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参数资料
| 型号： | LB8649FN |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.6 A, QCC48 |
| 封装： | 7 X 7 MM, VQFN-48 |
| 文件页数： | 5/9页 |
| 文件大小： | 210K |
| 代理商： | LB8649FN |
LB8649FN
No.7893-5/9
3. VCM constant current control for SH/AE, or stepping motor drive.
Input
Output
IN9
IN10
IN11
IN12
INHD
OUT9
OUT10
OUT11
OUT12
Vref
ISH
Mode
L
-
Stand-by
H
L
*
H
L
H
*
L
H
*
H
L
H
L
*
L
H
L
H
1.0V
SH & AE
H
L
*
H
L
H
*
L
H
*
H
L
H
L
*
L
H
L
H
Setting
voltage
state
Hold
L
H
-
0.67V
Discharge
Stand-by
( - ) is output OFF, and ( * ) is “Don’t care”.
OUT9 and OUT10 are used for the SH.
Quick charge and quick discharge circuitry allows the stabilization of start-up characteristic.
OUT10 and OUT11 are used for the AF.
At the time of stand-by, ISH pin voltage becomes discharge state by the internal transistor and it is set to 0V.
In addition, when IN1 to 8 are input, ISH pin is in discharge state (for start-up correction).
When INHD = “L”, Vref voltage is 1.0V. When INHD = “H”, Vref voltage is 0.67V.
Application Design Notes
1. Constant current setting (ISH, IAE, RFG1, 2, OUT9 to 12)
The constant current setting between pins OUT9 and OUT10 is determined from the ISH input voltage and the
connecting resistor of RFG1. As shown in the block diagram, it is controlled in such a way so that the voltage
generated at the resistor used for current detection connected between RFG1 and GND would be equal to the ISH
input voltage. The formula for calculating the output current is as given below.
(OUT9 to OUT10 Output Current) = (ISH Input Voltage)
÷ (RFG1 Resistor + 0.05Ω)
The 0.05
Ω here is for a common impedance of the output Tr emitter which drives constant current in the RFG pin
and the sensing wiring for the constant current control amplifier.
In the same way, the constant current setting between pins OUT11 and OUT12 is determined from the IAE input
voltage and the connecting resistor of RFG2.
Furthermore, as the constant current control block within the IC is connected to PGND, when supplying voltage to
the ISH pin or IAE pin which has been divided by resistors be sure to connect the ground side of these resistors to
PGND.
2. Quick charge/discharge circuitry (FC1, OUT9, OUT10)
Quick discharge circuitry has been built in to the shutter control block (OUT9 to OUT10) to support high-speed
shutter control, quick recharge, quick discharge and consecutive shots.
Quick recharge and quick discharge circuitry has not been built in to the AE control block (OUT11 to OUT12).
Therefore, make sure to use the block (OUT9 to OUT10) for the shutter drive.
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