TDA7274
LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
1 FEATURES
■
■
■
■
■
WIDE OPERATING VOLTAGE RANGE (1.8 to
6 V)
BUILT-IN LOW-VOLTAGE REFERENCE
(0.2V)
LINEARITY IN SPEED ADJUSTMENT
HIGH STABILITY VS. TEMPERATURE
LOW NUMBER OF EXTERNAL PARTS
2 DESCRIPTION
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 lowvoltage applications.
Figure 2. Application Circuit
Figure 1. Package
Table 1. Order Codes
Part Number
TDA7274D
SO8
Package
SO8
September 2004
Rev. 4
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TDA7274
Figure 3.
Table 2. Absolute Maximum Ratings
Symbol
V
S
I
M
P tot
Parameter
Supply Voltage
Motor Current
Power Dissipation at Tamb = 25°C
Table 3. Thermal Data
Symbol
R th j-amb
Parameter
Thermal Resistance Junction-ambient
Figure 4. Schematic Diagram
Value
6
700
1.25
Value
100
Unit
V mA
W
Unit
°C/W
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TDA7274
Table 4. Electrical Characteristcs (Refer to test circuit, V
S
= 3V, T amb
= 25°C unless otherwise specified)
Test Condition Typ.
Symbol
V
S
V ref
I q
I d
(Pin 6 )
K
V sat
∆
V
--------------
V r ef r ef
/
∆
V
S
Parameter
Supply Voltage Range
Reference Voltage
Quiescent Current
Quiescent Current
Shunt Ratio
Residual Voltage
Line Regulation
I
M
= 100mA
I
M
= 100mA
I
M
= 100mA
I
M
= 100mA; V
S
= 1.8 to 6V
Min.
1.8
0.18
45
0.20
2.4
120
50
0.13
0.20
Max.
6
0.22
6.0
55
0.3
Unit
V
V mA
µ
A
–
V
%/V
Voltage Characteristic of Shut
Ratio
I
M
= 100m ; V
S
= 1.8 to 6V 0.80
%/V ∆ k
K
/
∆
V
S
∆
V
V r ef
-------------r ef
/
∆
I
M
∆ k
K
-------/
∆
I
M
∆
V
--------------
V r ef r ef
/
∆
T am b
∆
K
K
/
∆
T am b
Load Regulation
Current Characteristic of Shut
Ratio
Temperature Characteristic of
Reference Voltage
Temperature Characteristic of
Shut Ratio
I
M
= 20 to 200mA
I
M
= 20 to 200mA
I
M
= 100mA
I
M
= 100mA;
Tamb = 20 to 60°C
0.004
– 0.03
0.04
0.02
%/mA
%/mA
%/ C
%/ C
Figure 5. Test Circuit
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TDA7274
Figure 6. Quiescent Current vs. Supply
Voltage.
Figure 9. Reference Voltage vs. Load Current.
Figure 7. Reference Voltage vs. Supply
Voltage.
Figure 10. Shunt Ratio vs. Load Current.
Figure 8. Shunt Ratio vs. Supply Voltage.
Figure 11. Minimum Supply Voltage (typical) vs. Load Current.
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Figure 12. Saturation Voltage vs. Load Current.
Figure 15. Application Circuit
TDA7274
Figure 13. Quiescent Current vs. Ambient
Temperature.
Figure 16. P. C. Board and Components layout of the Circuit of fig. 15.
Figure 14. Reference Voltage vs. Ambient
Temperature.
Figure 17. Speed Variations vs. Supply
Voltage.
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TDA7274
Figure 18. Speed Variations vs. Motor Current.
Figure 19. Speed Variations vs. Ambient
Temperature.
3 APPLICATION INFORMATION
Figure 20.
E g
= R
T
I d
+ I
M
R
-------
K
T
– R
M
+ V re f
1 +
R
R
S
-------
S
+
R
T
------1
R
S
+
1
----
K
R
S
has to be adjusted so that the applied voltage V
M
is suitable for a given motor, the speed is then linearly adjustable varing R
B
.
Obsolete Product(s) - Obsolete Product(s)
M
, instability may occur.
The value of R
T
is calculated so that R
T (max.)
< K
(min.)
·. R
M (min.)
If R
T (max.)
> K · R
The values of C
1
(4.7
µ
F typ.) and C
2
(1 m
F typ.) depend on the type of motor used. C
1
adjusts WOW and flutter of the system. C
2
suppresses motor spikes.
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Figure 21. 3V Stereo Cassette Miniplayer with Motor Speed Control.
TDA7274
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TDA7274
Figure 22. SO8 Mechanical Data & Package Dimensions
DIM.
A
A1
A2
B mm inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
1.35
0.10
1.10
0.33
1.75
0.25
1.65
0.51
0.053
0.004
0.043
0.013
0.069
0.010
0.065
0.020
C
D
(1)
E
0.19
4.80
3.80
0.25
5.00
0.007
0.189
4.00
0.15
0.010
0.197
0.157
e
H
1.27
0.050
5.80
0.25
6.20
0.228
0.50
0.010
0.244
0.020
h
L 0.40
1.27
0.016
0˚ (min.), 8˚ (max.)
0.050
k ddd 0.10
0.004
Note: (1) Dimensions D does not include mold flash, protrusions or gate burrs.
Mold flash, potrusions or gate burrs shall not exceed
0.15mm (.006inch) in total (both side).
OUTLINE AND
MECHANICAL DATA
SO-8
0016023 C
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Table 5. Revision History
Date
September 2003
September 2004
Revision
3
4
First Issue EDOCS
Stylesheet update
Description of Changes
TDA7274
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TDA7274
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