TDA7274
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
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
MINIDIP
DESCRIPTION
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.
ORDERING NUMBER :
TDA7274
PIN CONNECTION
(top view)
November 1988
1/10
TDA7274
APPLICATION CIRCUIT
V
S
= 3.0V
R
M
= 4.9Ω
R
T
= 220Ω
E
g
= 1.65V
I
M
= 100mA
V
M
= R
M
I
M
+ E
g
= 2.14V
SCHEMATIC DIAGRAM
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TDA7274
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
I
M
P
tot
Supply Voltage
Motor Current
Power Dissipation at T
amb
= 25°C
Parameter
Value
6
700
1.25
Unit
V
mA
W
THERMAL DATA
Symbol
R
th j-amb
Parameter
Thermal Resistance Junction-ambient
Max.
Value
100
Unit
°C/W
ELECTRICAL CHARACTERISTICS
(Refer to test circuit, V
S
= 3V, T
amb
= 25°C unless otherwise speci-
fied)
Symbol
V
S
V
ref
I
q
I
d
(Pin 6)
K
Parameter
Supply Voltage Range
Reference Voltage
Quiescent Current
Quiescent Current
Shunt Ratio
Residual Voltage
Line Regulation
Voltage Characteristic of Shut
Ratio
Load Regulation
Current Characteristic of Shut
Ratio
I
M
= 100mA
I
M
= 100mA
I
M
= 100mA
V
S
= 1.8 to 6V
I
M
= 100mA
V
S
= 1.8 to 6V
I
M
= 20 to 200mA
I
M
= 20 to 200mA
I
M
= 100mA
Tamb = –20 to +60°C
I
M
= 100mA
Tamb = 20 to +60°C
45
I
M
= 100mA
Test Condition
Min.
1.8
0.18
0.20
2.4
120
50
0.13
0.20
0.80
0.004
–0.03
0.04
0.02
55
0.3
Typ.
Max.
6
0.22
6.0
Unit
V
V
mA
µA
–
V
%/V
%/V
%/mA
%/mA
%/°C
%/°C
∆
V
ref
V
ref
V
sat
⁄ ∆V
S
∆
K
⁄ ∆V
S
K
∆
V
ref
V
ref
⁄ ∆I
M
∆
K
⁄ ∆I
M
K
∆
V
ref
V
ref
∆
K
⁄ ∆T
amb
Temperature Characteristic of
K
Shut Ratio
⁄ ∆T
amb
Temperature Characteristic of
Reference Voltage
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TDA7274
Figure 1 :
Test Circuit.
Figure 2
: Quiescent Current vs.
Supply Voltage.
Figure 3
: Reference Voltage vs.
Supply Voltage.
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TDA7274
Figure 4
: Shunt Ratio vs. Supply Voltage.
Figure 5
: Reference Voltage vs. Load Current.
Figure 6
: Shunt Ratio vs. Load Current.
Figure 7
: Minimum Supply Voltage (typical) vs.
Load Current.
Figure 8
: SaturationVoltage vs. Load Current.
Figure 9
: Quiescent Current vs.
Ambient Temperature.
5/10
模拟与混合信号
