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BA6438 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BA6438은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 BA6438 자료 제공

부품번호 BA6438 기능
기능 3-phase motor driver
제조업체 ROHM Semiconductor
로고 ROHM Semiconductor 로고


BA6438 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.



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BA6438 데이터시트, 핀배열, 회로
Motor driver ICs
3-phase motor driver
BA6438S
BA6438S
The BA6438S is a 3-phase, full-wave, pseudo-linear motor driver suited for VCR capstan motors. The IC has a torque
ripple cancellation circuit to reduce wow and flutter, and an output transistor saturation prevention circuit that provides
superb motor control over a wide range of current. The built-in motor power switching regulator allows applications with
low power consumption
!Applications
3-phase VCR capstan motors
!Features
1) 3-phase, full-wave, pseudo-linear drive system.
2) Torque ripple cancellation circuit.
3) Reversal brake based on the detection of motor
direction.
4) Output transistor (high-and low-sides) saturation
prevention circuit
5) Motor power switching regulator with oscillation circuit.
6) Output-to-GND short-circuit detection.
7) Available in SDIP 24-pin power package (with radiation
fins).
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Applied voltage
VCC
7
Applied voltage
Power dissipation
VM
Pd
24
20001
Operating temperature
Topr
10 ∼ +75
Storage temperature
Tstg
40 ∼ +150
Allowable output current
IOpeak
1.72
1 Reduced by 16mW for each increase in Ta of 1°C over 25°C.
2 Should not exceed the ASO value.
Unit
V
V
mW
°C
°C
A
!Recommended operating conditions (Ta = 25°C)
Parameter
Operating power supply voltage
Operating power supply voltage
Symbol
VCC
VM
Min.
4
3
Typ.
5
12
Max.
6
23
Unit
V
V




BA6438 pdf, 반도체, 판매, 대치품
Motor driver ICs
!Circuit operation
(1) Pseudo-linear output and torque ripple cancellation
The IC generates a trapezoidal (pseudo-linear) output
current, whose waveform phase is 30 degrees ahead of
that of the Hall input voltage (Fig. 1).
.
Hall input
30°
Output current
Fig. 1
The trapezoidal waveform of output current would create
intermittence in the magnetic field generated by the 3-
phase motor, and would result in an irregular rotation of
the motor. To prevent this, the output waveform is ob-
tained by superimposing a triangular wave on the trape-
zoidal wave (Fig. 2). This process is called torque ripple
cancellation.
BA6438S
A brake is applied to the motor as described in the
following.When the motor is running, pin 17 is given a
negative potential with respect to the reference potential. If
the pin 17 potential becomes positive, the IC detects the
rise of pin 17 potential above the reference potential and
activates the motor direction detecting circuit.
The motor direction detecting circuit sends a signal to the
motor direction setting circuit to reverse the motor direc-
tion. This causes a braking torque that depends on the
pin 17 potential, so that the motor quickly reduces its
speed. At the same time, the positive pin 17 potential is
shifted to the reference potential, so that the motor stops
smoothly.
(3) Output current sensing and torque limitation
Pin 2 is the ground pin for the output stage. To sense the
output current, a resistor (0.5recommended) is con-
nected between pin 2 and the ground. The output current
is sensed by applying the voltage developed across this
resistor to pin 22 as a feedback.
The output current can be limited by adjusting the voltage
applied to pin 20. The current is limited when pin 20
reaches the same potential as pin 22. The output current
(IMAX. ) under this condition is given by:
Fig. 2
(2) Torque control and reversal brake
The output current can be controlled by adjusting the
voltage applied to the torque control pins (pins 16 and 17).
These pins are the inputs to a differential amplifier. A ref-
erence voltage between 2.3 ~ 3.0V (2.5V recommended)
is applied to pin 16.
IMAX.=
V20P(TLCSofs)
R2P
where R2P is the value of the resistor connected between
pin 2 and the ground, V20P is the voltage applied to pin 20,
and (TL–CSofs ) is the offset between the TL and CS pins.
VM
24pin
Output current
Pin 16
reference voltage (2.5 V)
1pin 3pin 23pin
ATC
2pin
Offset
0 Pin 17 voltage
Dead zone (100 mV typically)
Fig. 3
Fig.4 Output circuit

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BA6438 전자부품, 판매, 대치품
Motor driver ICs
!Electrical characteristic curves
0.7
VCC=5V, VM=12V, RATC=0.5
0.6 (H1+ , H2+ , H3+ ) = (LMH)
0.5
0.4
0.3
0.2
0.1
0
0 1.0 2.0 3.0 4.0 5.0
TORQUE CONTROL : EC (V)
Fig.9 Output current vs. torque
control voltage (Ι)
160
VCC=5V
140 VM=12V
RATC=0.5
120
(H1+ , H2+, H3+)
100 = (LMH)
80 (H1+ , H2+, H3+)
= (LLH)
60
40
20
0
800 600 400 200 0
200
TORQUE CONTROL : EC (mV)
400
Fig.10 Output current vs. torque
control voltage (ΙΙ)
BA6438S
30
VCC=5V,VM=12V,RATC=0.5
(H1+ , H2+ , H3+) = (LMH)
25
20
15
10
5
0
120 80 40 ECR +40 +80
(2.5V)
TORQUE CONTROL : EC (mV)
Fig.11 Output current vs. torque
control voltage (ΙΙΙ)
1.8
1.6
1.4
1.2
1.0 HIGH level output voltage
(1, 3, 23pin)
0.8
0.6
0.4
0.2
0
0 200 400 600 800 1000
OUTPUT CURRENT : IOH (mA)
Fig.12 Output high level voltage
vs. output current
1.8
1.6
LOW level output voltage
1.4 (1, 3, 23pin)
1.2
1.0
0.8
0.6
0.4 ATC(2pin)
Pin voltage
0.2 (RATC = 0.5Ω)
0
0 400 800 1200
OUTPUT CURRENT : IOL (mA)
Fig.13 Output low level voltage
vs. output current
70
VCC=5V, VM=12V, RATC=0.5
EC=OV, ECR=2.5V
60
50
40
30
20
10
0
0 0.2 0.4 0.6
TORQUE LIMIT VOLTAGE : TL(V)
Fig.14 TL-CS offset vs. torque
limit voltage
VCC=5V
1M
500k
300k
200k
100k
50k
50 100 200 300 500 1000
OSC PIN CAPACITANCE(PF)
Fig.15 Capacitance of the capacitor
connected to the OSC pin vs.
oscillation frequency
5
4
Ec=2.3V 2V 1.0V 0.5V
3
1.5V
2
1
0
0 0.5 1.0 1.5 2.0 2.5 3.0
VM -VOH (V)
Fig.16 High-side saturation detection
output voltage (pin 14) vs.
output voltage
6
VCC=5V
5
4
3
2
1
0 10 20 30 40 50 60
SINK CURRENT(13pin) (mA)
Fig.17 Switching regulator sink
current vs. output voltage

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