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PDF SDC11557 Data sheet ( Hoja de datos )
| Número de pieza | SDC11557 | |
| Descripción | Single-Phase Full-Wave Motor Driver | |
| Fabricantes | SDC | |
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Single-Phase Full-Wave Motor Driver
Datasheet
SDC11557
General Description
The SDC11557 is a single phase full wave motor driver for
DC fan motors, and can apply to three type speed control
methods. The output signals of this IC are the
amplifications of hall input signals. It is suitable for both
game machine and CPU cooler that need silent fans. The
device is built-in lock protection. When the fan is locked,
the device will enter the lockup protection mode. It is also
with thermal shutdown function. In normal operation, the
supply current is less than 5mA. The SDC11557 is available
in MSOP-8 package.
Features
Silent driver
Built-in lock protection and auto restart function
Low standby current (PWM=0), supply current less
than 200uA
FG output
Built-in thermal protection circuit(RoHS Compliant)
Low duty start up
Applications
Motor drivers for silent fan motors
Pin Configuration
MSOP-8
Pin Number
1
2
3
4
5
6
7
8
OUT2 1
VCC 2
IN+ 3
IN- 4
8 GND
7 OUT1
6 PWM
5 FG
Figure 1. Pin Configuration
Pin Name
OUT2
VCC
IN+
IN-
FG
PWM
OUT1
GND
Function
Motor output terminal 2
Power supply terminal
Hall input terminal+
Hall input terminal-
FG signal output terminal
PWM signal input terminal
Motor output terminal 1
GND terminal
Table 1. Pin Description
January, 2013 Rev. 1.0
©2013 Shaoxing Devechip Microelectronics Co., Ltd.
1/8
www.sdc-semi.com
1 page  
Single-Phase Full-Wave Motor Driver
Typical Application
Coil
Datasheet
SDC11557
1 OUT2
VIN 2 VCC
D1 C1
D2
3 IN+
HALL 4 IN-
GND 8
OUT1 7
PWM 6
FG 5
PWM
Control signal
Pull high
voltage
Figure 4. Typical Application
Function Description
Lockup Protection and Automatic Restart
The SDC11557 provides the lockup protection and
automatic restart functions for preventing the coil
burn-out in the fan is locked. This IC has an internal
counter to determine the shutdown time (tOFF) and
restart time (tON). During shutdown time, the output
IN+
drivers keep turning off for 5 seconds and then enter the
restart time. During the restart time, one output is high
and the other is low, which makes a torque for fan
rotation. The restart time has 0.5 second. If the locked
condition is not removed, the shutdown restart process
will be recurred until the locked condition is released
(see Figure 4. Lockup/Auto Restart Waveform
IN-
OUT1
tOFF
tOFF
tOFF
OUT2
FG
Figure 5. Lockup /Auto Restart Waveform
January, 2013 Rev. 1.0
©2013 Shaoxing Devechip Microelectronics Co., Ltd.
5/8
www.sdc-semi.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SDC11557.PDF ] | |
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