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PD-95805
Closed Loop Speed Controller For 3-Phase Brushless DC Motor MP-3T Package
Description:
The OMC506 is an integrated, high density, three phase Brushless DC (BLDC) motor, speed controller housed in a MP-3Tpackage. The OMC506 contains the power, driver and control electronics to adjust timing functions and speed control loop parameters to optimize the controller for each application. The electronics contained in the OMC506 are assembled using mixed process technologies: surface mount components on a printed circuit board and chip & wire on an Insulated Metal Substrate.This combination offers small size, excellent thermal characteristics and electrically isolated heat sink.
OMC506
MP-3T
Features:
n 10A Average Phase Output Current n Over Temperature Protection n Compensation Circuitry Adjustable to
Motor Parameters
n Speed Controlled by 0 to 5V Linear
Input Signal
n Forward or Reverse Direction n Isolated, Low Profile Package
Absolute Maximum Ratings
Symbol
VM VM pk IO IOP IOSC VREF IREF VSPEED VTACH VCNTL VCS TOP
Parameter
Motor Supply Voltage Peak Motor Supply Voltage Average Phase Output Current Pulsed Output Current ( <1% Duty Cycle ) Oscillator Input Current ( Source or Sink ) Reference Output Voltage ( IREF = 1.0mA ) Digital Inputs ( Fwd / Enable / Brake / SA /SB / SC ) Reference Output Current ( VREF = 6.2V ) Speed Control Input Voltage Tachometer Input Voltage Temperature Control Input Voltage Regulator Output Current ( VREG + 15V ) Current Sense Input Voltage Operating Temperature Range 32 48 10 30 30 6.5 6.5 10 -0.3 to VREF -0.3 to VREF 6.2 100 -0.3 to 5.0 -25 to 85
Units
Vdc V A mA V mA V mA V C
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11/24/03
OMC506
Electrical Characteristics @ TJ = 25C (Unless Otherwise Specified)
Characteristics
REFERENCE Reference Output Voltage Reference Load Current OSCILLATOR Oscillator Frequency Sawtooth Peak Voltage Sawtooth Valley Voltage DIGITAL INPUTS High Input Treshhold Voltage Low Input Treshhold Voltage CURRENT SENSE Treshhold Voltage Input Common Mode Volt Range Input Bias Current VOLTAGE REGULATOR Output Voltage Load Regulation Output Trip Voltage Output Normal Voltage Trip Temperature Reset Temperature Internal Current Sense Resistor Junction-to-Case MOSFET Resist. Vth Vicr Vib V reg Ireg VOUT VON Ttrip Treset Rs Rthjc 85 14 13 137 129 9.5 101 3.0 -0.9 14.5 0.1 115 -5.0 15 0.3 mV V mA V % V V C C C/W T > T trip, RL = 100K Vih V il 3.0 2.2 1.7 0.8 V V FOSC VOSCpk VOSCva 22 1.2 25 4.1 1.5 28 4.5 KHz V V ROSC= 4.7K,COSC= 0.01mF VREF IREF 5.9 6.24 5.0 6.5 8.0 V mA IREF = 1.0mA
Parameter
Symbol Min. Typ. Max. Units
Test Conditions
10mA < IO < 100mA
THERMAL 13.31 14.79 0.13 145 137 10 0.4 150 142 1.6
10.5 mOhm
MP3 Package Application
A new mixed signal module fully integrates power, control functions, and drive circuitry into a single 2" x 4" x 0.48" package. The module provides closed loop speed control of three phase, brushless DC (BLDC) motors used in a variety of system applications. The OMC506 has been designed with flexibility in mind. Timing functions and loop parameters can be adjusted to optimize the OMC506 to each customer's application. In addition, the OMC506 has been designed into a MP-3T package. This package uses an insulated metal substrate, thereby, isolating the module's electronics from chassis while providing the necesssary thermal interface for proper performance. The OMC506 offers a high efficiency, flexible, compact, motion control system in an industry standard footprint.
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OMC506
Block Diagram
RT/CT VMOTOR VOUT CONTROL FOUT 6.2 V REF
OVER TEMP CKTRY TACHOMETER
SA SB SC
DRIVER A DRIVER B DRIVER C
COMPENSATION
A OUT
TACH IN VSPEED +15 V
B OUT
MOT
LOOP SHAPING
+15 V
C OUT
REGULATOR
RSENSE
RSENSE RSENSE RTN
FWD/REV OSC C.S.+ C.S.BRAKE ENABLE
THREE PHASE REFRESH
Controller
The OMC506 is based on the Motorola MC33035 Brushless Motor Control I.C. This controller is used in concert with the motorola MC33039 Closed Loop Brushless Motor Adapter I.C. to provide direct duty cycle control of the motor speed. The OMC506 provides two quadrant speed control via an analog 0 to 5V signal applied to the Vspeed ( pin22 ) input. The OMC506 is selected for 60/120 degree hall sensor spacing. The commutation truth table for the OMC506 is shown in Table 1.
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OMC506
Table 1 - Commutation Truth Table
Inputs SA
1 1 0 0 0 1 1 1 0 0 0 1 1 0 1 0 V V V
Outputs Enable
1 1 1 1 1 1 1 1 1 1 1 1 X X X 1 1 0 0
120 SB
0 1 1 1 0 0 0 1 1 1 0 0 1 0 1 0 V V V
SC
0 0 0 1 1 1 0 0 0 1 1 1 1 0 1 X V V V
F/R
1 1 1 1 1 1 0 0 0 0 0 0 X X X X X X X
Brake
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0
AOUT
1 0 0 0 1 0 1 1 0 0 0 0 0 -
BOUT
1 1 0 0 0 1 1 0 0 0 0 -
COUT
0 0 1 0 1 1 0 0 0 0 0 0 -
Fault
1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 0 0
Notes
1 1 2
Notes: 1) Invalid Sensor Inputs; X= Don't Care 2) V= Valid Sensor Input
Closed Loop Circuit
Additional amplifiers are used in the OMC506 to provide the necessary control loop compensation for extended bandwidth. By extending the bandwidth of the direct duty cycle control system, torque pertubations can be accounted for while regulating the speed of the motor. This allows the module to be used in relatively dynamic systems as well as constant torque applications. Internally, the compensation circuitry used for control loop shaping can be tuned to optimize the OMC506 for various applications. The OMC506 provides directional, braking, and enable interfaces from the controller I.C. (pins 32, 24 and 25, respectively). The module also allows the user to externally set the pulse width modulation (PWW) frequency (pin21) as well as the pulse width from the Closed Loop Brushless Motor Adapter (pin 34). This allows a common module to be used in many applications. Motor commutation and speed control are derived from the Hall effect sensor signals provided from the motor. The signals are provided as inputs to the OMC506 (pins 29, 30 and 31). The amplitude of the sensor signals must be limited, by the user, to +6.2V to insure proper operation of the module. Finally, the output from the Closed Loop Brushless Motor Adapter is provided as an output of the OMC506. This signal has fixed amplitude and pre-set pulse width. The frequency is six times that of the motor. This signal is integrated to produce a voltage proportional to motor speed.
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OMC506 Current Limit
The OMC506 provides outputs from the internal current sense resistor (pin 7& 8). These outputs can be directly wired to the C.S. +, C.S.- (pin 28 & 27) inputs. The outputs can also be used in external current limit circuitry. Figure 1 shows a typical connection of the OMC506's current limit circuitry.
Figure 1 - Current Limit Circuitry
Over Temperature Protection
The OMC506 has been designed with an internal over temperature protection circuit. The circuit provides a diagnostic in the event an over temperature condition occurs in the power stage. The circuit normally outputs a voltage level < 0.5Vdc. When the power stage reaches 140C, the VOUT (pin19) will rise to +15Vdc. The OMC506 also outputs a control function for this circuitry. A logic "0" at pin 18 will disable the over temperature circuit and a logic "1" will force VOUT to go high. The over temperature circuitry has been designed to interface with a system controller. The system controller can act on the pretense of an over temperature and shut the OMC506 down. The system controller may opt to over ride the over temperature flag and disable the circuit over temperature circuitry. In addition, the system controller can force the VOUT high as part of a built in test (BIT) feature at the system level. The over temperature circuitry will reset when the power stage has cooled to 130C. Finally, an internal diode can be jumpered causing the temperature circuitry to latch on trip, requiring a power off reset.
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OMC506
Typical Motor Connections
Figure 2 shows a typical application of the OMC506. The user must externally connect an electrolytic capacitor (value is dependant on the application) bypassed with a ceramic decoupling capacitor. These capacitors should be as close to the module as feasible. In addition, it is recommended that a transient suppressor also be added in parallel with the external capacitors to prevent high voltage transients on the motor bus.
Figure 2 - Typical Motor Connections
5V 634 0.1F 80.6K 6.65K
MOT
0.01F
0.01F
+ DISABLE 480F 145 C TRIP
DIAGNOSTIC
100K
FORCE TRIP
Conclusion
International Rectifier's OMC506 offers a complete motor control system, that is flexible in design, in a high density, high power industrial module. The assembly technology makes the OMC506 an ideal candidate in systems where package size is critical. This power module integrates all the functions necessary to control a DC brushless motor. The design of the OMC506 is flexible enough to be customized for various applications while still maintaining a turn-key solution to the end user. Finally, the MP310, as other industrial packages from International Rectifier, makes the user's mechanical interface simple while optimizing the thermal transfer from the module to the heatsink.
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OMC506 Mechanical Outline - MP-3T
.600 2.000 1.350 .325 .150 (4) PLCS. .250 .500
.135
.050 (34) PLCS. .150
2.450
3.000
4.000
.300 .500
.250
.020 .480 MAX. .180
Pin Designation
Pin No.
1 2 3 4 5 6 7 8 9 10
Designation
Power GND Power GND NC Phase C Phase C NC Rsense return Rsense + 15V Signal GND
Pin No.
11 12 13 14 15 16 17 18 19 20
Designation
Phase A Phase A NC Phase B Phase B Vm Vm Control VOUT 6.2 VREF
Pin No.
21 22 23 24 25 26 27 28 29 30
Designation
OSC Vspeed Tach Input Brake Enable Fault CS CS+ SC SB
Pin No.
31 32 33 34
Designation
SA Fwd / Rev FOUT (Tach) RT / CT
Note: Contact IR Leominster for lead bending options
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 IR LEOMINSTER: 205 Crawford St., Leominster, Massachusetts 01453, USA Tel: (978) 534-5776 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 11/03
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