mm1469 Mitsumi Electronics, Corp., mm1469 Datasheet - Page 7

• Manufacturer Part Number: mm1469
• Description: 4-ch Btl Motor Driver For Cd Players
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
Application Circuit
Precautions for use
(1) A thermal shut down circuit is built. When the temperature of the chip reaches 175ºC typ., the output
(2) If the mute (7PIN) voltage is open or is less than 0.5V, the output current is muted. Under normal operating
(3) If the bias pin (23PIN) drops below 1.4V, the output current is muted. Make sure that under normal
(4) If the power supply voltage drops below 4.5V typ., the drivers are turned OFF. When the voltage exceeds
(5) The channel 4 output is muted in the event of a thermal shut down, mute on, bias pin voltage drop.Other
(6) The built-in input resistance has a positive temperature coefficient of 1500ppm/ºC. When changing the
(7) Make sure to connect a 0.47µF capacitor to the IC input to filter out voltage ripple.
(8) Heat dissipation fins are attached to the GND on the inside of the package. Make sure to connect these to
(9) The capacitor connected between the regulator output (6PIN) and the GND also serves to stop oscillation
current is muted.
conditions, make sure to pull pin (7PIN) above 2.0V.
operating conditions, this pin is at 1.6V or above.
4.7V typ., the drivers return to their previous state.
sections are not muted. When muted, the internal bias voltage of the output pin becomes (roughly (V
gain using an external resistance, the gain will change as the temperature of the resister changes. When
using the built-in input resistance, there are virtually no gain variation due to temperature.
the external GND.
of the IC circuit. Consequently, make sure to use one with good temperature characteristics.
FOCUS
28
1
ACT
TRACKING
27
2
ACT
26
3
2SB1237
to Vcc
25
4
24
5
5V REGULATOR OUT
S E R V O
M M 1 4 6 9 X H
23
6
22
7
22µF
MUTE
OFF-HIGH
ON-LOW
P R E
4-ch BTL Motor Driver for CD Players MM1469
21
A M P
8
to V
20
CC
9
19
10
SPINDLE
18
11
MOTOR
MOTOR
SLED
M
M
17
12
16
13
15
14
CC
-VF)/2).