TI UC3620V

UC1620
UC3620
Switchmode Driver for 3-∅ Brushless DC Motors
FEATURES
DESCRIPTION
•
2A Continuous, 3A Peak Output
Current
•
8V to 40V Operation
•
Internal High Gain Amplifier for
Velocity Control Applications
•
TTL Compatible Hall Inputs
•
Mask Programmable Decode Logic
The UC3620 is a brushless DC motor driver capable of decoding and
driving all 3 windings of a 3-phase brushless DC motor. In addition, an
on-board current comparator, oscillator, and high gain Op-Amp provide
all necessary circuitry for implementing a high performance, chopped
mode servo amplifier. Full protection, including thermal shutdown,
pulse-by-pulse current limiting, and under-voltage lockout aid in the
simple implementation of reliable designs. Both conducted and radiated
EMI have been greatly reduced by limiting the output dv/dt to 150V/µs
for any load condition.
•
Pulse-by-Pulse Current Limiting
•
Internal Thermal Shutdown Protection
•
Under-Voltage Lockout
•
Available in SP Hermetic Package
The UC1620SP is characterized for operation over the full military temperature range of -55°C to +125°C, while the UC3620SP is characterized for 0°C to +70°C.
BLOCK DIAGRAM
3/97
1
UC1620
UC3620
ABSOLUTE MAXIMUM RATINGS (Note 1)
CONNECTION DIAGRAMS
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Output Current, Source or Sink
Non-Repetitive (t = 100µsec), lo . . . . . . . . . . . . . . . . . . . . 3A
Repetitive (80% on - 20% off; tON = 10ms) . . . . . . . . . . 2.5A
DC Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2A
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +Vcc
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +Vcc
Total Power Dissipation (at TCASE = 75° C)
for SP Package (Note 2). . . . . . . . . . . . . . . . . . . . . . . . . . 15W
Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C
SP Hermetic Power DIL
Note 1: All voltages are with respect to ground. Currents are
positive into, negative out of the specified terminal.
Note 2: Consult Packaging Section of Databook for thermal
limitations and considerations of package.
ELECTRICAL CHARACTERISTICS: 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.
PARAMETER
TEST CONDITIONS
UC3620
MIN
UC1620
TYP
MAX
Input Offset Voltage
1.5
Input Bias Current
Input Offset Current
MIN
UNIT
TYP
MAX
10
1.5
10
-.25
-2.0
-.25
-2.0
µA
15
250
15
250
nA
Error Amplifier Section
Common Mode Range
Vcc = 8V to 40V
0
Open Loop Gain
∆VCOMP = 1V to 4V
80
V IN-2
100
0
75
VIN-2
mV
V
100
dB
Unity Gain Bandwidth
TJ = 25°C, Note 2
0.8
0.8
MHz
Output Sink Current
VCOMP = 1V
2
2
mA
Output Source Current
VCOMP = 4V
8
8
mA
Current Sense Section
Input Bias Current
-2.0
-5
-2.0
-5
µA
Internal Clamp
.425
0.5
.575
.405
0.5
.595
V
Divider Gain
.180
0.2
.220
.170
0.2
.230
V/V
.8
1.0
1.2
.75
1.0
1.25
V
20
22
17
20
23
µs
Internal Offset Voltage
Timing Section
Output Off Time
18
Upper Mono Threshold
5.0
5.0
V
Lower Mono Threshold
2.0
2.0
V
Decoder Section
High-Level Input Voltage
2.2
2.5
V
Low-Level Input Voltage
0.8
0.8
V
High-Level Input Current
10
10
µA
Low-Level Input Current
-10
µA
-10
Output Section
Output Leakage Current
VCC = 40V
1500
µA
VF1 Schottky Diode
IO = 2A
1.5
2.0
1.5
2.0
V
VF1 Substrate Diode
IO = 2A
2.2
3.0
2.2
3.0
V
Total Output Voltage Drop
IO = 2A, Note 3
3.0
3.6
3.0
3.6
V
500
2
UC1620
UC3620
ELECTRICAL CHARACTERISTICS: 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.
PARAMETER
TEST CONDITIONS
UC3620
MIN
TYP
UC1620
MAX
MIN
TYP
UNIT
MAX
Output Section (cont.)
Output Rise Time
RL = 44Ω
150
150
ns
Output Fall Time
RL = 44Ω
150
150
ns
Under Voltage Lockout
Startup Threshold
8.0
Threshold Hysteresis
8.0
0.5
0.5
V
V
Thermal Shutdown
Junction Temperature
Note 2
150
180
150
180
°C
55
mA
Total Standby Current
Supply Current
32
55
32
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.
Hall lines require pull-up resistors.
TABLE 1
STEP
1
2
3
4
5
6
1
2
3
4
5
6
FWD/
REV
1
1
1
1
1
1
0
0
0
0
0
0
Ha
Hb
Hc
AOUT
BOUT
COUT
1
1
1
0
0
0
1
1
1
0
0
0
0
0
1
1
1
0
0
0
1
1
1
0
1
0
0
0
1
1
1
0
0
0
1
1
H
H
O
L
L
O
L
L
O
H
H
O
L
O
H
H
O
L
H
O
L
L
O
H
O
L
L
O
H
H
O
H
H
O
L
L
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 triggering of the monostable due to leading edge current
spikes. Actual filter values, although somewhat dependent on external loads, will generally be in the 1kΩ 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
H = HIGH OUTPUT
L = LOW OUTPUT
O = OPEN OUTPUT
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
CIRCUIT DESCRIPTION
The UC3620 is designed for implementation of a complete 3-∅ brushless DC servo drive using a minimum
number of external components. Below is a functional description 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 sourcing, 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.
Figure 1. Current Sense Filter
3
UC1620
UC3620
CIRCUIT DESCRIPTION (cont.)
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 generates 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 according to the formula:
off. On time is determined by the amount of time required
for motor current to increase to the value required to retrip the monostable. A timing sequence of these events is
shown in Figure 2.
RS =
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 accomplished by appropriately configuring the gain and
feedback of this amplifier. To provide a larger dynamic signal 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 effect on closed loop performance.
Figure 2. Chopped Mode Timing Diagram
CURRENT LIMIT
Since peak current is being controlled at all times by the
internal comparator, a simple voltage clamp at its negative (-) 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 generates 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 according to the formula:
RS =
0.5
PROTECTION FUNCTIONS
Protective functions including under-voltage lockout, peak
current limiting, and thermal shutdown, provide an extremely rugged device capable of surviving under many
types of fault conditions. Under-voltage lockout guarantees the outputs will be off or tri-slated until VCC is sufficient 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.
0.5
ICURRENTLIMIT
Since peak current is being controlled at all times by the
internal comparator, a simple voltage clamp at its nega-
4
UC1620
UC3620
TYPICAL APPLICATIONS
*Both VCC PWR and VCC LOGIC pins must be connected together when using the SP package.
3-∅ Brushless DC Open Loop Motor Drive
*Both VCC PWR and VCC LOGIC pins must be connected together when using the SP package.
3-∅ Brushless DC Open Loop Motor with Current Limit at 2A.
5
UC1620
UC3620
*Both VCC PWR and VCC LOGIC pins must be connected together when using the SP package.
Closed Loop Speed Control Servo
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
6
PACKAGE OPTION ADDENDUM
www.ti.com
30-Mar-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
Lead/Ball Finish
MSL Peak Temp (3)
UC1620SP
OBSOLETE
UTR
24
TBD
Call TI
Call TI
UC1620SP883B
OBSOLETE
UTR
24
TBD
Call TI
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UC1620SP883C
OBSOLETE
UTR
TBD
Call TI
Call TI
UC3620SP
OBSOLETE
UTR
24
TBD
Call TI
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UC3620V
OBSOLETE
UTR
15
TBD
Call TI
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UC3620VH
OBSOLETE
UTR
15
TBD
Call TI
Call TI
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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