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參數(shù)資料
| 型號： | LV8040FN |
| 元件分類： | 運動控制電子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 0.6 A, QCC48 |
| 封裝： | 7 X 7 MM, VQFN-48 |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 176K |
| 代理商： | LV8040FN |
LV8040FN
No.8327-7/17
Truth Table A
Input
ST1
CLK
RSTB
OE
FR
Mode
Charge pump circuit
Low
*
Standby
Stop
High
Low
CW
High
CCW
High
*
Low
High
*
Initial
High
*
Low
*
Z
Operation
CW: Forward
CCW: Reverse
Z: High impedance
*: Don't care
Truth Table B
MD
Excitation mode
Low
1-2 phase excitation
High
2W1-2 phase excitation
Initial mode
Excitation mode
Channel 1
Channel 2
1-2 phase excitation
100%
0%
2W1-2 phase excitation
100%
0%
Calculating the Set Current Value
IOUT = (reference voltage × set current ratio)/(sensing resistance)
Since the reference voltage is 0.2V, with a set current ratio of 100% and a 1
Ω sensing resistor, the output current will be
as follows.
IOUT = 0.2 × 100%/1Ω
= 200mA
To change the output current, change the value of the sensing resistor.
Setting the Chopping Frequency
When this IC performs constant current control, it performs a chopping operation at a frequency set by an external
resistor.
The value of the resistor connected to the R pin (pin 31) sets the chopping frequency as shown in the figure below.
Recommended chopping frequency : 50kHz to 200kHz
Resistance, R -
Ch
opp
in
g
Fre
que
ncy
,
k
Ω
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