protection features, including the peak-current limit, the
thermal shutdown protection, the under-voltage protection
and the motor lock protection. An automatic restart circuit
is designed to rotate the motor after the lock condition is
released.
Applications
Instrumentation Fans
Central Heating Blowers
Automotive Climate Control
Features
Embedded Flash Memory
External PWM Speed Control
Wide Range External PWM Input Frequency
(1kHz 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)
Thin 16-Lead WDFN Package
RoHS Compliant and Halogen Free
Marking Information
1K= : Product Code
1K=YM
DNN
YMDNN : Date Code
Simplified Application Circuit
VM
VIN
V5DDA
RFG
PWM Signal
ROSC
RT8749A
VDD12
VM
UGB1
FG
PWM
LG1
VSS12
ROSC
V5DDD
RNF
ZD1 R1
R2
R5
RFILTER
CFILTER
V5DDA
HN
LG2
HP UGB2
GND
HN Hall V5DDA
HP
RRNF
R3
R4
R6
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8749A-00 May 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8749A
Absolute Maximum Ratings (Note 1)
Supply Voltage, VDD12 --------------------------------------------------------------------------------------------------- −0.3V to 20V
PWM to GND ---------------------------------------------------------------------------------------------------------------- −0.5V to 20V
FG to GND -------------------------------------------------------------------------------------------------------------------- −0.3V to 20V
UGBx to GND --------------------------------------------------------------------------------------------------------------- −0.3V to 20V
UGBx, LGx Current -------------------------------------------------------------------------------------------------------- 100mA
FG Current -------------------------------------------------------------------------------------------------------------------- 15mA
Other Pins -------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, PD @ TA = 25°C
WDFN-16L 4x4 -------------------------------------------------------------------------------------------------------------- 3.38W
Package Thermal Resistance (Note 2)
WDFN-16L 4x4, θJA -------------------------------------------------------------------------------------------------------- 29.5°C/W
WDFN-16L 4x4, θJC -------------------------------------------------------------------------------------------------------- 7.5°C/W
Junction Temperature Range --------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 4kV
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VDD12 -------------------------------------------------------------------------------------------- 5.8V to 15V
Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD12 = 12V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Power Dissipation
Power Supply Current 1
IDD1
PWM pin = VDD12
Power Supply Current 2
IDD2
PWM pin = 0V
Output Driver
High-Side
LGx Output Voltage
Low-Side
UGB Output Low Voltage
VLGH
VLGL
VUGBL
IOH = 10mA
IOL = 10mA
IOL = 50mA
Startup Oscillation Pin
OSC Pin Charge Current
IOSC1
ROSC = 150k
OSC Pin Discharge Current
IOSC2
ROSC = 150k
PWM Input Pin
PWM Input Voltage High-Level VPWMIH
Low-Level VPWMIL
PWM Internal Pull-up Current
PWM Input Frequency
PWM Output Frequency
IPWMIN
FPWMIN
FPWM
PWM pin = 0V
Min Typ Max Unit
-- 4 -- mA
-- -- 300 A
3.6 3.9
--
V
-- 0.5 0.6
-- 0.4 0.6 V
-- 8 -- A
-- 8 -- A
2.2 -- VDD12
V
0 -- 0.7
-- -- 50 A
1 -- 100 kHz
-- 31.25 -- kHz
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8749A-00 May 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT8749A.PDF ] | |
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