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UC1620 Scheda tecnica(PDF) 4 Page - Texas Instruments

Il numero della parte UC1620
Spiegazioni elettronici  Switchmode Driver for 3-횈 Brushless DC Motors
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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UC1620
UC3620
off. On time is determined by the amount of time required
for motor current to increase to the value required to re-
trip the monostable. A timing sequence of these events is
shown in Figure 2.
CURRENT LIMIT
Since peak current is being controlled at all times by the
internal comparator, a simple voltage clamp at its nega-
tive (-) input will limit peak current to a maximum value. A
fixed 0.5V internal clamp has been included on the
UC3620, and any current spike in the output which gener-
ates a sensed voltage greater than 0.5V will immediately
shut down the outputs. Actual peak current values may be
programmed by selecting the appropriate value of RS ac-
cording to the formula:
RS
=
0.5
ICURRENTLIMIT
Since peak current is being controlled at all times by the
internal comparator, a simple voltage clamp at its nega-
tive (-) input will limit peak current to a maximum value. A
fixed 0.5V internal clamp has been included on the
UC3620, and any current spike in the output which gen-
erates a sensed voltage greater than 0.5V will immedi-
ately shut down the outputs. Actual peak current values
may be programmed by selecting the appropriate value of
RS according to the formula:
RS
=
0.5
ICURRENTLIMIT
ERROR AMPLIFIER LIMIT
A high performance, on-board error amplifier is included
to facilitate implementing closed loop motor control. Error
voltage generation and loop compensation are easily ac-
complished by appropriately configuring the gain and
feedback of this amplifier. To provide a larger dynamic sig-
nal range at the output of the error amplifier, a divide by 5
resistor network is used to reduce the error signal level
before applying to the internal comparator. In addition, a
one volt offset has been introduced at the output of the
error amplifier to guarantee control down to zero current
in the output stages. Since this offset is divided by the
open loop gain of the feedback loop, it has virtually no ef-
fect on closed loop performance.
PROTECTION FUNCTIONS
Protective functions including under-voltage lockout, peak
current limiting, and thermal shutdown, provide an ex-
tremely rugged device capable of surviving under many
types of fault conditions. Under-voltage lockout guaran-
tees the outputs will be off or tri-slated until VCC is suffi-
cient for proper operation of the chip. Current limiting
limits the peak current for a stalled or shorted motor,
whereas thermal shutdown will tri-state the outputs if a
temperature above 150°C is reached.
Figure 2. Chopped Mode Timing Diagram
CIRCUIT DESCRIPTION (cont.)
4


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