M56788 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56788

5 CHANNEL ACTUATOR DRIVER

MITSUBISHI ELECTRIC  

I/O terminal equivalent circuit

(7)CH1,CH2 power I/O terminal equivalent circuit

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

VBS1

Vm1

VM

GND

MITSUBISHI <CONTROL / DRIVER IC>

M56788FP

5 CHANNEL ACTUATOR DRIVER

The equivalent circuits of an output stage of power amplifiers are

shown in(7) and(8) .

The power supplies of CH1, CH2 are Vm1.

And the power supplies of CH3, CH4, CH5 are Vm2.

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

PNP and a NPN.

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

connected to VBS1, and in the case of the CH3, CH4 and CH5, it

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

adjusted externally.

(8)CH3,CH4,CH5 power amplifier output terminal equivalent circuit

(VM3(+), VM3(-), VM4(+), VM4(-), VM5(+), VM5(-))

VBS2

Vm2

VM

GND

[About bootstrap advantage]

The output stage of the power amplifier consists of the preceding

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

Vm*(The recommendationvoltage 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.

THERMAL DERATING

6.0

(W)

5.0

4.0

3.0

2.0

1.0

3.6W using N-type board

2.6W using P-type board

0

25

50

75

100

125 150

Ambient Temperature Ta(˚C)

(˚C)

This IC's package is POWER-SSOP, so improving the board on

which the IC is mounted enables a large power dissipation without

a heat sink.

For example, using an 1 layer glass epoxy resin board, the IC's

power dissipation is 2.6W at least. And it comes to 3.6W by using

an improved 2 layer board.

The information of the N, P type board is shown in the board

information.

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