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PDF RT8720A Data sheet ( Hoja de datos )
| Número de pieza | RT8720A | |
| Descripción | Single-Phase Full-Wave Fan Motor Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8720A
Single-Phase Full-Wave Fan Motor Driver
General Description
The RT8720A is a single-phase driver IC for fan motors.
Rotation speed is controlled by supply voltage modulation
and PWM input signal. The RT8720A provides several
protection features including lock protection, thermal
shutdown, over-current protection and under-voltage
protection. In thermal shutdown mode, the supply current
is less than 100μA. The rotation frequency is generated
by FG output.
Ordering Information
RT8720A
Package Type
QU : UDFN-8SL 2x2 (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
1U : Product Code
1UW
W : Date Code
Features
Low Supply Current
PWM Supply Voltage Control Fan Speed
Supply Voltage Speed Control
Smart Force Start-up Function
Built-in Lock Protection
Built-in Thermal Shutdown
Built-in Over-Current Protection
Built-in Frequency Generator with FG Output Signal
Include Hall Bias Circuit
RoHS Compliant and Halogen Free
Applications
Single-Phase Fan Motor for Notebook or PC
Pin Configurations
(TOP VIEW)
OUT2
H+
HB
H-
1
2
3
4
8 OUT1
7 VCC
6 PWM
9 5 FG
UDFN-8SL 2x2
Simplified Application Circuit
Supply
Voltage
Optional
D1
D2
RT8720A
VCC
OUT2
C1
Pull-High Voltage
PWM Control Signal
RFG
OUT1
FG H+
HB
PWM
H-
GND
Single-Phase
Brushless M
DC Motor
Hall
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8720A-01 February 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8720A
Parameter
S ymbol
Lock Detection On-Time
Lock Detection Off-Time
Thermal Shutdown Threshold
tON
tOFF
Thermal Shutdown Hysteresis
Standby Detection Time
Quick Start Enable Time
Hall Bias Voltage
Supply Voltage Threshold
tSD
tQS
VHB
VCC_TH
Test Conditions
IHB = 5mA
Min Typ Max Unit
0.35 0.5 0.65 s
3.5 5 6.5 s
-- 160 --
C
-- 30 -- C
0.7 1 1.3 ms
-- 30 -- s
1.26 1.3 1.34 V
3 3.5 4
V
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.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8720A-01 February 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet RT8720A.PDF ] | |
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