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參數(shù)資料
| 型號(hào)： | LB8656W |
| 元件分類： | 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)： | 5/16頁(yè) |
| 文件大?。?/td> | 468K |
| 代理商： | LB8656W |
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LB8656FN, LB8656W
No.7897-13/16
Notes on Application Design
(1) Notes on constant voltage settings for OUT1 to OUT4 and OUT11/OUT12.
The OUT1 and OUT2 high level output voltage can be set with the VC1 pin input voltage.
The equation below gives the output voltage.
(OUT1 and OUT2 output voltage) = (VC1 input voltage) × 5.17
Similarly, OUT3 and OUT4 are set by VC2, and OUT11 and OUT12 are set by VC3.
The equations below gives the output voltages.
(OUT3 and OUT4 output voltage) = (VC2 input voltage) × 5.17
(OUT11 and OUT12 output voltage) = (VC3 input voltage) × 5.17
Also, note that the outputs will saturate if levels that exceed the supply voltage (VB) are set up using the above
equations.
(2) Output pin oscillation stopping capacitors when constant current control is used for OUT1 to OUT4 and
OUT11/OUT12.
It is necessary to connect oscillation prevention capacitors between the outputs when OUT1 to OUT4 and
OUT11/OUT12 are used in constant voltage control mode.
Consider capacitor values in the range 0.01F to 0.1F and select capacitor values such that oscillation does not occur.
Note that these oscillation prevention capacitors are not required if the outputs are driven at saturation.
(3) Notes on constant current settings for OUT5 and OUT6
The constant current setting for OUT5 and OUT6 is determined by the ICR pin input voltage and the value of the
resistor (the current detection resistor) connected to the IMA and IMB pins. Here, the IMA pin is connected to the
H-bridge ground side and the IMB pin is connected to the constant current control amplifier inverting input. The IMA
and IMB pins are used shorted together on the circuit board. (It is ideal to short these pins together close to the current
detection resistor.)
The output current is controlled so that the ICR pin input voltage and the voltage that is generated across the current
detection resistor connected between IMA (IMB) and ground as shown in the block diagram are the same. The
following equation calculates the output current.
(output current) = (ICR input pin voltage) ÷ (current detection resistor value)
Note that since the constant current control block in the IC is connected to PGND, if a voltage is supplied to the ICR pin
with a voltage divider, the ground side of that resistor divider must be connected to PGND.
(4) Notes on the ICH pin
The ICH pin is used to switch the current used for closing and opening the shutter.
The ICH pin goes low only when the shutter circuit is in open mode. (See the truth table.) This makes it possible to set
(switch) the current shutter is open to be lower than the current when the shutter is open.
The ICR pin input voltage is switched by the synthesized resistor value of the resistor connected to the ICH pin and the
resistors (the two resistors between VREF and ground) connected to the ICR pin.
(5) Notes on the FC pin quick charge and quick discharge circuits
To support high-speed shutter control (burst imaging) these IC include built-in quick charge and quick discharge
circuits in the shutter control block (OUT5 and OUT6).
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