M56783 데이터 시트보기 (PDF) - Mitsumi

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M56783

3 CHANNEL ACTUATOR DRIVER

Mitsumi 

I/O TERMINAL EQUIVALENT CIRCUIT

(7) CH1,CH2 power amplifier output terminal equivalent circuit

(VM1+, VM1-, VM2+, VM2-)

VBS

Vm12

VM*

GND

MGND12

MITSUBISHI <CONTROL / DRIVER IC>

M56783AFP

3 CHANNEL ACTUATOR DRIVER

The equivalent circuits of an output stage of the power amplifiers

are shown in (7).

The power supplies of CH1, CH2 are Vm12.

And the power supplies of CH3 are Vm3.

The source side of the power amplifier output stage consists of a

PNP and a NPN.

The emitta of the PNP is connected to VBS. So the power of the

PNP supplies can be adjusted externally.

(8) CH3 power amplifier output terminal equivalent circuit

(VM3+, VM3-)

VBS

Vm3

VM3*

GND

About bootstrap advantage

The output stage of the power amplifiers consists of the preceding

components. If VBS is provided with higher voltage input than Vm*

(The recommendation voltage is Vm+1V) externally, the output

range can be wider than that of VBS = Vm.

Please take advantage of this bootstrap function for the system

which has many power supplies. And it is the same with the

external bootstrap circuit which provides VBS with higher voltage

inputs than Vm*.

Also the bootstrap can decrease the saturation voltage at the

source side of the power amplifier output stage. Therefore, when

the outputs of the power amplifiers which drive motors and

actuators are fully swung, the power dissipation of the IC will be

decreased.

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