LB1843V 查看數據表（PDF） - SANYO -> Panasonic

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LB1843V

Monolithic Digital IC Low-saturation, current-controlled bidirectional motor driver

SANYO -> Panasonic 

LB1843V

Reference voltage (Vref)

The Vref output is linked to the input; if either IN1 or IN2 is high, the reference voltage is output.

Output current limiter

The schematic for the output current limiter is shown below.

The output set current is set according to the reference voltage VLIR applied to the LIR pin. When VLIR is applied, 1/10 of that

voltage is generated at both ends of RS in the diagram; this voltage is input on the positive (+) side of the current setting

amplifier.

The motor current IM generates voltage equal to (IM × Rf) at both ends of the external resistor Rf. This voltage is input to the

negative (–) side of the same amplifier, and the differential amplifier functions and the output transistors are driven so that these

inputs become equal.

The set current value in this instance is determined by the following equation:

Ilimit = VLIR/(10Rf) [A]

Set current detector

(1) When DEL = high

If the motor current IM has not reached the set current Ilimit, the input voltage on the negative (–) side of the amplifier is

greater than the input voltage on the positive (+) side. As a result, the drive current increases and the output PNP transistors

reach the saturation state. If this state is detected, the detection signal is sent to the set current detector, and the RD output

goes high.

If the motor current IM reaches the set current Ilimit, the output PNP transistor enters the controlled state, and the RD output

goes low.

(2) When DEL = low

Because the operation of the current setting amplifier is cancelled when a low signal is input to the DEL pin, the output PNP

transistors reach the saturation state and the RD output goes high, just as in the case described above.

The following table summarizes the states described above.

DEL

OUT

RD

limit

L

H

Non-limit (saturated)

H

L

Saturated

H

Output Current Limiter and Set Current Detector Block Diagram

Set current

detector

No.4385-5/6

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