LV8731V-TLM-H Ver la hoja de datos (PDF) - ON Semiconductor

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LV8731V-TLM-H

PWM Current Control Stepping Motor Driver

ON Semiconductor 

LV8731V

4. Output short-circuit protection function

This IC incorporates an output short-circuit protection circuit that, when the output has been shorted by an event such

as shorting to power or shorting to ground, sets the output to the standby mode and turns on the warning output in

order to prevent the IC from being damaged. In the stepping motor driver (STM) mode (DM = Low), this function

sets the output to the standby mode for both channels by detecting the short-circuiting in one of the channels. In the

DC motor driver mode (DM = High), channels 1 and 2 operate independently. (Even if the output of channel 1 has

been short-circuited, channel 2 will operate normally.)

4-1) Output short-circuit protection mode switching function

Output short-circuit protection mode of IC can be switched by the setting of EMM pin.

EMM

State

Low or Open

Latch method

High

Auto reset method

4-2) Latch type

In the latch mode, when the output current exceeds the detection current level, the output is turned OFF, and this state

is held.

The detection of the output short-circuited state by the IC causes the output short-circuit protection circuit to be

activated.

When the short-circuited state continues for the period of time set using the internal timer (approximately 2μs), the

output in which the short-circuiting has been detected is first set to OFF. After this, the output is set to ON again as

soon as the timer latch time (Tcem) described later has been exceeded, and if the short-circuited state is still detected,

all the outputs of the channel concerned are switched to the standby mode, and this state is held.

This state is released by setting ST to low.

H-bridge

output state

Output ON

Output OFF

Output ON

Standby state

Threshold voltage

2μs

CEM voltage

Short-circuit

detection state

Short- Release

circuit

Short-circuit

Internal counter

1st counter 1st counter 1st counter

start

stop

start

1st counter

end

2nd counter 2nd counter

start

end

No.A1482-21/26

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