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| 型號： | LC8650T |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | 0.225 INCH, TSSOP-24 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 69K |
| 代理商： | LC8650T |
LB8650T
No.7895-4/6
Application Example
(1) Solenoid (constant current drive), stepping motor (constant voltage drive)
Timing chart for solenoid SH
(1) ICI pin voltage is set to 0V in shutter ready mode of *LLLH input.
(2) At *LLHH input, solenoid is driven by constant current control. The ICI pin input voltage is set with the decay
time constant to be larger than the coil decay time constant by using the external CR and the rise correction
occurs with respect to the coil wave. By doing this, stable shutter operation can be carried out with respect to the
power source variations.
(Note) ICI pin rise compensation is made without C1 and the rise waveform of coil current is made at decrease of VB
power. C1 is set to the time constant lower than this waveform.
(3) At *HLHH input, solenoid current is controlled by 2/3, and it becomes HOLD state.
Constant current value setting: ICI voltage/Rf
(Note1) Consider the FC capacitor between 0.01 to 0.1
F to set the capacitance value that ensure no oscillation
problem at transfer to the HOLD mode. In particular, the solenoid with high inductance should have an
allowance for capacitance.
Vref
R1
ICI
R2
C1
FC
0.01 to 0.1
F
RFG
Rf
SH/SOL
OUT5N
VB
VC1
P-GND
VB
OUT1
OUT2
OUT4
OUT3
AF/STP
0.01
F
ILB01606
ICI
Rise correction
VB is high. (Without C1)
SH
preparing
SH closing operation
SH closing HOLD
VB is low. (Without C1)
Rise correction coil current
SOL/IO
ILB01607
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