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PDF RT8720B Data sheet ( Hoja de datos )
| Número de pieza | RT8720B | |
| Descripción | Single-Phase Full-Wave Fan Motor Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8720B
Single-Phase Full-Wave Fan Motor Driver
General Description
The RT8720B is a single-phase driver IC for fan motors.
Rotation speed is controlled by supply voltage modulation.
In the supply voltage control application, the fan speed
slope is adjustable by the external voltage input. The
RT8720B 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
RT8720B
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
1V : Product Code
1VW
W : Date Code
Features
Low Supply Current
Adjustable 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 SET
9 5 FG
UDFN-8SL 2x2
Simplified Application Circuit
Supply
Voltage
Optional
D1
D2
RT8720B
VCC
OUT2
C1
Pull-High Voltage
Floating
RFG
OUT1
FG H+
HB
SET
H-
GND
Single-Phase
Brushless M
DC Motor
Hall
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8720B-01 March 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Typical Application Circuit
Supply
Voltage
Optional
D1
D2
RT8720B
7 VCC
OUT2 1
C1
Pull-High Voltage
RFG 5 FG
Floating
6 SET
9 (Exposed Pad)
GND
OUT1 8
HB 3
H+ 2
H- 4
Single-Phase
Brushless
DC Motor
Hall
M
RT8720B
Figure 1. Fan Speed Controlled by Supply Voltage, it's known as “VCC Mode”.
Supply
Voltage
Optional
D1
D2
RT8720B
7 VCC
OUT2 1
C1
Pull-High Voltage
RFG 5 FG
OUT1 8
Single-Phase
Brushless
DC Motor
HB
R1
R1 + R2 = 100k R2
6 SET
HB 3
H+ 2
H- 4
GND
9 (Exposed Pad)
Hall
M
Figure 2. Fan Speed Controlled by Supply Voltage with Slop Setting, it's known as “ADJ Mode”.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8720B-01 March 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet RT8720B.PDF ] | |
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