參數(shù)資料
型號(hào)： LV8741V
廠商： SANYO SEMICONDUCTOR CO LTD
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 1.75 A, PDSO44
封裝： 0.275 INCH, SSOP-44
文件頁(yè)數(shù)： 14/25頁(yè)
文件大?。?/td> 204K
代理商： LV8741V
LV8741V
No.A0814-21/25
(5) Timer latch time (Tscp)
The time to output OFF when an output short-circuit occurs can be set by the capacitor connected between the CEM
pin and GND. The capacitor (C) value can be determined as follows :
Timer latch : Tscp
Tscp
≈ Td+C × V/I [sec]
Td : Internal delay time TYP 4
s
V : Threshold voltage of comparator TYP 1V
I : CEM charge current TYP 2.5
A
The Tscp time must be set so as not to exceed 80% of the chopping period.
The CEN pin must be connected to (S) GND when the output short protection funtion is not to be used.
Charge Pump Circuit
When the ST pin is set High, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage
to the VM + VREG5 voltage. If the VG pin voltage is not boosted sufficiently, the output cannot be controlled, so be
sure to provide a wait time of tONG or more after setting the ST pin High before starting to drive the motor.
VG Pin Voltage Schematic View
When controlling the stepping motor driver with the CLK-IN input, set the ST pin High, wait for the tONG time
duration or longer, and then set the OE pin High. In addition, when controlling the stepping motor and DC motor
driver with parallel input, set the ST pin High, wait for the tONG time duration or longer, and then start the control for
each channel.
tONG
ST
OE (STM mode)
DC11, DC12, DC21 and DC22
(DCM mode)
VM+VREG5
VM+4V
VM
VG pin voltage
High after the tONG wait time has elapsed
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