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LV8771VH Datasheet(PDF) 7 Page - ON Semiconductor |
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LV8771VH Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 13 page LV8771VH No.A2056-7/13 Description of operation Input Pin Function The function to prevent including the turn from the input to the power supply is built into each logic pin. Therefore, the current turns to the power supply even if power supply (VM) is turned off with the voltage impressed to the input pin and there is not crowding. (1) Chip enable function This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not operate in standby mode. ST Mode Internal regulator Charge pump Low or Open Standby mode Standby Standby High Operating mode Operating Operating (2) Output control logic I01(02) I11(12) Output current (IO) Low Low 0 High Low IO = (( VREF / 5 ) / RF ) × 40% Low High IO = (( VREF / 5 ) / RF ) × 70% High High IO = ( VREF / 5 ) / RF PH1(2) Current direction Low OUTB → OUTA High OUTA → OUTB (3) Setting constant-current control reference current This IC is designed to automatically exercise PWM constant-current chopping control for the motor current by setting the output current. Based on the voltage input to the VREF pin and the resistance connected between RF and GND, the output current that is subject to the constant-current control is set using the calculation formula below: IOUT = (VREF / 5) / RF resistance * The above setting is the output current at I01(02) = High, I11(12) = Low. (Example) When VREF = 1.5V, I01(02) = High, I11(12) = Low and RF1(2) resistance is 0.5Ω, the setting current is shown below. IOUT = (1.5V / 5) / 0.5Ω = 0.6A (4) Chopping frequency control logic FC Chopping frequency Low 31kHz High 62kHz (5) Blanking period If, when exercising PWM constant-current chopping control over the motor current, the mode is switched from decay to charge, the recovery current of the parasitic diode may flow to the current sensing resistance, causing noise to be carried on the current sensing resistance pin, and this may result in erroneous detection. To prevent this erroneous detection, a blanking period is provided to prevent the noise occurring during mode switching from being received. During this period, the mode is not switched from charge to decay even if noise is carried on the current sensing resistance pin. The blanking time is fixed at approximately 1 μs. |
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