ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
30 AMP, 500V, 3 PHASE
IGBT BRUSHLESS
MOTOR CONTROLLER
4371
(315) 701-6751
FEATURES:
500 Volt Motor Supply Voltage Capable, Designed for 270V Operation
30 Amp Output Switch Capability
100% Duty Cycle High Side Conduction Capable
Shoot-Through/Cross Conduction Protection
Hall Sensing and Commutation Circuitry on Board
"Real" Four Quadrant Torque Control Capability
Good Accuracy Around the Null Torque Point
Isolated Package Design for High Voltage Isolation Plus Good Thermal Transfer
60°/ 120º Phasing Selectable
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 4371 is a complete 3 Phase IGBT Bridge Brushless Motor Control System in a convenient isolated
hermetic package. The hybrid is capable of 30 amps of output current and 500 volts of DC bus voltage. It has the
normal features for protecting the bridge. Included is all the bridge drive circuitry, hall sensing circuitry, commutation
circuitry and all the current sensing and analog circuitry necessary for closed loop current mode (torque) control.
When PWM'ing, the transistors are modulated in locked anti-phase mode for the tightest control and the most
bandwidth. Provisions for applying different compensation schemes are included. The MSK 4371 has good thermal
conductivity of the IGBT's due to isolated package design that allows direct heat sinking of the hybrid without
insulators.
BLOCK DIAGRAM
TYPICAL APPLICATIONS
3 Phase Brushless DC Motor Control
Servo Control
Fin Actuator Control
Gimbal Control
AZ-EL Control
1
2
3
4
5
6
7
8
9
10
11
12
REFOUT
HALL A
HALL B
HALL C
60 /120
BRAKE
CLOCK SYNC
DIS
GND
N/C
N/C
E/A OUT
1
PIN-OUT INFORMATION
13
14
15
16
17
18
19
20
21
22
23
24
E/A -
GND
+Current Command
-Current Command
+15 VIN
Current Monitor Out
-15 VIN
N/C
N/C
N/C
GND
N/C
25 N/C
26 LGND
27 RTN
28 RTN
29 CVS
30 CVS
31 CØ
32 CØ
33 CV+
34 BVS
35 BVS
36 BØ
37
38
39
40
41
42
43
BØ
BV+
AVS
AVS
AØ
AØ
AV+
PRELIMINARY Rev. A 6/00
ABSOLUTE MAXIMUM RATINGS
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ELECTRICAL SPECIFICATIONS
Parameter
INPUT CURRENT
+15 VIN
-15 VIN
PWM
Clock Free Running Frequency
CLOCK SYNC INPUT
VIL
1
VIH
1
Duty Cycle
1
SYNC Frequency
1
REFERENCE
REFOUT
LOGIC INPUTS
(Hall A,B,C,Brake,60°/120°,DIS)
VIL
1
VIH
1
ANALOG SECTION
Current Command Input Range
1
Current Command Input Current
1
Transconductance
Offset Current
Current Monitor
7
Current Monitor Voltage Swing
ERROR AMP
E/A OUT Swing
1
1
1
1
7
Output PWM'ing
Current Command=0 Volts
Test Conditions
Group A
Subgroup
1
1
4
5,6
-
-
-
-
MSK 4371(H)
3
Min.
-
-
21
18.7
-
12.5
10
Clock +0
5.82
Typ.
110
30
22
22
-
-
-
-
-
Max.
130
40
23
25.3
Min.
-
-
20
-
MSK 4371
2
Typ.
110
30
22
-
-
-
-
-
-
Max.
130
40
24
-
-
2.5
12.5
-
10
90
Clock +0
Clock +3
6.57
5.82
2.5
VOLTS
-
VOLTS
90
%
Clock +3 KHz
6.57
VOLTS
15mA Load
6
6
1,2,3
-
-
-
-
4
5,6
1
2,3
4
5,6
-
-
-
-
-
-
-
-
-
-
3.0
-13.5
-
2.70
2.55
-25
-50
0.300
0.280
-12
-12
6.5
-
175
-
-
-
-
-
-
-
-
-
3
3
0
0
0.33
0.33
-
-
8
6.5
275
-
-
-
35
3
0.8
-
+13.5
1.5
3.30
3.45
25
50
0.367
0.380
+12
+12
-
-
-
6.3
5
2.1
-
-
-
3.0
-13.5
-
2.55
-
-50
-
0.280
-
-12
-12
6.5
-
175
-
-
-
-
-
-
-
-
-
3
-
0
-
0.33
-
-
-
8
6.5
275
-
-
-
35
3
0.8
-
Current Command=0
Volts
5mA Load
5mA Load
+13.5 VOLTS
1.5
mA
3.45
A/V
-
A/V
50
mA
-
mA
0.380
V/A
-
V/A
+12 VOLTS
+12
-
-
-
6.3
5
2.1
-
-
VOLTS
V/µSec
MHz
V/mV
VOLTS
mA
VOLTS
nSec
µSec
Slew Rate
1
Gain Bandwidth Product
Large Signal Voltage Gain
OUTPUT SECTION
30 AMPS
Voltage Drop Across Bridge (1 Upper & 1 Lower)
1
All switches off, V+=270V, 150°C Junction
Leakage Current
1
Diode VSD
1
trr
1
Dead Time
1
NOTES:
1
2
3
4
5
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
Military grade devices ("H" Suffix) shall be 100% tested to Subgroups 1, 2, 3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroup 1, 4 TA = TC = +25°C
2, 5 TA = TC =+125°C
3, 6 TA = TC =
-55°C
6 Maximum power dissipation must be limited according to voltage regulator power dissipation.
7 Measurements do not include offset current at 0V current command.
2
PRELIMINARY Rev. A 6/00
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High Voltage Supply
Current Command Input
Logic Inputs
REFOUT External Load
E/A OUT External Load
Clock SYNC Input
Continuous Output Current
Peak Output Current
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500V
±13.5V
-0.2V to REFOUT
15 mA
5 mA
-0.2V to +15V
30 Amps
41 Amps
Rθ
JC
Thermal Resistance (Output Switches)
TBD
T
ST
Storage Temperature Range
-65°C to+150°C
T
LD
Lead Temperature Range
+300°C
(10 Seconds)
T
C
Case Operating Temperature
-55°C to+125°C
T
J
Junction Temperature
+150°C
Units
mA
mA
KHz
KHz
VOLTS
VOLTS
APPLICATION NOTES
MSK 4371 PIN DESCRIPTIONS
AV+, BV+, CV+ -
are the power connections from the hy-
brid to the bus. The pins for each phase are brought out
separately and must be connected together to the V+ source
externally. The external wiring to these pins should be sized
according to the RMS current required by the motor. These
pins should be bypassed by a high quality monolithic ceramic
capacitor for high frequencies and enough bulk capacitance
for keeping the V+ supply from drooping. 6200 µF of bulk
capacitance was used in the test circuit. The voltage range
on these pins is from 16 volts up to 500 volts.
AØ, BØ & CØ-
are the connections to the motor phase wind-
ings from the bridge output. The wiring to these pins should
be sized according to the required current by the motor. There
are no short circuit provisions for these outputs. Shorts to
V+ or gound from these pins must be avoided or the bridge
will be destroyed.
AVS, BVS, CVS -
are the return pins on the bottom of each
half bridge. They are brought out separately and should be
connected together externally to allow the current from each
half bridge to flow through the sense resistor. The wiring on
these pins should be sized according to the current require-
ments of the motor.
RTN -
is the power return connection from the module to the
bus. All ground returns connect to this point from internal to
the module in a star fashion. All external ground connections
to this point should also be made in a similar fashion. The
V+ capacitors should be returned to this pin as close as
possible. Wire sizing to this pin connection should be made
according to the required current.
LGND -
is an isolated ground connection to the RTN pin of
the hybrid that is connected internally. For any circuitry that
needs to be connected to the RTN pin without the influence
of current flow through RTN should be connected at this
point.
GND -
is a ground pin that connects to the ground plane for
all low powered circuitry inside the hybrid.
+15 VIN -
is the input for applying +15 volts to run the low
power section of the hybrid. This pin should be bypassed
with a 10 µF capacitor and a 0.1 µF capacitor as close to this
pin as possible.
-15 VIN -
is the input for applying -15 volts to run the low
power section of the hybrid. This pin should be bypassed
with a 10 µF capacitor and a 0.1 µF capacitor as close to this
pin as possible.
CURRENT COMMAND (+,-) -
are differential inputs for con-
trolling the module in current mode. Scaled at ±3 amps per
volt of input command, the bipolar input allows both forward
and reverse current control capability regardless of motor com-
mutation direction. The maximum operational command volt-
age should be ±10 volts for ±30 amps of motor current.
CURRENT MONITOR-
is a pin providing a current viewing sig-
nal for external monitoring purposes. This is scaled at ±3
amps of motor current per volt output, up to a maximum of
±10 volts, or ±30 amps. As ±30 amps is exceeded, the
peaks of the waveform may become clipped as the rails of
the amplifiers are reached. This voltage is typically ±12.5
volts, equating to ±37 amps of current peaks.
E/A OUT -
is the current loop error amp output connection.
It is brought out for allowing various loop compensation cir-
cuits to be connected between this and E/A-.
E/A- -is
the current loop error amp inverting input connec-
tion. It is brought out for allowing various loop compensa-
tion circuits to be connected between this and E/A OUT.
CLOCK SYNC-
is an input for synchronizing to an external
clock. The sync circuit will trigger on the edges of the ap-
plied clock and effectively shorten the period of the internal
oscillator on each cycle. The frequency can be increased
from a free running 22 KHz to 25 KHz maximum. The clock
applied shall be 15 volts amplitude with at least a 10% duty
cycle.
REFOUT -
is a 6.25 volt regulated output to be used for pow-
ering the hall devices in various motors. Up to 15 mA of
output current is available.
HALL A, B & C -
are the hall input pins from the hall devices
in the motor. These pins are internally pulled up to 6.25
volts. The halls can reflect a 120/240 degree commutation
scheme or a 60/300 degree scheme.
BRAKE -
is a pin for commanding the output bridge into a
motor BRAKE mode. When pulled low, normal operation com-
mences. When pulled high, the 3 high side bridge switches
turn off and the 3 low side bride switches turn on, causing
rapid deceleration of the motor and will cease motor opera-
tion until pulled high again. Logic levels for this input are TTL
compatible. It is internally pulled high.
IN
DIS -
is a pin for externally disabling the output bridge. A
CMOS logic high will enable the bridge and a CMOS logic low
will disable it.
60/120-
is a pin for selecting the orientation of the commuta-
tion scheme of the motor. A high state will produce 60/300
degree commutation, whereas a low state will produce 120/
240 degree commutation. Logic levels for this input are TTL
compatible. It is internally pulled high.
3
PRELIMINARY Rev. A 6/00
APPLICATION NOTES CONTINUED
COMMUTATION TRUTH TABLE
HALL SENSOR PHASING
120°
60°
I
COMMAND
= POS.
I
COMMAND
= NEG.
BRAKE
HALL HALL HALL HALL HALL HALL
A
B
C
A
B
C
1
1
0
0
0
1
1
0
X
1
0
X
=
=
=
AØ
H
-
L
L
-
H
-
-
L
BØ
-
H
H
-
L
L
-
-
L
CØ
L
L
-
H
H
-
-
-
L
AØ
L
-
H
H
-
L
-
-
L
BØ
-
L
L
-
H
H
-
-
L
CØ
H
H
-
L
L
-
-
-
L
0
0
0
0
0
0
0
0
1
0
1
1
1
0
0
1
0
X
High Level
Low Level
Don't Care
0
0
0
1
1
1
1
0
X
H
L
-
1
1
1
0
0
0
1
0
X
0
1
1
1
0
0
0
1
X
0
0
1
1
1
0
1
0
X
NOTE:
= SOURCE
= SINK
= OPEN
Because of the true 4 quadrant method of output switching,
the output switches will PWM between the I
COMMAND
POSITIVE
and I
COMMAND
NEGATIVE states, with the average percentage
based on I
COMMAND
being a positive voltage and a negative
voltage. With a zero voltage I
COMMAND
, the output switches will
modulate with exactly a 50% duty cycle between the
I
COMMAND
POSITIVE and I
COMMAND
NEGATIVE states.
4
PRELIMINARY Rev. A 6/00
APPLICATION NOTES CONTINUED
BUS VOLTAGE FILTER CAPACITORS
The size and placement of the capacitors for the DC bus has a direct bearing on the amount of noise filtered and also on the
size and duration of the voltage spikes seen by the bridge. What is being created is a series RLC tuned circuit with a resonant
frequency that is seen as a damped ringing every time one of the transistors switches. For the resistance, wire resistance,
power supply impedance and capacitor ESR all add up for the equivalent lumped resistance in the circuit. The inductance can
be figured at about 30 nH per inch from the power supply. Any voltage spikes are on top of the bus voltage and the back EMF
from the motor. All this must be taken into account when designing and laying out the system. If everything has been
minimized, there is another solution. A second capacitance between 5 and 10 times the first capacitor and it should either
have some ESR or a resistor can be added in series with the second capacitor to help damp the voltage spikes.
Be careful of the ripple current in all the capacitors. Excessive ripple current, beyond what the capacitors can handle, will
destroy the capacitors.
GENERAL LAYOUT
Good PC layout techniques are a must. Ground planes for the analog circuitry must be used and should be tied back to the
small pin grounds 9, 14 and 23. Additional ground, pin 26 is an isolated ground that connects internally directly back to the
main DC bus ground pin 27. This can be used as necessary for voltage sensing, etc.
LOW POWER STARTUP
When starting up a system utilizing the MSK 4371 for the first time, there are a few things to keep in mind. First, because of
the small size of the module, short circuiting the output phases either to ground or the DC bus will destroy the bridge. The
current limiting and control only works for current actually flowing through the bridge. The current sense resistor has to see
the current in order for the electronics to control it. If possible, for startup use a lower voltage and lower current power supply
to test out connections and the low current stability. With a limited current supply, even if the controller locks up, the dissipa-
tion will be limited. By observing the E/A OUT pin which is the error amp output, much can be found out about the health and
stability of the system. An even waveform with some rounded triangle wave should be observed. As current goes up, the DC
component of the waveform should move up or down. At full current (with a regular supply) the waveform should not exceed
+8 volts positive peak, or -8 volts negative peak. Some audible noise will be heard which will be the commutation frequency.
If the motor squeals, there is instability and power should be removed immediately unless power dissipation isn't excessive due
to limited supply current. For compensation calculations, refer to the block diagram for all information to determine the
amplifier gain for loop gain calculations.
5
PRELIMINARY Rev. A 6/00
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