U211B-MFPG3 Atmel, U211B-MFPG3 Datasheet - Page 9

• Manufacturer Part Number: U211B-MFPG3
• Description: IC PHASE CONTROL TACHO 16-SOIC
• Manufacturer: Atmel

Specifications of U211B-MFPG3

• 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)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -

7.4
7.5
7.6
4752B–INDCO–09/05
Design Hints
Pulse-output Stage
Automatic Retriggering
Practical trials are normally needed for the exact determination of the values of the relevant
components for load limiting. To make this evaluation easier, the following table shows the
effect of the circuitry on the important parameters for load limiting and summarizes the general
tendencies.
Table 7-1.
P
P
t
t
n.e.
The pulse-output stage is short-circuit protected and can typically deliver currents of 125 mA.
For the design of smaller triggering currents, the function I
10-12 on page
The variable automatic retriggering prevents half cycles without current flow, even if the triac
has been turned off earlier, e.g., due to a collector which is not exactly centered (brush lifter)
or in the event of unsuccessful triggering. If necessary, another triggering pulse is generated
after a time lapse which is determined by the repetition rate set by resistance between pin 5
and pin 3 (R
attempt to trigger comes after a pause of 4.5 t
the half cycle finishes. If pin 5 is not connected, only one trigger pulse per half cycle is gener-
ated. Since the value of R
using R
d
r
Parameters
P
P
P
t
t
max
min
d
r
max
min
max/min
5-3
is only valid for a fixed value of C
5-3
- Maximum continuous power dissipationP
- Power dissipation with no rotation
- Operation delay time
- Recovery time
- No effect
Load Limiting Parameters
). With the maximum repetition rate (pin 5 directly connected to pin 3), the next
18.
Component
R
Increases
Increases
Increases
n.e.
n.e.
10
5-3
Increasing
determines the charging current of C
2
.
p
and this is repeated until either the triac fires or
Component
R
Decreases
Decreases
n.e.
Increases
Increases
9
Increasing
P
1
1
GT
= f
= f
= f(R
(n)
(n)
n = 0
n
GT
0
) can be taken from
2
, any repetition rate set
Increases
Increases
Component
C
n.e.
n.e.
n.e.
9
Increasing
U211B
Figure
9