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參數(shù)資料
| 型號(hào)： | LV8130V |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.05 A, PDSO30 |
| 封裝： | SSOP-30 |
| 文件頁(yè)數(shù)： | 8/19頁(yè) |
| 文件大?。?/td> | 520K |
| 代理商： | LV8130V |
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LV8130V
No.A1708-16/19
9. Constraint Protection Circuit
When the motor is physically constrained (held stopped), the CSD pin external capacitor is charged (to approx. 3.0V)
by a constant current of approx. 2.25
μA and is then discharged (to approx. 1.0V) by a constant current of approx.
0.15
μA. This process is repeated, generating a sawtooth wave. The constraint protection circuit turns motor drive on
and off repeatedly based on this sawtooth waveform. (The UH, VH and WH side outputs are turned on and off.) Motor
drive is on during the period the CSD pin external capacitor is being charged from approx. 1.0V to approx. 3.0V, and
motor drive is off during the period the CSD pin external capacitor is being discharged from approx. 3.0V to approx.
1.0V. The IC and the motor are protected by this repeated drive on/off operation when the motor is physically
constrained.
The motor drive on and off times are determined by the value of the connected capacitor C (
μF).
TCSD1 (drive on period)
≈ 0.9 × C (seconds)
TCSD2 (drive off period)
≈ 13.7 × C (seconds)
When a 0.47
μF capacitor is connected externally to the CSD pin, this iterated operation will have a drive on period of
approx. 0.4 seconds and drive off period of approx. 6.4 seconds.
While the motor is turning, the discharge pulse signal (generated once for each Hall input period) that is created by
combining the Hall inputs internally in the IC discharges the CSD pin external capacitor. Since the CSD pin voltage
does not rise, the constraint protection circuit does not operate.
When the motor is physically constrained, the Hall inputs do not change and the discharge pulses are not generated. As
a result, the CSD pin external capacitor is charged by a constraint current of approx. 2.25
μA to approx. 3.0V, at which
point the constraint protection circuit operates. When the constraint on motor is released, the constraint protection is
released.
Connect the CSD pin to ground if the constraint protection function is not used.
10. Forward/Reverse Direction Operation
This IC is designed so that through currents (due to the output transistor off delay time when switching) do not flow in
the output when switching directions when the motor is running. However, if the direction is switched when the motor
is running, current levels in excess of the current limiter value may flow in the output transistors due to the motor coil
resistance and the motor back EMF state when switching. Therefore, designers must consider selecting external
transistors that are not destroyed by those current levels or switching directions only after the speed has fallen below a
certain speed.
11. Handling Different Power Supply Types
When this IC is operated from an externally supplied 5V power supply (4.5V to 5.5V), short the VCC pin to the VREG
pin and connect them to the external power supply.
When this IC is operated from an externally supplied 12V power supply (8V to 17V), connect the VCC pin to the power
supply. (The VREG pin will generate a 5V level to function as the control circuit power supply.)
12. Power Supply Stabilization
Since this IC uses a switching drive technique, the power supply line level can be disturbed easily. Therefore,
capacitors with adequate capacitance to stabilize the power supply line must be inserted between VCC pin and ground.
If diodes are inserted in the power supply line to prevent IC destruction if the power supply is connected with reverse
polarity, the power supply lines are even more easily disrupted. And even larger capacitor are required.
If the power supply is turned on and off by a switch, and if there is a significant distance between the switch and the
stabilization capacitor, the supply voltage can be disrupted significantly by the line inductance and surge current into
the capacitor. As a result, the withstand voltage of the device may be exceeded. In application such as this, the surge
current must be suppressed and the voltage rise prevented by not using ceramic capacitors with a low series impedance,
and by using electrolytic capacitors instead.
13. VREG Stabilization
To stabilize the VREG voltage, which is the control circuit power supply, a 0.1
μF or larger capacitor must be inserted
between the VREG pin and ground. The ground side of this capacitor must be connected to the IC ground pin with a
line that is as short as possible.
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