SGS Thomson Microelectronics TDA7274 Datasheet
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
WIDEOPERATINGVOLTAGERANGE
(1.8 to 6 V)
BUILT-IN LOW-VOLTAGE REFERENCE (0.2
V)
LINEARITYIN SPEED ADJUSTMENT
HIGHSTABILITY VS. TEMPERATURE
LOW NUMBER OF EXTERNALPARTS
DESCRIPTION
TDA7274
MINIDIP
The TDA7274 is a monolithic integrated circuit
DC motor speed controller intended for use in microcassettes, radio cassette players and other
consumer equipment. It is particulary suitable for
low-voltage applications.
PIN CONNECTION (top view)
ORDERING NUMBER : TDA7274
November 1988
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TDA7274
APPLICATION CIRCUIT
VS= 3.0V
= 4.9Ω
R
M
= 220Ω
R
T
= 1.65V
E
g
= 100mA
I
M
V
M=RMIM+Eg
= 2.14V
SCHEMATIC DIAGRAM
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TDA7274
ABSOLUTE MAXIMUMRATINGS
Symbol Parameter Value Unit
V
Supply Voltage
S
Motor Current 700 mA
I
M
P
Power Dissipation at T
tot
=25°C 1.25 W
amb
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal Resistance Junction-ambient Max. 100 °C/W
6V
ELECTRICAL CHARACTERISTICS (Refer to test circuit, VS= 3V, T
=25°C unless otherwisespeci-
amb
fied)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
V
I
(Pin 6) Quiescent Current 120 µA
I
d
K
V
sat
∆V
ref
V
ref
∆K
⁄∆VSVoltage Characteristic of Shut
K
∆V
ref
V
ref
∆K
⁄∆IMCurrent Characteristic of Shut
K
∆V
ref
⁄∆T
V
ref
∆K
⁄∆T
K
Supply Voltage Range
S
Reference Voltage IM= 100mA 0.18 0.20 0.22 V
ref
Quiescent Current 2.4 6.0 mA
q
Shunt Ratio I
= 100mA
M
Residual Voltage IM= 100mA 0.13 0.3 V
⁄∆V
Line Regulation IM= 100mA
S
= 1.8 to 6V
V
S
IM= 100mA
Ratio
= 1.8 to 6V
V
S
⁄∆IMLoad Regulation IM= 20 to 200mA 0.004 %/mA
IM= 20 to 200mA –0.03 %/mA
Ratio
Temperature Characteristic of
amb
Reference Voltage
Temperature Characteristic of
amb
Shut Ratio
IM= 100mA
Tamb = –20 to +60°C
IM= 100mA
Tamb = 20 to +60°C
1.8 6 V
45 50 55 –
0.20 %/V
0.80 %/V
0.04 %/°C
0.02 %/°C
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