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參數(shù)資料
| 型號(hào)： | LB8656W |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.6 A, PQFP48 |
| 封裝： | 7 X 7 MM, SQFP-48 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 468K |
| 代理商： | LB8656W |
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LB8656FN, LB8656W
No.7897-14/16
(6) Notes on the constant current rise correction function (ICC pin)
There are cases when the slope of the power supply voltage dependency characteristics of the rise of the output coil
current between OUT5 and OUT6 can be problematic. In such cases, the current rise slope can be set with the time
constant of an external RC circuit by using the ICC pin.
Although the constant current between OUT5 and OUT6 is set with the ICR pin input voltage, a slope can be imposed
on the ICC input voltage with an external RC circuit, and by setting that slope to be larger than the slope of the coil time
constant, correction can be applied to the coil waveform for the rising section of that waveform. This makes it possible
to provide stable shutter operation in the presence of power supply voltage fluctuations.
Note :For this waveform rise correction using the ICC pin, take the voltage in the state where there is no external RC
circuit connected to the ICC pin as the lowest voltage envisioned for VB2, verify the rise waveform of the coil
current at that time, and determine the capacitance so that the time constant is larger than that of this waveform.
However, in cases where this rise correction circuit is not required, for example if the supply voltage is stabilized,
the rise correction external RC circuit is not needed.
(7) Notes on the FC pin phase correction capacitor
The capacitor connected to the FC pin is used for phase correction of the OUT5/OUT6 constant current control circuit.
Consider values in the range 0.0015F to 0.033F for this capacitor and select a capacitor value such that oscillation
does not occur. (If a coil with a particularly large inductance is used, adequate margin must be provided in this
capacitor value.)
Note that since the constant current control block is connected to PGND internally to the IC, the ground side of the FC
pin capacitor must be connected to PGND.
Notes on FC pin capacitor value determination
To determined the value for this capacitor, observe the output voltage waveform and select a value such that the output
does not oscillate. In circuit terms, the FC pin is connected to the constant current control amplifier output block, and
the output transistor is driven by increasing the FC pin potential. That is, since the FC pin's initial state influences the
output drive timing, in this IC the FC pin potential is discharged (by the rapid discharge circuit) internally by the IC to
a fixed level before the shutter is activated so that the FC pin state will always be the same when the shutter is operated.
This stabilizes the I/O delay time.
However, if the capacitor value is too large, the time required for charge and discharge by the previously described
circuit will increase, and the amount of the changes in the I/O delay time due to changes in the capacitor value (both
sample-to-sample variations and changes due to the temperature characteristics) will become larger. Another problem
that can be caused by making this capacitor value larger is that the slope of the rise of the coil current will become more
gradual. Although the slope of the rise of the coil current is in principle determined by the inductance of the coil, if the
capacitor is made larger, the capacitor time constant will become larger and the slope of the coil current rise will
become dependent on the value of this capacitor.
Continued on next page.
ILB01639
Coil current
VB2 high (with no external RC circuit on the ICC pin)
Shutter close operation
Startup correction coil current
ICR pin voltage
ICC pin voltage
ICC pin discharge
VB2 low (with no external RC circuit on the ICC pin)
Startup correction
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