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PDF AN6657 Data sheet ( Hoja de datos )
| Número de pieza | AN6657 | |
| Descripción | Micromotor Forward/ Reverse Electronic Governors | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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ICs for Motor
AN6657, AN6657S
Micromotor Forward/ Reverse Electronic Governors
s Overview
The AN6657 and the AN6657S are the electronic gov-
ernors capable of controlling the forward/reverse speed,
fast forward, rewind, and start/stop of the micromotors
used for the radio/cassette tape recorders, automatic an-
swering telephone sets, and so on.
s Features
• Wide operating supply voltage range ; VCC =4.5V to
14V
• Stable reference voltage (1.3V) and easy speed control
• Large starting torque and maximum control torque
• Good secular drift because of external power transistor
• Provided with the motor stop function ; ICC =20µA or
less at stop time
• Capable of controlling forward/reverse rotation, fast for-
ward/constant speed, and start/stop via 3 input pins
s Applications
• Speed control of the micromotors for the radio cas-
settes
• Speed control of the micromotors for the microcas-
settes of the automatic answering telephone sets
• Control of the tape loading motors for the DATs, etc.
AN6657
Unit : mm
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
6.3±0.25
0.51min.
3.8±0.25 (3.45)
3 ~ 15˚ 7.62±0.25
0.3+–00.1.05
16-Lead DIP Package (DIP016-P-0300E)
AN6657S
Unit : mm
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
s Block Diagrom
16 15 14
Drive Mode
Swiching Logic
GND
VCC
13 12 11 10
9
Ref.Voltage
Amp.
For./Rev.
1kΩ Drive Circuit
10kΩ
12345678
0.3
4.2±0.3
6.5±0.3
16-Lead SOP Package (SOP016-P-0300)
1 page  
ICs for Motor
AN6657, AN6657S
As it is clear from the expression (4), r1r2/r3 – Ra = 0, that is,
when r1 = r3/r2÷Ra is established, Ea (∝ motor speed N)
becomes a constant value without depending on the motor
current Ia (load torque T). This is also true for the expression
(5).
• Switching the Various Modes
The AN6657 and the AN6657S have five motor drive
modes as shown in Table 1. Those modes can be selected
depending on the voltage H (3V to 6V) and voltage L (0V to
0.7V) signals applied to the input pins14, 15 and 16.
1) Forward/reverse switching : Forward/reverse rotation is
switched over whether a current flows from the pin5 to
the pin8 (forward rotation) or vice versa (reverse
rotation).
2) Power-off (pause) mode : turning off the constant current
source inside the IC stops a current to the motor and stops
motor. In this mode, all the transistors of the IC are turned
off and only a leak current (20µA) is available.
3) Setting the motor speed
The motor speed at constant speed time can be expressed
by the expression (4).
VREF
r2+r3
r3
·
r5
r4 · r6
r4+r6
+ r5
In the FF (REW) mode, the pin2 is turned on and the first
term of the expression (4) is ;
Ea =VREF
r2+r3
r3
·
r5
r4 · r6
r4+r6
+
r5
+
r1r2
r3
– Ra
Ia
+ VCE SAT
(6)
and the motor speed N (motor generated voltage Ea) is
expressed as follows.
From the expression (4), the motor speed at constant speed
can be controlled with r4 and r5 (external VRs).
From the expression (6), the motor speed at the FF (REW)
mode can be controlled with r6.
• Setting the External Resistor r1
The torque control resistance r1 is important in setting the
motor rotating state. Select the resistance which satisfies the
condition of the expression (7) within a working temperature
range. If this condition is not satisfied, the motor may have
abnormal rotation such as hunting, etc.
r1 <≈
r3
r2
Ra
(r3/r2 = 1/10 for the AN6657, AN6657S)
(7)
Ra is the copper coiled resistor of the motor and has the
temperature characteristics of + 3,900r.p.m/˚C, Therefore, it
is necessary to set the value of r1 so that the relationship in
the expression (7) will be satisfied at the minimum working
temperature. The diffusion resistance r3/r2 in the IC has the
flat temperature characteristics, and if the temperature
characteristics of r1 is adjusted to that of Ra, + 3900 r.p.m/˚C,
the value of the second term (r1r2r – Ra) of the expressions
(4) and (5) shows the flat temperature characteristics and the
torque characteristics of the motor speed becomes constant
without depending on a temperature. Fig. 2 and Fig. 3 show
this relationship.
Low Temperature
Normal Temperature
High Temperature
TM (Torque)
Fig. 2 r1 Temperature Characteristics < Ra Tempera-
ture Characteristics
Pin14
L
H
H
H
H
Input
Pin15
—
H
L
H
L
Table 1 AN6657/AN6657S Mode Switching Table
Pin16
—
L
L
H
H
Pin5 Motor +
—
H
L
H
L
Output
Pin8 Motor –
—
L
H
L
H
Pin2
OFF
OFF
OFF
ON
ON
Motor Drive Mode
Power OFF (pause)
Forward (constant speed)
Reverse (constant speed)
FF
REW
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN6657.PDF ] | |
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