U211B-MFPG3Y Atmel, U211B-MFPG3Y Datasheet - Page 4

• Manufacturer Part Number: U211B-MFPG3Y
• Description: IC PHASE CONTROL TACHO 16SOIC
• Manufacturer: Atmel

Specifications of U211B-MFPG3Y

• Applications: AC Motor Controller
• Number Of Outputs: 1
• Current - Output: 7.5mA
• Voltage - Supply: 14.6 V ~ 16.6 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Compliant

3. Mains Supply
4. Phase Control
4
U211B
The U211B is equipped with voltage limiting and can therefore be supplied directly from the
mains. The supply voltage between pin 2 (+ pol/_|_) and pin 3 builds up across D
is smoothed by C
Further information regarding the design of the mains supply can be found in the section
“Design Hints” on page
from the supply voltage and is used for regulation.
Operation using an externally stabilized DC voltage is not recommended.
If the supply cannot be taken directly from the mains because the power dissipation in R
would be too large, the circuit as shown in
Figure 3-1.
The phase angle of the trigger pulse is derived by comparing the ramp voltage (which is mains
synchronized by the voltage detector) with the set value on the control input pin 12. The slope
of the ramp is determined by C
using R
When the potential on pin 7 reaches the nominal value predetermined at pin 12, a trigger
pulse is generated whose width t
the pulse width can be evaluated by assuming 8 µs/nF). At the same time, a latch is set, so
that as long as the automatic retriggering has not been activated, no more pulses can be gen-
erated in that half cycle.
The current sensor on pin 1 ensures that, for operations with inductive loads, no pulse will be
generated in a new half cycle as long as a current from the previous half cycle is still flowing in
the opposite direction to the supply voltage at that instant. This makes sure that “gaps” in the
load current are prevented.
The control signal on pin 12 can be in the range of 0V to –7V (reference point pin 2).
If V
The phase angle is minimum (
R
1
12
=
= –7V, the phase angle is at maximum (
V
-------------------- -
2
M
2 I
on pin 6. The maximum phase angle
–
S
V
S
Supply Voltage for High Current Requirements
1
. The value of the series resistance can be approximated using:
9. The reference voltage source on pin 16 of typically –8.9V is derived
24V
~
2
~
min
and its charging current. The charging current can be varied
p
)
is determined by the value of C
when V
R1
Figure 3-1
12
1
= V
max
max
+
2
2
.
),
can also be adjusted by using R
C1
i.e., the current flow angle, is at minimum.
should be used.
3
4
5
2
(the value of C
4752B–INDCO–09/05
1
2
and R
2
and hence
.
1
and
1