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PDF M54687FP Data sheet ( Hoja de datos )
| Número de pieza | M54687FP | |
| Descripción | Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de M54687FP (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
DESCRIPTION
The M54687FP is a semiconductor integrated circuit that is
capable of directly controlling the rotating direction and rotating
speed of a smallsize bi-directional motor rotating in both forward
and reverse directions.
FEATURES
q Capable of controlling the speed in forward and reverse rotating
directions
q Capable of controlling the speed in high speed mode
q Large output current drive (IO(max) =700mA)
q Built-in clamp diode
q Flat package (16P2N )
APPLICATION
Micro-cassette for phone-answering machine, AV equipment, and
other general consumption appliances
FUNCTION
The M54687FP is an IC that can control the forward rotation,
reverse rotation and speed of small DC brush motor.
For the basic operation of this IC, output modes are selected, as
shown in the logic truth table, by entering appropriate H/L level into
the R, L and S inputs.
Two resistances are put between the output pin and the PSC pin
and the resistance ratios are appropriately adjusted to perform the
speed control.
In addition to the above, speed control can be done by varying the
voltage at VR pin, in the high speed mode.
PIN CONFIGURATION (TOP VIEW)
Speed control 1 PSC1
R input
R
S input
S
GND
L input
L
Power supply L-VCC
Speed control 2 PSC2
1
2
3
4
5
6
7
8
16 P-VCC Power supply
15 O1 Output 1
14 VR High speed
control
13
GND
12
11 NC
10 O2 Output 2
9 P-VCC Power supply
Outline 16P2N-A
NC: no connection
LOGIC TRUTH TABLE
Input Output
Mode
R L S O1 O2
H H H H FG FF
Forward rotation high speed governor
H L H H G PLAY Forward rotation governor
L H H FG H REW Reverse rotation high speed governor
L L H G H REV Reverse rotation governor
H H L L L BRAKE Brake operation
L L L OFF OFF STB
HL L
LH L
Standby mode output high imp.
Reserved
G: Governor control output mode
FG: Rotating speed controllable with the voltage at VR pin (However, the
precision is worse than G.)
BLOCK DIAGRAM
Speed control 1
PSC1
High Speed
control
VR 14
1
Output 1
O1
15
Output 2
O2
10
Speed control 2 Power supply
PSC2
VCC
8 7 9 16
(–)
Activation circuit
(–)
Control circuit
2
R
R input
6
L
L input
3
S
S input
4 5 12 13
GND
1 page  
MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
Speed Control Method
(1) Speed Control Method I (See the application circuit drawing.)
For PLAY/REV
Rotation number can be expressed by the following formula:
N=
1
Ka
{IB
•
RT+Vref (1+
RT )+la(
RT+RS
RT
K
-Ra)}•
•
•
•
•
•
(1)
Where:
Motor generation constant: Ka, Motor armature resistance: Ra,
Rotation number: N
K: Current proportional constant, IB: PSC pin bias current,
Ia:motor current
RT, RS: External resistance
In addition, to set the rotation number with RS, external
resistance RT is generally set as follows:
RT K x Ra
For FF/REW
Note that the rotation number is basically controlled with the
same expression as formula (1) but different reference voltage
Vref and different bias current IB are to be used.
However, Vref = 5VR+0.5
(2) Speed Control Method II (to increase the motor rotation number)
(3) Speed Control Method III (to increase the precision of forward
rotation and reverse rotation)
RS1 RT1
RT2 RS2
M
PSC1 O1
O2 PSC2 VR
VCC
RL
S
L-G P-G
RS
RT
M
RT
PSC1 O1
O2 PSC2
VR
VCC
RL
S
Control signal
L-G P-G
Control signal
The above two applications cannot make fine adjustments in
forward rotation and reverse rotation (because the external
resistance is shared with the forward rotation and reverse rotation).
Fine adjustments can be made for each of forward rotation and
reverse rotation if the external circuit is set as shown in the drawing
above.
This external circuit is also available to change the speed of
forward and reverse rotation.
The control method adopts the same formula as formula (1).
However, the following relations must be satisfied:
RT+RS RS1 or RS2
RT RT1 or RT2
In the external circuit above, the voltage across motors is almost
determined by the ratio of ‘RS+RT’ to ‘RT’ and, therefore, a value
set for the voltage across motors is not so large.
As method (1) of speed control I, the rotation number can be
controlled.
However, the following relations must be satisfied:
RT RT+RS
RS+RT RT
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet M54687FP.PDF ] | |
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