LV8731V-TLM-H Просмотр технического описания (PDF) - ON Semiconductor

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LV8731V-TLM-H

PWM Current Control Stepping Motor Driver

ON Semiconductor 

LV8731V

3-4) Current limit reference voltage setting function

By setting a current limit, this IC automatically exercises short braking control to ensure that when the motor current

has reached this limit, the current will not exceed it.

(Current limit control time chart)

Set current

Coil current

Current mode

Forced CHARGE

section

fchop

Current mode CHARGE

SLOW

The limit current is set as calculated on the basis of the voltage input to the VREF pin and the resistance between the

RF pin and GND using the formula given below.

Ilimit = (VREF/5) /RF resistance

The voltage applied to the VREF pin can be switched to any of the four setting levels depending on the statuses of the

two inputs, ATT1 and ATT2.

Function for attenuating VREF input voltage

ATT1

ATT2

Current setting reference voltage attenuation ratio

Low

Low

100%

High

Low

80%

Low

High

50%

High

High

20%

The formula used to calculate the output current when using the function for attenuating the VREF input voltage is

given below.

Ilimit = (VREF/5) × (attenuation ratio) /RF resistance

Example : At VREF of 1.5V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RF resistance of

0.3Ω, the output current is set as shown below.

Ilimit = 1.5V/5 × 100%/0.3Ω = 1.0A

If, in this state, (ATT1, ATT2) has been set to (H, H), Ilimit will be as follows :

Ilimit = 1.0A × 20% = 200mA

No.A1482-19/26

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