M56782FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M56782FP

4 CHANNEL ACTUATOR DRIVER

MITSUBISHI ELECTRIC  

I/O TERMINAL EQUIVALENT CIRCUIT

(5) CH1,CH2 power amplifier output terminal

equivalent circuit

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

GND

MITSUBISHI <CONTROL / DRIVER IC>

M56782FP

4 CHANNEL ACTUATOR DRIVER

VBS1 The equivalent circuits of an output stage of the power amplifiers

are shown in (5) and (6).

Vm1

The power supplies of CH1, CH2 are Vm1.

And the power supplies of CH3, CH4 are Vm2.

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

PNP and a NPN.

VM

In the case of the CH1 and CH2, the emitta of the PNP is

connected to VBS1, and in the case of the CH3 and CH4, it is

connected to VBS2. So the power of the PNP supplies can be

adjusted externally.

(6) CH3, CH4 power amplifier output terminal

equivalent circuit

(VM3(+), VM3(-), VM4(+), VM4(-))

GND

About bootstrap advantage

VBS2

The output stage of the power amplifiers consists of the preceding

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

Vm2

(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

VM

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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