MSK4471 datasheet, PDF - EEWORLD Datasheet

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MSK4471: DescriptionBrushless DC Motor Controller, 41A,; CategoryOther integrated circuit (IC) The signal circuit; File Size316KB，7 Pages; ManufacturerM.S. Kennedy Corporation ( Anaren ); Websitehttps://www.anaren.com/capabilities/multi-chip-modules

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MSK4471 Overview

Brushless DC Motor Controller, 41A,

MSK4471 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	M.S. Kennedy Corporation ( Anaren )
package instruction	,
Reach Compliance Code	unknown
ECCN code	EAR99
Analog Integrated Circuits - Other Types	BRUSHLESS DC MOTOR CONTROLLER
JESD-30 code	R-XXMA-X31
Number of functions	1
Number of terminals	31
Maximum output current	41 A
Package body material	UNSPECIFIED
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Nominal supply voltage (Vsup)	15 V
surface mount	NO
Terminal form	UNSPECIFIED
Terminal location	UNSPECIFIED
Maximum time at peak reflow temperature	NOT SPECIFIED

MSK4471 Preview

ISO 9001 CERTIFIED BY DSCC

M.S.KENNEDY CORP.

FEATURES:

30 AMP, 500V, 3 PHASE

IGBT BRUSHLESS

MOTOR CONTROLLER

4471

(315) 699-9201

8170 Thompson Road Cicero, N.Y. 13039

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 Base Plate Design for High Voltage Isolation Plus Good Thermal Transfer

60°/ 120º Phasing Selectable

Tach Output for Velocity Feedback, Open Collector Hall Outputs for Direction Sensing

DESCRIPTION:

The MSK 4471 is a complete 3 Phase IGBT Bridge Brushless Motor Control System in a convenient isolated

baseplate package. The module 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 4471

has good thermal conductivity of the IGBT's due to isolated plate design that allows direct heat sinking of the

module without insulators.

BLOCK DIAGRAM

TYPICAL APPLICATIONS

3 Phase Brushless DC Motor Control

Servo Control

Fin Actuator Control

Gimbal Control

AZ-EL Control

Disable

Clock SYNC

-15 VIN

E/A OUT

-15 VIN

E/A -

GND

Tach Out

GND

Tach RC

PIN-OUT INFORMATION

-Current Command

REF Out

+Current Command

Hall C

Current Monitor Out

Hall B

Brake

Hall A

+15 VIN

Hall C

+15 VIN

Hall B

GND

Hall A

GND

60/120

GND

CØ

BØ

AØ

V+

PRELIMINARY Rev. - 5/99

ABSOLUTE MAXIMUM RATINGS

○

ELECTRICAL SPECIFICATIONS

Parameter

INPUT CURRENT

+15 VIN

-15 VIN

PWM

Clock Free Running Frequency

CLOCK SYNC INPUT

VIL

VIH

Duty Cycle

SYNC Frequency

REFERENCE

REFOUT

LOGIC INPUTS

(Hall A,B,C,Brake,60°/120°,DIS)

VIL

VIH

ANALOG SECTION

Current Command Input Range

Current Command Input Current

Transconductance

Offset Current

Current Monitor

Current Monitor Voltage Swing

ERROR AMP

E/A OUTPUT Voltage Swing

Slew Rate

Gain Bandwidth Product

Large Signal Voltage Gain

OUTPUT SECTION

30 AMPS

Voltage Drop Across Bridge (1 Upper & 1 Lower)

All switches off, V+=270V, 150°C Junction

Leakage Current

Diode VSD

trr

Dead Time

Current Command=0 Volts

5mA Load

15mA Load

Output PWM'ing

Current Command=0 Volts

Test Conditions

MSK 4471

Min.

12.5

Clock+0

5.82

Typ.

110

Max.

130

2.5

Clock+3

6.57

3.0

-13.5

2.55

-50

0.280

-12

6.5

175

0.33

6.5

275

0.8

+13.5

1.5

3.45

0.380

+12

6.3

2.6

NOTES:

1 Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.

2 Measurements do not include offset current at 0V current command.

PRELIMINARY Rev.- 5/99

○

High Voltage Supply

500V

Current Command Input

±13.5V

Logic Inputs

-0.2V to REFOUT

REFOUT External Load

15 mA

E/A OUT External Load

5 mA

Clock SYNC Input

-0.2V to +15V

Continuous Output Current

30 Amps

Peak Output Current

41 Amps

○

TBD

Rθ

Thermal Resistance (Output Switches)

-25°C to +150°C

Storage Temperature Range

+300°C

Lead Temperature Range

(10 Seconds)

-25°C to +125°C

Case Operating Temperature

+150°C

Junction Temperature

Units

KHz

VOLTS

KHz

VOLTS

A/V

V/A

VOLTS

V/µSec

MHz

V/mV

VOLTS

nSec

µSec

APPLICATION NOTES

MSK 4471 PIN DESCRIPTIONS

AV+, BV+, CV+ -

are the power connections from the

hybrid 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 mono-

lithic ceramic capacitor for high frequencies and enough

bulk capacitance for keeping the V+ supply from drooping.

2200µF 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 re-

quirements 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 by-

passed 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 commutation direction. The maximum operational

command voltage should be ±10 volts for ±30 amps of

motor current.

60/120 -

is a pin for selecting the orientation of the commu-

tation 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.

CURRENT MONITOR-

is a pin providing a current viewing

signal for external monitoring purposes. This is scaled at

±3 amps of motor current per volt output, up to a maxi-

mum of ±10 volts, or ±30 amps. As ±30 amps is ex-

ceeded, the peaks of the waveform may become clipped as

the rails of the amplifiers are reached. This voltage is typi-

cally ±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

circuits 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

applied clock and effectively shorten the period of the in-

ternal oscillator on each cycle. The frequency can be in-

creased 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

powering 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 de-

vices in the motor. These pins are internally pulled up to

6.25 volts. The halls can reflect a 120/240 degree commu-

tation scheme or a 60/300 degree scheme.

TACH R-C -

is a pin for programming a resistor/capacitor

R/C for a monostable one-shot triggered by each transition

of the hall inputs. By varying the R and C, various pulse

widths can be obtained at the TACH OUT pin. The pulse

width is approximately 1.2RC. Practical limitations on the

pulse width are 10µS to 50mS. The resistor and capacitor

are connected as follows: resistor between TACH R-C and

REFOUT, capacitor between TACH R-C and GND.

TACH OUT -

is the pulse output pin for use as a velocity

feedback signal. The pulse rate is based on the transitions

of each hall input. The output pulse width is based on the

TACH R-C resistor and capacitor values.

HALL A, B & C -

are open collector output complements of

each hall input. These can be tailored to a number of out-

put levels required (5V, 15V) and can be used for direction

detection in a torque loop/velocity loop control application.

Maximum current should be less than 10mA.

BRAKE -

is a pin for commanding the output bridge into a

motor BRAKE mode. When pulled low, normal operation

commences. When pulled high, the 3 high side bridge

switches turn on, causing rapid deceleration of the motor

and will cease motor operation until pulled high again. Logic

levels for this input are TTL compatible. It is internally

pulled high.

DIS -

is a pin for externally disabling the output bridge. A

CMOS logic low will enable the bridge and a CMOS logic

high will disable it. It is internally pulled up be a 100µAamp

pullup.

PRELIMINARY Rev. - 5/99

APPLICATION NOTES CONTINUED

COMMUTATION TRUTH TABLE

HALL SENSOR PHASING

120°

60°

COMMAND

= POS.

COMMAND

= NEG.

BRAKE

HALL HALL HALL HALL HALL HALL

AØ

BØ

CØ

AØ

BØ

CØ

High Level

Low Level

Don't Care

= SOURCE

= SINK

= OPEN

NOTE:

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

COMMAND

POSITIVE and I

COMMAND

NEGATIVE states.

PRELIMINARY Rev. - 5/99

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 7 and 9. Additional grounds, pins 23 and 25 are isolated grounds that connect 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 4471 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 dissipation 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.

PRELIMINARY Rev. - 5/99

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