BA6407 [ROHM]
2-phase half-wave motor driver; 两相半波电动机驱动
| 型号： | BA6407 |
| 厂家： | 
ROHM |
| 描述： | 2-phase half-wave motor driver |
| 文件： | 总6页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Motor driver ICs
2-phase half-wave motor driver
BA6407AF
The BA6407AF is a motor driver dedicated to 12V fan motors. Built-in output transistors reduce the number of external
components required. The IC has a lock signal output pin.
FApplications
Fan motors
FFeatures
1) Lock detection and rotational speed sensing mecha-
nisms are built in.
3) Automatic restart when the motor lock is undone.
2) Compact SOP 8-pin package reduces the number of
external components required.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
700
Motor driver ICs
BA6407AF
FBlock diagram
FPin descriptions
701
Motor driver ICs
BA6407AF
FElectrical characteristics (unless otherwise noted, Ta = 25_C and VCC = 12V)
FLock detection
The automatic restart circuit detects a motor lock condi-
tion and automatically turns off the output current. When
the lock condition is cleared, the IC automatically restarts
and allow the motor to run.
Output ON time (TON) and OFF time (TOFF) determined by
the LD capacitor
C S (VLDCL*VLDCP)
TON (Charge time)=
ILDC
In the BA6407AF, automatic restart is performed as fol-
lows.
C S (VLDCL*VLDCP)
TOFF (Discharge time)=
ILDD
A motor lock condition is detected when the Hall signal
stops switching.
(Typical value)
where
C is the capacitance of the LD-pin external capacitor,
VLDCL is the LD-pin clamp voltage (2.48V),
VLDCP is the LD-pin comparator voltage (0.99V),
ILDC is the LD-pin charge current (3.4µA),
The output is ON when the LD pin is being charged, and
OFF when the pin is being discharged.
S The AL pin is ON during normal operation, and OFF
when the motor is locked.
ILDC is the LD-pin discharge current (0.79µA).
S The AL pin is an open collector output.
702
Motor driver ICs
BA6407AF
FApplication example
703
Motor driver ICs
BA6407AF
FOperation notes
VCC
(1) Thermal shutdown circuit
The Hall current is given by:
R1)R2)RH
The IC has a built-in thermal shutdown circuit. There is
a temperature difference of 25_C (typical) between the
temperatures at which the circuit is activated and deacti-
vated.
where RH is the hall device impedance.
Fig.3
(2) Power dissipation
Power consumed in the IC can be calculated from the fol-
lowing equation :
The R1 and R2 resistances must be set so as to maintain
the Hall amplifier input bias voltage within the range of 1V
to (VCC*2V) including the signal amplitude. It is recom-
mended that the same value be used for both resistors
so that the Hall device output signal is centered around
VCC / 2.
PC=PC1)PC2)PC3
PC1 is power consumed by the supply current.
PC1=VCC ICC
PC2 is the output current consumption.
PC2=VOL IO
The Hall device may be affected by power supply noise
due to the PCB conductor pattern. If you have this prob-
lem, insert a capacitor C1 as shown in Fig. 5.
VOL is the LOW level voltage of output pins 1 and 2.
PC3 is power consumed by the AL pin.
PC3=VALL IAL
If the conductor lines from the Hall device output termi-
nalsto the Hall inputs of the IC are particularly long, noise
can be picked up and fed into the inputs. If you have this
problem, insert a capacitor C2 as shown in Fig. 5. Note
that the Hall inputs have no hysteresis in this IC.
where VALL is the AL-pin LOW level voltage and IAL is the
AL-pinsink current. Make sure that your application does
not exceed the allowable power dissipation of the IC.
(3) Hall amplifier input voltage
704
Motor driver ICs
BA6407AF
FElectrical characteristic curves
FExternal dimensions (Units: mm)
705
相关型号：
©2020 ICPDF网 联系我们和版权申明