lv8740v ON Semiconductor, lv8740v Datasheet - Page 20

• Manufacturer Part Number: lv8740v
• Description: Pwm Current Control Stepping Motor Driver
• Manufacturer: ON Semiconductor

(5) Timer latch time (Tcem)
Charge Pump Circuit
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 (Ccem) value can be determined as follows :
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. I will recommend the drive of the motor to put the time of tONG or more after the ST
pin is made "H", and to begin because I cannot control the output if there is no pressure voltage of the voltage of the
VG pin enough.
Timer latch : Tcem
VM+VREG5
VM+4V
VM
ST
Tcem ≈ C × V/I [sec]
VG Pin Voltage Schematic View
V : Threshold voltage of comparator TYP 1V
I : CEM charge current TYP 10μA
LV8740V
tONG
VG pin voltage
No.A1864-20/23