TDA7274
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
November 1988
WIDE OPERATING VOLTAGE RANGE
(1.8 to 6 V)
BUILT-IN LOW-VOLTAGE REFERENCE (0.2
V)
LINEARITY IN SPEED ADJUSTMENT
HIGH STABILITY VS. TEMPERATURE
LOW NUMBER OF EXTERNAL PARTS
DESCRIPTION
MINIDIP
ORDERING NUMBER : TDA7274
The TDA7274 is a monolithic integrated circuit
DC motor speed controller intended for use in mi-
crocassettes, radio cassette players and other
consumer equipment. It is particulary suitable for
low-voltage applications.
PIN CONNECTION (top view)
1/10
APPLICATION CIRCUIT
SCHEMATIC DIAGRAM
V
S
= 3.0V
R
M
= 4.9
R
T
= 220
E
g
= 1.65V
I
M
= 100mA
V
M
= R
M
I
M
+ E
g
= 2.14V
TDA7274
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THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
Thermal Resistance Junction-ambient
Max.
100
C/W
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
6
V
I
M
Motor Current
700
mA
P
tot
Power Dissipation at T
amb
= 25
C
1.25
W
ELECTRICAL CHARACTERISTICS (Refer to test circuit, V
S
= 3V, T
amb
= 25
C unless otherwise speci-
fied)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
S
Supply Voltage Range
1.8
6
V
V
ref
Reference Voltage
I
M
= 100mA
0.18
0.20
0.22
V
I
q
Quiescent Current
2.4
6.0
mA
I
d
(Pin 6)
Quiescent Current
120
A
K
Shunt Ratio
I
M
= 100mA
45
50
55
V
sat
Residual Voltage
I
M
= 100mA
0.13
0.3
V
V
ref
V
ref
/
V
S
Line Regulation
I
M
= 100mA
V
S
= 1.8 to 6V
0.20
%/V
K
K
/
V
S
Voltage Characteristic of Shut
Ratio
I
M
= 100mA
V
S
= 1.8 to 6V
0.80
%/V
V
ref
V
ref
/
I
M
Load Regulation
I
M
= 20 to 200mA
0.004
%/mA
K
K
/
I
M
Current Characteristic of Shut
Ratio
I
M
= 20 to 200mA
0.03
%/mA
V
ref
V
ref
/
T
amb
Temperature Characteristic of
Reference Voltage
I
M
= 100mA
Tamb = 20 to +60
C
0.04
%/
C
K
K
/
T
amb
Temperature Characteristic of
Shut Ratio
I
M
= 100mA
Tamb = 20 to +60
C
0.02
%/
C
TDA7274
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Figure 1 : Test Circuit.
Figure 3 : Reference Voltage vs.
Supply Voltage.
Figure 2 : Quiescent Current vs.
Supply Voltage.
TDA7274
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Figure 5 : Reference Voltage vs. Load Current.
Figure 4 : Shunt Ratio vs. Supply Voltage.
Figure 6 : Shunt Ratio vs. Load Current.
Figure 7 : Minimum Supply Voltage (typical) vs.
Load Current.
Figure 9 : Quiescent Current vs.
Ambient Temperature.
Figure 8 : SaturationVoltage vs. Load Current.
TDA7274
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