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参数资料
| 型号： | LB8649W |
| 元件分类： | 运动控制电子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 0.6 A, PQFP48 |
| 封装： | 7 X 7 MM, QFP-48 |
| 文件页数： | 5/9页 |
| 文件大小： | 128K |
| 代理商： | LB8649W |
LB8649W
No.7894-5/9
(3) SH/AE system VCM driver constant current control or stepping motor drive
Input
Output
IN9
IN10
IN11
IN12
INHD
OUT9
OUT10
OUT11
OUT12
Vref
ISH
Mode
Low
Standby
High
Low
*
High
Low
High
*
Low
High
*
High
Low
High
Low
*
Low
High
Low
High
1.0V
SH & AE
High
Low
*
High
Low
High
*
Low
High
*
High
Low
High
Low
*
Low
High
Low
High
Setting
voltage
state
Hold
Low
High
0.67V
Discharged
Standby
Notes
1. "
" indicates the output off state, "*" indicates "Don't care".
2. OUT9 and OUT10 are for SH, and provide stable startup characteristics with fast charge and fast discharge circuits.
3. OUT10 and OUT11 are for AE.
4. In standby mode, the ISH pin voltage is discharged by an internal transistor and thus is set to 0V.
5. Furthermore, the ISH pin is also set to the discharged state when inputs are provided to IN1 through IN8. This is for startup
correction.
6. When INHD is low, the Vref voltage will be 1.0V, and when high, the Vref voltage will be 0.67V.
Notes on Application Design
(1) Constant current level setting (ISH, IAE, RFG1/2, and OUT9 to OUT12)
The constant current level for the OUT9/10 pair is set by the ISH input voltage and the resistor connected to RFG1. As
shown in the block diagram, the current is controlled so that the voltage generated across the current detection resistor
connected between RFG1 and ground and the ISH input voltage become equal. The output current can be determined
from the following equation.
(Output current between OUT9 and OUT10) = (ISH input voltage) ÷ (RFG1 resistance + 0.05
Ω)
The 0.05
Ω here is the shared impedance of the emitter of the output transistor that drives the constant current and the
constant current control amplifier's sensing line.
Similarly, the constant current level for the OUT11/12 pair is set by the IAE input voltage and the resistor connected to
RFG2.
Note that since the constant current control block is connected to PGND internally to the IC, if voltage is provided to
ISH and IAE through a voltage divider, the voltage divider resistor ground must be connected to PGND.
(2) Rapid charge and discharge circuits (FC1, OUT9, and OUT10)
The SH control block (OUT9/10) includes rapid charge and rapid discharge circuits to support burst (rapid sequential)
imaging.
Since this type of circuit is not included in the AE control block (OUT11/12), the OUT9/10 block must be used for
shutter drive.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB8649W-MPB-E | 功能描述:马达/运动/点火控制器和驱动器 DSC MOTOR DRIVER RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| LB8649W-TBM-E | 功能描述:马达/运动/点火控制器和驱动器 SYSTEM MOTOR DRIVER RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| LB8650T | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Driver for Digital Still Cameras |
| LB8652LP | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Driver for Digital Still Cameras |
| LB8652T | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monolithic Digital IC Driver for Digital Still Cameras |
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