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UC3620VH датащи(PDF) 3 Page - Texas Instruments

номер детали UC3620VH
подробное описание детали  Switchmode Driver for 3-횈 Brushless DC Motors
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

UC3620VH датащи(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS:
PARAMETER
TEST CONDITIONS
UC3620
UC1620
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
Output Section (cont.)
Output Rise Time
RL = 44
150
150
ns
Output Fall Time
RL = 44
150
150
ns
Under Voltage Lockout
Startup Threshold
8.0
8.0
V
Threshold Hysteresis
0.5
0.5
V
Thermal Shutdown
Junction Temperature
Note 2
150
180
150
180
°C
Total Standby Current
Supply Current
32
55
32
55
mA
Unless otherwise stated, these specifications apply for TA = 0°C to 70°C for 3620; TA
= 55°C to +125°C for UC1620; VCC = 20V, RT = 20V, RT = 10k, CT = -2.2nF. TA=TJ.
UC1620
UC3620
Note 2: These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.
Note 3: The total voltage drop is defined as the sum of both top and bottom side driver.
CIRCUIT DESCRIPTION
The UC3620 is designed for implementation of a com-
plete 3-
∅ brushless DC servo drive using a minimum
number of external components. Below is a functional de-
scription of each major circuit feature.
DECODER
Table 1 shows the decoding scheme used in the UC3620
to decode and drive each of three high current totem pole
output stages. A forward/reverse signal, pin 13, is used to
provide direction. At any point in time, one driver is sour-
cing, one driver is sinking, and the remaining driver is off
or tri-stated. Pulse width modulation is accomplished by
turning the sink driver off during the monostable reset
time, producing a fixed off-time chop mode. Controlled
output rise and fall times help reduce electrical switching
noise while maintaining relatively small switching losses.
Hall lines require pull-up resistors.
CURRENT SENSING
Referring to Figure 1, emitter current is sensed across RS
and fed back through a low pass filter to the current
sense pin 7. This filter is required to eliminate false trig-
gering of the monostable due to leading edge current
spikes. Actual filter values, although somewhat depend-
ent on external loads, will generally be in the 1k
Ω and
1000pF range.
TIMING
An R-C time constant on pin 9 is used by the monostable
to generate a fixed off time at the outputs according to the
formula:
TOFF
= .916RTCT
As the peak current in the emitters approaches the value
at the minus (-) input of the on-board comparator, the
monostable is triggered, causing the outputs to be turned
STEP
FWD/
REV
Ha
Hb
Hc
AOUT
BOUT
COUT
1
1
101
H
L
O
2
1
100
H
O
L
3
1
110
O
H
L
4
1
010
L
H
O
5
1
011
L
O
H
6
1
001
O
L
H
1
0
101
L
H
O
2
0
100
L
O
H
3
0
110
O
L
H
4
0
010
H
L
O
5
0
011
H
O
L
6
0
001
O
H
L
H = HIGH OUTPUT
L = LOW OUTPUT
O = OPEN OUTPUT
TABLE 1
Figure 1. Current Sense Filter
3


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