M56785FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56785FP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

ELECTRICAL CHARACTERISTICS (VCC1=5V, VCC2=12V, VM=12V, Ta=25˚C Unless otherwise noted. )

Current limit

0 – +40mV

Reverse Torque

0.6A/V

The relationship between the EC-ECR (the difference

between EC<(control voltage> and ECR <reference

voltage> ) and the torque is shown in Figure 1.

The current gain is 0.6A/V (at sensing resistor :0.5ohm)

in both torque directions, and the dead zone is from

±0mV to ±40mV.

When the all short brake mode is selected, the coil

current under the reverse torque control depends on

the back emf. and the coil resistance.

0

EC - ECR

0.6A/V

0 – -40mV

Forward Torque

Current limit

Figure 1. The characteristics of the control voltage

and motor current ( Torque ).

THERMAL DERATING

6.0

(W)

5.0

4.0

3.0

2.0

1.0

4.0W

using A-type board

3.0W

using B-type board

2.7W

using C-type board

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 2.7W at least.

And it comes to 4.0W by using an improved 2 layer

board.

The information of the H, I, J type board is shown

in the board information.

0

25

50

75

100

125

150

Ambient Temperature Ta ( )

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