U211B ATMEL Corporation, U211B Datasheet - Page 16

• Manufacturer Part Number: U211B
• Description: as U209B + Foldback
• Manufacturer: ATMEL Corporation

The maximum load regulation shows the principle in the
same speed dependency as the original version (see
figure 2). When reaching the maximum load, the control
unit is turned to a
flows. This function is effected by the thyristor, formed
by T
reaches ca. 6.8 V (reference point Pin 16). The potential
U211B
16 (21)
1
and T
2
which ignites as soon as the voltage at Pin 15
max
, adjustable with R
Figure 26. Speed control, automatic retriggering, load switch-off, soft start
2
. Then only I
O
at Pin 15 is lifted and kept by R
operating threshold whereby the maximum load
regulation starts and adjusts the control unit constantly to
a
shows that the circuit is still in operation in the matter of
a quiet buzzing sound.
max
(I
O
), inspite of a reduced load current. The motor
14
Rev. A4, 03-Aug-01
over the internally