Document
MITSUBISHI
M56784FP
SPINDLE MOTOR DRIVER
DESCRIPTION
The M56784FP is a semiconductor integrated circuit in order to drive the spindle motor.
PIN CONFIGURATION (TOP VIEW)
N.C W V U RS MODE3 MODE4
1 2 3 4 5 6 7 8 9
42 41 40 39 38 37 36 35 34
N.C S/S RDS FG CI MODE2 MODE1
FEATURES
q Large power dissipation (Power Package). q 3.3V DSP available. q The supply voltage with wide range. q High motor drive current. q Low saturation voltage. (typical 1.2V at load current 500mA) q Motor current control for both motor torque directions. q Reverse torque mode select [SHORT BRAKING, etc]. q Sleep mode. (Zero total current) q Hall amplifier sensitivity select. (Minimum voltage: 35mVp-p or 50mVp-p) q FG signal output terminal. q Automatic stop select. (Removable function) q Reverse detected signal pin.
M56784FP
10
GND
33 32 31 30 29 28 27 26 25 24 23 22
VM VCC2 EC ECR VCC1 HB N.C GND
11 12 13 14
APPLICATION
CD-ROM, DVD, DVD-ROM, DVD-RAM etc.
HwHw+ HvHv+ HuHu+ N.C
15 16 17 18 19 20 21
Outline 42P9R-D
N.C: no connection
BLOCK DIAGRAM
U 4 V 3 W 2 S/S 41 RS 5 VCC1 24
VM VCC2
28 27 ++ Vref 8 to 14
MODE1
36
MODE2
37
BRAKING MODE CHANGE
I/I Converter 120° MATRIX
GND
29 to 35
GND
MODE4
7
SENSE TSD
MODE3 FG RDS
6 39 40 20 Hu+ 19 Hu18 Hv+ 17 Hv16 Hw+ 15 Hw23 HB CI 38 FG RDS + + + Hall Bias
V/I Converter
26 EC
25 ECR
MITSUBISHI
M56784FP
SPINDLE MOTOR DRIVER
PIN DESCRIPTION
Pin No.
1 2 3 4 5 6 7 8
Symbol N.C W V U RS MODE3 MODE4 GND HwHw+ HvHv+ HuHu+ N.C
Function — Motor drive output W Motor drive output V Motor drive output U Motor current sense Automatic stop select Hall amplifier sensitivity select GND Hw- Sensor amp. input Hw+ Sensor amp. input Hv- Sensor amp. input Hv+ Sensor amp. input Hu- Sensor amp. input Hu+ Sensor amp. input —
24
Pin No.
22 23 24 25 26 27 28 29
Symbol N.C HB VCC1 ECR EC VCC2 VM GND MODE1 MODE2 CI FG RDS S/S N.C
Function — Bias for Hall Sensor 5V supply voltage The reference voltage for EC Motor speed control 12V supply voltage Motor supply voltage GND Reverse torque mode select 1 Reverse torque mode select 2 Phase Compensation Frequency generator output Reverse detected signal Start / Stop —
– 14
15 16 17 18 19 20 21
–
36 37 38 39 40 41 42
35
*Pull-up resistors (10kohm) are included in the circuits connected to
pin[RDS] and 25 pin[FG].
ABSOLUTE MAXIMUM RATING (Ta = 25°C)
Symbol VM VCC2 VCC1 Io VH(c) Pt Kθ Tj Topr Tstg Parameter Motor supply voltage 12V supply voltage 5V supply voltage Output current Sensor amp. Differential input range Power dissipation Thermal derating Junction temperature Operating temperature Storage temperature pin pin 24 pin *note 1
28 27 15
Conditions
Rating 16 16 7.0 1.5
Units V V V A V W mW/°C °C °C °C
–
20
pins
4.5 1.2 9.6 150 -20 – +75 -40 – +125
Free Air Free Air
*Note1. The ICs must be operated within the Pt (power dissipation) or the area of safety operation.
MITSUBISHI
M56784FP
SPINDLE MOTOR D.