LV8111V

No.A1416-11/13

3-phase Logic Truth Table

(IN = “H” indicates the state where in IN+ > IN−)

F/R = H

F/R = L

Output

IN1

IN2

IN3

IN1

IN2

IN3

OUT1

OUT2

OUT3

H

L

H

L

H

L

L

H

M

H

L

L

L

H

H

L

M

H

H

H

L

L

L

H

M

L

H

L

H

L

H

L

H

H

L

M

L

H

H

H

L

L

H

M

L

L

L

H

H

H

L

M

H

L

S/S Pin

BRSEL Pin

Input state

Mode

Input state

While stopped

High or Open

Stop

High or Open

Free run

Low

Start

Low

Short-circuit brake

CSDSEL Pin

SDCC Select

Input state

Mode

Input state

Mode

High or Open

LD standard

F/R = High or Open

Function OFF

Low

FG standard

F/R = Low

Function ON

LV8111V Description

1. Speed Control Circuit

This IC can realize a high efficiency, low-jitter, a stable rotation by adopting the PLL speed control method.

This the PLL circuit compares the phase difference of the edge between the CLK signal and the FG signal and controls

by using the output of error. The FG servo frequency under control becomes congruent with the CLK frequency.

fFG (Servo) = fCLK

2. Output Drive Circuit

This IC adopts the direct PWM drive method to reduce power loss in the output. The output transistor is always

saturated while the transistor is on and adjusts the driving force of the motor by changing the duty that the output

transistor is on.

The PWM switching of the output is performed by the upper-side output transistor.

Also, this IC has a parasitic diode of the output DMOS as a regeneration route when the PWM switching is off.

But, this IC is cut down the fever than the diode regeneration by performing synchronous rectification.

3. Current Limiter Circuit

This IC limits the (peak) current at the value

I = VRF / Rf (VRF = 0.515V (typical), Rf : current detection resister)).

The current limitation operation consists of reducing the PWM output on duty to suppress the current.

To prevent malfunction of the current limitation operation when the reverse recovery current of diode is detected, the

operation has a delay (approximately 300ns). In case of a coil resistance of motor is small or small inductance, since

the current change at start-up is fast, there is a possibility that the current more than specified current is flowed by this

delay.

It is necessary to set the current increases by the delay.

4. Power Saving Circuit

This IC becomes the power saving state of decreasing the consumption current in the stop state. The bias current of the

majority circuits is cut in the power saving state. Also, 5V regulator output is output in the power saving state.

5. Reference Clock

Note that externally-applied clock signal has no noise of chattering. The input circuit has a hysteresis.

But, if noise is a problem, that noise must be excluded by inserting capacitors across the inputs.

If clock input goes to the no input state when the IC is in the start state, the drive is turned off after a few rotation of

motor if the motor constrained protection circuit does operate. (Clock disconnection protection)