M56784 Mitsubishi, M56784 Datasheet - Page 4

• Manufacturer Part Number: M56784
• Description: SPINDLE MOTOR DRIVER
• Manufacturer: Mitsubishi

ELECTRICAL CHARACTERISTICS
(V
Figure 1. The characteristics of the control voltage and motor current (Torque).
THERMAL DERATING
CC
(W)
6.0
5.0
4.0
3.0
2.0
1.0
1=5V, V
0
Forward Torque
CC
2=12V, VM=12V, Ta=25 C Unless otherwise noted.)
25
Current limit
0 – +40mV
0.6A/V
50
Ambient Temperature Ta (
0
75
0 – -40mV
0.6A/V
Current limit
Reverse Torque
2.9W using J-type board
4.1W using H-type board
3.1W using I-type board
100
)
EC - ECR
125
150
MITSUBISHI <CONTROL / DRIVER IC>
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.
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 2.9W
at least. And it comes to 4.1W by using an
improved 2 layer board.
The information of the H, I, J type board is
shown in the board information.
SPINDLE MOTOR DRIVER
M56784FP