LV8804V

No.A1407-9/10

*5. CT pin

This pin is used to connect the lock detection capacitor.

The constant-current charging and constant-current discharging circuits inporporated causes locking when the pin

voltage reaches 2.5V, and releasing the lock protection when it drops to 0.5V. This pin must be connected to the GND

when it is not going to be used.

*6. RF pins

These pins are used to set the current limit.

When the pin voltage exceeds 0.25V, the current is limited, and regeneration mode is established. In the application

circuit, this voltage is set in such a way that the current limit will be established at 1A.

The calculation formula is given below.

RF resistance = 0.25V/target current limit value

All the RF pins (pins 24, 26 and 27) must be short-circuited on the print pattern.

*7. SOFTST pin

This pin is used to set the soft start.

By connecting a capacitor between this pin and GND, the motor speed can be increased gradually.

When the pin voltage exceeds 2.5V, the soft start is released, and the LV8804V is switched to normal control.

If the soft start function is not going to be used, connect the pin to the VREG pin.

*8. OSC pin

This pin is used to connect the capacitor for setting the startup frequency.

A capacitor with a capacitance ranging from about 500pF to 2,200pF (reference value) must be connected between

this pin and GND.

The OSC pin determines the motor startup frequency, so be sure to connect a capacitor to it.

<How to select the capacitance>

Select a capacitance value that will result in the shortest possible startup time for achieving the target speed and

produce minimal variations in the startup time. If the capacitance is too high, variations in the startup time will

increase; conversely, if it is too low, the motor may idle. The optimum OSC constant depends on the motor

characteristics and startup current, so be sure to recheck them when the type of motor used or circuit specifications are

changed.

*9. MINSP pin

This pin is used to input the voltage to set the minimum speed.

The minimum speed can be set by resistor-dividing the VREG voltage (5V) to create a voltage of 1 to 3V, and

inputting this voltage to the MINSP pin.

If the minimum speed is not going to be set, the MINSP pin and CTL pin (pin 8) must be short-circuited.

*10. VG, CP, and CPC pins

These pins are used to connect the capacitors to generate the pre-drive voltage and stabilize the pre-drive power

supply.

Be sure to connect these capacitors in order to generate the drive voltage for the high-side (upper) output DMOS

transistor.

*11. VREG pins

These are the control system power supply pin and regulator output pin, which create the power supply of the control

unit. Be sure to connect a capacitor between this pin and GND in order to stabilize control system operation.

Since these pins are used to supply current for control and generate the charge pump voltage, connect a capacitor with

a capacitance that is higher than that of the capacitor connected to the charge pump.

Both the VREG pins (pins 3 and 4) must be short-circuited on the print pattern.

*12. CTL

Change by the Slew Rate of 0.5V/ms or more and use the voltage of the CTL pin.

The current might return to the power supply when using it below the above-mentioned Slew Rate and IC be

destroyed.

*13. Pin protection resistor

It is recommended that resistors higher than 1kΩ are connected serially to protect pins against misconnection such as

GND open and reverse connection.