TDA7275A
May 1997
MOTOR SPEED REGULATOR
.
EXCELLENT VERSATILITY IN USE
.
HIGH OUTPUT CURRENT (up to 1.5 A)
.
LOW QUIESCENT CURRENT
.
LOW REFERENCE VOLTAGE (1.32 V)
.
EXCELLENT PARAMETERS STABILITY VER-
SUS AMBIENT TEMPERATURE
.
START/STOP FUNCTION (TTL levels)
.
DUMP PROTECTION
DESCRIPTION
MINIDIP
(4 + 4 )
ORDERING NUMBER : TDA7275A
The TDA7275A is a linear integrated circuit in mini-
dip plastic package. It is intended for use as speed
regulator for DC motors of record players, tape and
cassette recorders.
The dump protection make it particularlysuitablefor
car radio applications.
PIN CONNECTION (top view)
1/9
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
19
V
V
S
Peak Supply Voltage (for 50ms)
45
V
I
M
Maximum Output Current
1.5
A
T
op
Operating Temperature Range
30 to +85
C
P
tot
Power Dissipation at T
amb
= 70
C
at T
pins
= 70
C
1
4
W
W
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
R
th j-pins
Thermal Resistance Junction-ambient
Max.
Thermal Resistance Junction -pins
Max.
80
20
C/W
C/W
TDA7275A
2/7
ELECTRICAL CHARACTERISTICS (Refer to test circuit, V
S
= 12V, T
amb
= 25
C unless otherwise
specified, refer to test circuit)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage Range
8
18
V
V
ref
Reference Voltage
I
M
= 0.1A
1.05
1.22
1.35
V
I
q
+ I
d
Total Quiescent Current
I
M
= 0.1mA
2
mA
I
d
Quiescent Current
I
M
= 0.1mA
1
mA
I
ms
Starting Motor Current
V
ref
V
ref
=
50%
1
A
V
4
Saturation Voltage
I
M
= 0.5A
1.7
2
V
K = I
M
/I
T
Reflection coefficient
I
M
= 0.1A
18
20
22
K
/
V
S
K
I
M
= 0.1A
V
S
= 8 to 16V
0.5
%/V
K
/
I
M
K
I
M
= 25 to 200mA
0.05
%/mA
K
/
T
K
I
M
= 0.1A
T
op
= 30 to +85
C
0.02
%/
C
V
ref
/
V
S
V
ref
Line Regulation
I
M
= 0.1A
V
S
= 8 to 16V
0.04
%/V
V
ref
/
I
M
V
ref
Load Regulation
I
M
= 25 to 200mA
0.01
%/mA
V
ref
/
T
V
ref
Temperature Coefficient
I
M
= 0.1A
T
op
= 30 to +85
C
0.02
%/
C
V
2
Motor "Stop" (Acc. Following
data or grounded)
1
V
I
2
Motor "Stop"
V2 = 1V
0.05
mA
V
2
Motor "Run" (Acc. Following
data or open)
1.5
V
I
2
Motor "Run"
V2 = 1.5V
0.1
mA
TDA7275A
3/7
Figure 1 : Test Circuit.
Figure 2 : Application Circuit.
R
Ttyp.
= K
typ.
R
Mtyp.
if R
T
> K
min
R
Mmin
instability may accur.
A diode across the motor could be necessary with certain kind of motor.
TDA7275A
4/7
Figure 4 : Speed Variation vs.
Supply Voltage.
Figure 3 : Quiescent Current vs.
Supply voltage.
Figure 5 : Speed Variation vs.
Torque (V
S
= 12 V).
TDA7275A
5/7
PDF 
ZIP