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參數(shù)資料
| 型號(hào)： | LB8659PL |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.8 A, QCC40 |
| 封裝： | 5 X 5 MM, VQLP-40 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 262K |
| 代理商： | LB8659PL |
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LB8659FN, LB8659PL
No.7899-13/16
Application Design Notes
(1) Constant-voltage setting for OUT1 to OUT8
“H” output voltage for OUT1 and OUT2 can be set by the VC1 pin input voltage.
The setting formula is as follows:
(OUT1/OUT2 output voltage) = (VC1 input voltage)
×5.23
Correspondingly, OUT3 and OUT4 can be set by VC2, OUT5 and OUT6 can be set by VC3, and OUT7
and OUT8 can be set by VC4. The setting formula is as follows:
(OUT3/OUT4 output voltage) = (VC2 input voltage)
×5.23
(OUT5/OUT6 output voltage) = (VC3 input voltage)
×5.23
(OUT7/OUT8 output voltage) = (VC4 input voltage)
×5.23
In addition, if the right side setting of the above formula exceeds the supply voltage (VB), the output
voltage is saturated.
(2) Output pin oscillation prevention capacitor for OUT1 to OUT8 constant-voltage control
For constant-voltage control of OUT1 to OUT8, a capacitor must be placed between OUT pins in order to
prevent oscillation.
Test capacitor values between 0.01
F to 0.1F and choose a value that does not cause output oscillation problems.
However, for the saturated drive, no oscillation prevention capacitor is necessary.
(3) Constant-current setting of OUT9 and OUT10
Constant-current setting between OUT9 and OUT10 depends on the IC pin input voltage and IMA/IMB pin
connection resistance (current detection resistor). The IMA pin is connected to the GND side of H-bridge and the
IMB pin is connected to the negative input of constant-current control amplifier. The IMA pin and the IMB pin are
short circuited on the PWB to be used. (Short circuit near the current detection resistor is recommended.)
As shown in the block diagram, the output current is controlled so that the IC pin input voltage can be equal to the
voltage generated on the current detection resistor, which is connected between IMA (IMB) and GND.
The formula for output current is as follows:
(Output current) = (IC input pin voltage)
÷ (current detection resistance)
In addition, since the constant-current control block is connected to PGND inside the IC, when the voltage is
supplied to the IC pin with partial resistance, GND side of the resistor must be connected to PGND.
(4) ICH pin [Applied to LB8659FN only]
For the application when current is switched between shutter “Close” and “Open”, the ICH pin is used.
The ICH pin is changed to “L” only in “Open” mode (refer to the Truth table). This allows the current for shutter
“Open” to be set (switched) lower than the current for shutter “Close”.
The IC pin input voltage is switched by the combined resistance value which is obtained from resistance connected
to the IC pin (2 resistors between VREF and GND) and a resistor connected to the ICH pin.
(5) Fast charge/discharge circuit for the FC pin
In order to support high speed shutter control (sequential shutter), a built-in fast charge/fast discharge circuit is
implemented in the shutter control block (OUT9 and OUT10).
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