U211B-XFPG3Y ATMEL Corporation, U211B-XFPG3Y Datasheet - Page 10

• Manufacturer Part Number: U211B-XFPG3Y
• Description: Phase Control IC with Overload Limitation for Tacho Applications
• Manufacturer: ATMEL Corporation

7.7
10
General Hints and Explanation of Terms
U211B
To ensure safe and trouble-free operation, the following points should be taken into consider-
ation when circuits are being constructed or in the design of printed circuit boards.
To achieve a high noise immunity, a maximum ramp voltage of 6 V should be used. The typical
resistance R can be calculated from I as follows:
R k
T =
C =
A 10% lower value of R (under worst case conditions) is recommended.
Figure 7-2.
• The connecting lines from C
• The common (earth) connections of the set-point generator, the tacho generator and the final
• The tacho generator should be mounted without influence by strong stray fields from the
• The connections from R
connection to pin 2 should not carry any additional high current such as the load current.
When selecting C
interference suppression capacitor C
motor.
=
T ms
-------------------------------------------------------------
Period duration for mains frequency (10 ms at 50 Hz)
Ramp capacitor, maximum ramp voltage 6 V and constant voltage drop at
R = 1.13 V
Explanation of Terms in Phase Relationship
C nF
Trigger
Load
Load
Current
Voltage
Supply
Pulse
Mains
1.13 V
2
, a low temperature coefficient is desirable.
V
GT
V
I L
V
6 V
L
10
and C
10
2
to pin 7 and pin 2 should be as short as possible. The
3
5
t
p
should be as short as possible.
/2
4
of the f/V converter should not carry load current.
t
pp
= 4.5 t
p
3/2
2
4752B–INDCO–09/05