TDA7274 ST Microelectronics, TDA7274 Datasheet - Page 7

• Manufacturer Part Number: TDA7274
• Description: LOW-VOLTAGE DC MOTOR SPEED CONTROLLER
• Manufacturer: ST Microelectronics

APPLICATION INFORMATION
Figure 16.
R
V
linearly adjustable varing R
Figure 15 : Speed Variations vs.
M
S
has to be adjusted so that the applied voltage
is suitable for a given motor, the speed is then
E
g
Ambient Temperature.
R
1
T
I
d
R
R
B
S
I
M
R
R
R
K
T
S
T
B
.
1
R
M
K
1
V
ref
The value of R
The values of C
depend on the type of motor used. C
WOW and flutter of the system. C
motor spikes.
If R
T (max.)
R
T (max.)
T
> K R
1
is calculated so that
I
R
E
V
M
M
g
M
(4.7 F typ.) and C
= Motor current at rated speed
= Back electromotive force
= I
= Motor resistance
< K
M
M
.R
, instability may occur.
(min.)
M
+ E
g
.
R
M (min.)
2
2
suppresses
TDA7274
(1 F typ.)
1
adjusts
7/10