lv8762t Sanyo Semiconductor Corporation, lv8762t Datasheet - Page 9

• Manufacturer Part Number: lv8762t
• Description: Forward/reverse H-bridge Driver
• Manufacturer: Sanyo Semiconductor Corporation

5.Setting the current limit value
6. Setting the mask of current limit
7. Setting the time of the mask of current limit
The current limit value of the DCM driver is determined by the VREF voltage and the resistance (RNF) connected
across the RNF and GND pins using the following formula :
Assuming VREF = 1.5V, RNF = 1Ω, the current limit is :
set low.
This function can be switched by CMK pin.
This function can prevent the current limit from working by the motor start-up current when the current limit value is
This IC can set the time of the mask of current limit by connection the capacitor with CMK-GND.
The value of the capacitor is decided according to the following expression.
Time of mask:T CMK ≈ C CMK × Vt CMK ÷ I CMK [sec]
ex. C CMK =0.1[μF]
T CMK [sec] = 0.1[μF] x 1.5[V] ÷ 25[μA] = 6[ms]
“H” or OPEN
CMK
“L”
Ilimit [A] ≈ (VREF [V] ÷5) ÷RNF [Ω])
Ilimit = 1.5V÷5÷1Ω = 0.3A
Vt CMK :CMK comparator threshold voltage. TYP=1.0[V]
I CMK :CMK charge current. TYP=25[μA]
mask of current limit
no operation
operation
LV8762T
No.A1926-9/13