TDA1154.PDF

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SPEED REGULATOR FOR DC MOTORS
TDA1154
SPEED REGULATOR FOR DC MOTORS
MATCHING FLEXIBILITY TO MOTORS WITH
VARIOUS CHARACTERISTICS
BUILT-IN CURRENT LIMIT
ON-CHIP 1.2V REFERENCE VOLTAGE
STARTING CURRENT: 0.5 A @ 2.5V
REFLECTION COEFFICIENT K = 20
Minidip
DESCRIPTION
The TDA1154 is a monolithic integrated circuit in-
tended for speed regulation of permanent magnet
dc motors used in record players, tape recorders,
cassette recorders and toys.
The circuit offers an excellent speed regulation with
much higher power supply, temperature and load
variations than conventional circuits built around
discrete components.
ORDERING NUMBER : TDA1154
Figure 1. Application circuit
V CC =12V
R m = 14.7
W
R t = 290
W
(total)
E g = 2.65 V
I m = 110 mA
W
3 : Ground
5 : Reference
8 : Output
Other pins are not connected
March 1993
1/6
R S =1k
311057370.002.png
TDA1154
PIN CONNECTION (Top view)
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V CC
Supply voltage
20
V
I O
Output current
1.2
A
P tot
Power dissipation
(see curve)
W
T j
Junction temperature
+150
C
T stg
Storage temperature range
-55 to +150
C
Figure 2. Test circuit
THERMAL DATA
Symbol
Parameter
Value
Unit
R th-j-amb
Thermal resistance junction-ambient
max
100
°
C/W
Rt hj-amb
Thermal resistance junction-pin 4
max
70
° C/W
2/6
°
°
311057370.003.png
TDA1154
ELECTRICAL CHARACTERISTICS T amb = +25 ° C (Unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V (ref)
Reference voltage
V CC = +6V
I(8) = 0.1A
1.15
1.25
1.35
V
D
V ( ref )
V ( ref )
/D
T
Reference voltage
temperature coefficient
V CC = +6V I(8) = 0.1A
T amb = -20
-
0.02
-
%/
°
C
°
C to +70
°
C
D
V ( ref )
V ( ref )
/D
V CC
Line regulator
V CC = +4V to +18V
I(8) = 0.1A
-
0.02
-
%/V
D V ( ref )
V ( ref )
/D |(
8
)
Load regulator
V CC = +6V
l(8) = 25 to 400 mA
-
0.009
-
%/mA
V (5 - 3)
Minimum supply voltage
| ( 8 )= 0.1A D V ( ref )
V ( ref )
=-
5%
2.5
-
-
V
I(8)
Starting current(*)
V ( ref )
V ( ref )
=-
50%
V CC = +5V
1.2
-
-
A
V CC = +2.5V
0.5
0.8
-
I O (5)
Quiescent current on pin 5
V CC = +6V
I(8) = 100
m
A
-
1.7
-
mA
K
K
=
D|(
)
reflection
coefficient
V CC = +6V
I(8) = 0.1A
18
20
22
D|(
)
D
K
K /D V CC
K spread versus V CC
V CC = +6V to +18V
I(8) = 0.1A
-
0.45
-
%/V
D
K
K /D|(
8
)
K spread versus I(8)
V CC = +6V
I(8) = 25 to 400 mA
-
0.005
-
%/mA
D
K
K /D
T
K spread versus temperature
V CC = +6V I(8) = 0.1A
T amb = +20
-
0.02
-
%/
°
C
°
Cto+70
°
C
(*) An internal protection circuit reduces the current if the temperature of the junction increase: I(8) = 0.75A at T j = +140 ° C
OPERATING MODE
Figure 3
The circuit maintains a 1.2V costant reference volt-
age between pins 5 and 8:
V(5 - 8) = V (ref) = 1.2V
The current (I(5)) drawn by the circuit at pin 5 is
sum of two currents.
One is constant: I O (5) = 1.7mA and the other is
proportional to pin 8 current (I(8)):
I(5) = I O (5) +I(8)K(a)
(I O (5) = 1.7mA, K = 20)
3/6
D
8
5
311057370.004.png
TDA1154
If E g and R m are motor back electromotive force and
motor internal resistance respectively, then:
The motor speed will be independent of the resist-
ing torque if E g is also independentof I m . Therefore,
in order to determine the value of R t term(1) in (d)
must be zero:
E g
+
R m I m
=
R t [I ( 5 )+
V ( ref )
R S
]
+
V ( ref ) ( b )
R t
=
KR m ( K = 20 )
From figure 2 it is seen that:
> KR m , an instability may occur as a result of
overcompensation.
The value of R S is determinated by term (2) in (d)
so as to obtain he back electromotive force (E g )
corresponding to required motor speed:
I ( 8 ) =
I m
+
V ( ref )
R S
( c )
Subsituting equations (a) and (c) into (b) yields:
R t
K -
R S
=
R t
V ( ref )
( 1 + 1 / K )
@
E g
=
I m [
R m ]
+
E g
-
V ( ref ) -
R t I O
( 5 )
@
R t
V ( ref )
(1)
E g
-
V ( ref )
-
R t I O
( 5 )
R t
R s
1
K
Where V (ref) = 1.2V and I O (5) = 1.7 mA
+
V ( ref )
[
(
1
+
)+
1 ]
+
R t I O
(
5
)(
d
(2)
Figure 4. Application circuit
4/6
If R t
)
311057370.005.png
TDA1154
MINIDIP PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
3.32
0.131
a1
0.51
0.020
B
1.15
1.65
0.045
0.065
b
0.356
0.55
0.014
0.022
b1
0.204
0.304
0.008
0.012
D
10.92
0.430
E
7.95
9.75
0.313
0.384
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
6.6
0.260
I
5.08
0.200
L
3.18
3.81
0.125
0.150
Z
1.52
0.060
5/6
311057370.001.png

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