參數(shù)資料
型號(hào)： LV8743V
元件分類： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO44
封裝： 0.275 INCH, SSOP-44
文件頁數(shù)： 5/21頁
文件大?。?/td> 268K
代理商： LV8743V
LV8743V
No.A0612-13/21
Stepping Motor Driver
(1) STM output control logic
Parallel input
Output
PS
PHA
OUTA
OUTB
Current direction
Low
*
Off
Standby
High
Low
High
OUTB
→OUTA
High
Low
OUTA
→OUTB
(2) STM constant-current settings
I0
I1
Output current
High
(VREF1/5) /RNF = IO (100%)
Low
High
((VREF1/5) /RNF)
× 2/3 = IO (100%) × 2/3
High
Low
((VREF1/5) /RNF)
× 1/3 = IO (100%) × 1/3
Low
0
The STM driver constant-current control settings consist of the VREF1 voltage setting, the I0 and I1 current settings,
and the resistor (RNF) connected between RNF and ground. The current is set according to the following equation.
Iconst [A] = ((VREF1 [V] /5) /RNF [
]) × attenuation ratio
Here VREF1 = 1.5V, I0 = I1 = high, and RNF = 1
. Iconst can be determined from the following equation.
Iconst = 1.5V/5/1
× 1 = 0.3A
(3) Procedure for setting the CR pin constants (the off period and noise canceller time settings)
The following are set by connecting a capacitor and resistor to the CR pin.
(a) The switching off time (Toff) in constant-current control mode
(b) The noise cancellation time (Tn) used to prevent malfunctions due to spike noise when switching from decay to
charge mode.
Use the following equations to determine the values for the capacitor and resistor.
(a) Switching off time (Toff)
Toff
≈ -C×R×ln (1.5/4.8) [sec]
(b) Noise cancellation time (Tn)
Tn
≈ C×R×ln {(1.5 - RI)/(4.0 - RI)} [sec]
I : The CR pin charge current (1.25mA, typical)
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LV8743V 0.8 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO44
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