m56786fp Mitsumi Electronics, Corp., m56786fp Datasheet - Page 8

• Manufacturer Part Number: m56786fp
• Description: Spindle Motor Actuator Driver
• Manufacturer: Mitsumi Electronics, Corp.

I/O CHARACTERISTICS of ACTUATOR DRIVE PART
Figure 8.
The power amplifiers of CH1 is shown in Figure 8.
The power supplies is V
connected to GND(0V). Also, it is possible to be connected to other
power supply larger than 0 volts (ex:5V).
The source side of the power amplifier output stage consists of a
PNP and a NPN. The emitta of the PNP is connected to V
the power of the PNP supplies can be adjusted externally.
1.65V
GND
Reference 1.65V
IN-
IN+
20K
20K
DD
Input Buffer
+ and V
+
-
DD
Vrefm Amp.
-. Generally, the V
6K
6K
6K
6K
24K
24K
24K
24K
+
+
-
-
Vrefm
DD
CC
- pin is
(OUT+
2. So,
OUT-)
V
V
V
CC
DD
DD
V
VM+
VM-
V
2
+
-
DD
DD
+
-
SPINDLE MOTOR AND 1CH ACTUATOR DRIVER
1.65V
Vrefm
<OUTPUT>
<INPUT>
CH1 power amplifier output terminal equivalent circuit
MITSUBISHI <CONTROL / DRIVER IC>
0.8V
0.2V
0.8V
Vrefm= [(V
VM+
Gain=x8
DD
IN+
+)+(V
DD
M56786FP
-)] / 2
VM-