U211B-XFPG3Y ATMEL Corporation, U211B-XFPG3Y Datasheet - Page 7

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

7.1
7.2
7.3
4752B–INDCO–09/05
Pulse Blocking
Control Amplifier
Load Limitation
The output of pulses can be blocked by using pin 18 (standby operation) and the system reset
via the voltage monitor if V
output is released when V
Monitoring of the rotation can be carried out by connecting an RC network to pin 18. In the event
of a short or open circuit, the triac triggering pulses are cut off by the time delay which is deter-
mined by R and C. The capacitor C is discharged via an internal resistance R
charge transfer process of the f/V converter. If there are no more charge transfer processes, C is
charged up via R until the switch-off threshold is exceeded and the triac triggering pulses are cut
off. For operation without trigger pulse blocking or monitoring of the rotation, pin 18 and pin 16
must be connected together.
Figure 7-1.
The integrated control amplifier (see
the set value (pin 11) with the instantaneous value on pin 10, and generates a regulating voltage
on the output pin 12 (together with the external circuitry on pin 12). This pin always tries to keep
the actual voltage at the value of the set voltages. The amplifier has a transmittance of typically
1000 µA/V and a bipolar current source output on pin 12 which operates with typically ±110 µA.
The amplification and frequency response are determined by R
out). For open-loop operation, C
connected with pin 12 and pin 8 with pin 2. The phase angle of the triggering pulse can be
adjusted by using the voltage on pin 11. An internal limitation circuit prevents the voltage on
pin 12 from becoming more negative than V
The load limitation, with standard circuitry, provides full protection against overloading of the
motor. The function of load limiting takes account of the fact that motors operating at higher
speeds can safely withstand larger power dissipations than at lower speeds due to the increased
action of the cooling fan. Similarly, considerations have been made for short-term overloads for
the motor which are, in practice, often required. These behaviors are not damaging and can be
tolerated.
Operation Delay
R = 1 M
18
18
-1.5 V, followed by a soft start such as after turn-on.
-1.25 V. After cycling through the switching point hysteresis, the
4
, C
5
Figure 10-17 on page
, R
6
18
, R
1
16
7
, C
C = 1 µF
+ 1 V.
17
7
2
, C
10 V
8
and R
16
3
11
21) with differential input compares
can be omitted. Pin 10 should be
15
4
7
, C
7
, C
8
and R
i
= 2 k with each
11
U211B
(can be left
7