SMC6G50-60B [SENSITRON]
Brushless DC Motor Controller, 55A, CDFM43, POWER, HERMETIC SEALED, DFP-43;
| 型号： | SMC6G50-60B |
| 厂家： | 
SENSITRON |
| 描述： | Brushless DC Motor Controller, 55A, CDFM43, POWER, HERMETIC SEALED, DFP-43 局域网 电动机控制 CD |
| 文件： | 总16页 (文件大小：424K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Brushless DC Motor Driver Module in a Power Flatpack
600V, 20A to 80A
FEATURES:
• Fully integrated 3-Phase Brushless DC Motor Control Subsystem
includes power stage, non-isolated driver stage, and controller stage
• IGBT Output Stage
• 20A to 60A Average Phase Current with 300V DC Bus Voltage
• Internal Precision Current Sense Resistor (20W max. dissipation)
• Cycle by cycle current limiting.
• Fixed frequency PWM from zero speed to full speed.
• Closed-loop Speed Control of Motor
• Direction Input for direction reversal of Motor
• Tacho output with average output proportional to speed
• Brake Input for Dynamic Braking of Motor
• Overvoltage/Coast Input for Shutdown of All Power Switches
• Enable/Disable input.
• Hermetic Device Part # (SMC6MXX-XX), (3.10" x 2.10" x 0.385")
• Non-Hermetic Device Part # (SMC6MXX-XX-1), (3.10" x 2.10" x 0.475")
APPLICATIONS:
• Fans and Pumps
• Hoists
• Actuator Systems
DESCRIPTION:
The SMC6GXX-XX is an, integrated three-phase brushless DC motor controller/driver subsystems
housed in a 43 pin power flatpack. The SMC6GXX-XX is best used as a two quadrant speed controller for
controlling/driving fans, pumps, and motors in applications which require small size. Many integral control
features provide the user much flexibility in adapting the SMC6GXX-XX to specific system requirements.
The small size of the complete subsystem is ideal for aerospace, military, high-end industrial, and medical
applications.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
SIMPLIFIED BLOCK DIAGRAM
Fig. 1: Block Diagram
1- Switching frequency is internally set to 20 kHz, typically.
2- Power ground Pins 27 & 28 shall not be externally
connected to signal ground Pin 19.
3- Contact factory for custom options of the current limit sense
resistor. Typical values are 5, 10, 20, 30, 50, 60 m Ohms.
4- Over-current limit is adjustable by Pin 9.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
COMMUTATION TRUTH TABLE
This table shows the Phase Output state versus the state of the Hall-Effect and Direction Inputs. The commutation
coding shown reflects Hall-Effect sensors that are spaced at 120o mechanical increments. Also, internal protection
logic disables all three Phase Outputs when the Hall-Effect Inputs are set to an illegal condition (i.e., all logic low or all
logic high).
DIGITAL INPUTS
PHASE OUTPUTS
Dir
1
H1
0
0
0
1
1
1
1
1
1
0
0
0
0
1
H2
0
1
1
1
0
0
0
0
1
1
1
0
0
1
H3
1
1
0
0
0
1
1
0
0
0
1
1
0
1
A
B
C
.
Hi-Z
Sink
Sink
Hi-Z
Source Hi-Z
Source Sink
Sink
Hi-Z
Source Hi-Z
Source
Source
1
1
1
1
1
0
0
0
0
0
0
X
X
Source Sink
Sink
Hi-Z
Sink
Sink
Hi-Z
Source Sink
Source Hi-Z
Source Hi-Z
Hi-Z
Sink
Source
Source
Hi-Z
Sink
Hi-Z
Hi-Z
Hi-Z
Source Sink
Hi-Z
Hi-Z
Hi-Z
Hi-Z
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
ABSOLUTE MAXIMUM RATINGS
Characteristic
Maximum
400V
Motor DC Bus Supply Voltage
Motor Peak Voltage
600V
Average Output Current SMC6G20-60
SMC6G50-60
15 A
40A
70A
20 A
55A
90A
18 V
SMC6G80-60
Peak Output Current
SMC6G20-60
SMC6G50-60
SMC6G80-60
Control Supply Voltage VCC
Logic Input Voltage (Note 1)
-0.3 V to +8 V
Reference Source Current
-30 mA
Logic Input Voltage
Error Amplifier Input (EA1+/EA1-)
Error Amplifier Output Current
-0.3 to +8 V
-0.3 to +10 V
±8 mA
Spare Amplifier Input Voltage (EA2+/EA2-)
Spare Amplifier Output Current
-0.3 to +10 V
±8 mAdc
Current Sense Amplifier Input Voltage (ISH/ISL)
Current Sense Amplifier Output Current
Tachometer Output Current
-0.3 V to +6 V
±10 mAdc
+/- 10 mA
- 0.3 V to +6 V
-55 oC to +150 oC
1.2 oC/W
PWM Input Voltage
Operating Junction Temperature
Power Devices Thermal Resistance RthjC
Pin-to-Case Voltage Isolation, at room conditions
Lead Soldering Temperature, 10 seconds maximum, 0.125” from case
* Tcase = 25° C
600V DC
300°C
Recommended Operating Conditions (TC=25 oC)
Characteristic
Maximum
Motor Supply Voltage
300V
Average Output Current SMC6G20-60
SMC6G50-60
15 A
35A
60A
SMC6G80-60
Control Supply Voltage VCC
15 V +/-10%
Note 1: Logic Inputs: Direction, Hall Inputs (H1...H3) Over-voltage - Coast, Speed, and Quad Select.
Note 2: The internal current sense resistor is limited to 6 Watt dc power dissipation. Other values are available.
Please contact the factory for more information.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
MIN.
TYP.
MAX.
UNITS
PARAMETER SYMBOL CONDITIONS (NOTE 1)
Power Output Section
Collector-Emitter Leakage Current ICES at VCE=480V
250
uA
Collector-to-Emitter Saturation Voltage VCEsat, at VCC=15V
SMC6G20-60……………IC=15A
SMC6G50-60……………IC=40A
SMC6G80-60……………IC=70A
Diode Forward Voltage
2.2
2.2
2.5
V
1.9
1.4
1.6
SMC6G20-60……………IC=15A
SMC6G50-60……………IC=40A
SMC6G80-60……………IC=70A
Diode Reverse Recovery Time trr IF = 20A, di/dt = -200A/usec,
Control Section
V
190
nSec
Control Supply Current Icc at Vcc =12V
Control Turn-On Threshold Vcc(+) Tc over operating range
Driver Turn-On Threshold Vcc(+) Tc over operating range
5V Reference Section
30
11.0
10.0
mA
V
V
9.0
8.0
10.5
9.0
Output Voltage Vref
Output Current Io
4.7
-
-
5.0
-
-
5.3
30
30
V
mA
mV
Load Regulation Iload = 0mA to –20mA
Error Amplifier / Spare Amplifier Sections
EA1 / EA2 Input Offset Current Ios V(pin 2) = V(pin 4) = 0V
V(pin 3) = V(pin 6) = 0V
EA1 / EA2 Input Bias Current Iin V(pin 2) = V(pin 4) = 0V
V(pin 3) = V(pin 6) = 0V
-
-
6
75
nA
nA
100
500
Input Offset Voltage, VCM=0V
-
1.5
-
11
0.1
5
9
-
mV
V
V
Amplifier Input Common-mode Voltage Range Vcc=12V
Amplifier Output Voltage Range V OH
Amplifier Output Voltage Range V OL
PWM Comparator Section
0
10
-
0.5
V
Propagation Delay Time
Input Common Mode range
70
2.0
-
150
8.0
nsec
V
Current-Sense Amplifier Section
ISH / ISL Input Voltage Range
Input Offset Voltage
Input Bias Current
Amplifier Voltage Gain
High Level Output Voltage, Iout =-100 uA
Low Level Output Voltage , Iout =100 uA
Output Source Current
-0.5
-
5
4.75
6.0
-
-
-
Vcc – 1.0
8
V
mV
uA
V
V
mV
uA
10
5.0
-
-
-
15
5.25
-
70
-
300
Over-Current Comparator
Input Common-mode Range
Propagation Delay Time
0.0
40
-
50
260
V
nsec
170
Logic Input Section
H1, H2, H3 High-Level Input Voltage Threshold
H1, H2, H3 Input Hysteresis
H1, H2, H3 Input Current, 0.0 < Vin <5.0V
1.7
0.6
-
1.9
-
-30
2.1
1.0
-
V
V
uA
Cost, Start/Stop High-Level Input Voltage Threshold
Cost, Start/Stop Low -Level Input Voltage Threshold
3.6
-
-
-
-
V
V
1.9
Quad, Brake, Dir in High-Level Input Voltage Threshold
Quad, Brake, Dir in Low-Level Input Voltage Threshold
3.6
-
-
-
-
V
V
1.9
Tachometer
Tachometer Output High Level Voh
Tachometer Output Low Level Vol
Tachometer On-Time ton
4.7
-
90
5.0
-
120
5.3
50
140
V
mV
us
Tachometer On-Time Variation
Speed Input Threshold Voltage Vth
Oscillator Section
Oscillator Frequency fo
Over-Temperature Shutdown
Trip Temperature
0.200
18
0.250
20.0
0.280
22.0
V
kHz
135
115
145
125
155
135
Reset Temperature
oC
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
SPECIFICATION NOTES:
1- All parameters specified for Ta = 25C, Vcc = 15Vdc, and all Phase Outputs unloaded. All negative currents shown are sourced
by (flow from) the pin under test
2- Either ISH or ISL may be driven over the range shown.
3- Pulse Test: Pulse Width < 300 µSec, Duty Cycle < 2%.
PINOUTS
PIN#
1
2
3
4
5
6
7
8
NAME
PIN#
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
NAME
VCC
Speed Input
Direction Input
CSH
EA1 “-” Input
EA2 “+” Input
EA1 “+” Input
+5V Reference Output
EA2 “-” Input
EA2 Output
EA1 Output
Ioc Ref
CSL
+VDC Return
+VDC Return
Source C
Source C
9
Phase C Output
Phase C Output
+VDC
Source B
Source B
Phase B Output
Phase B Output
+VDC
Source A
Source A
10
11
12
13
14
15
16
17
18
19
20
21
22
Direction Out
Iso
ISH
ISL
Quad Select Input
Tachometer Output
Brake Input
Over-voltage/Coast Input
Start/Stop Input
Ground
HC Input
HB Input
HA Input
39
40
41
42
43
(Case)
Phase A Output
Phase A Output
+VDC
(No Connection)
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Fig. 2: Mechanical Outline For Hermetic Package, SMC6MXX-XX
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Fig. 3: Mechanical Outline For Plastic Case Package, SMC6MXX-XX-1,
And Lead Bending Options for both Hermetic and Plastic Packages
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Pin Descriptions
Vcc ( Pin 1 ), is the input biasing supply connection for the controller. Under-voltage lockout
keeps all outputs off for Vcc below 10.5V. Vcc pin should be connected to an isolated 15V
power supply. The return of Vcc is pin 19.
EA1- ( Pin 2 ), is the error amplifier inverting input.
EA2+ ( Pin 3 ), is the non-inverting input of a spare amplifier.
EA1+ ( Pin 4 ), is the error amplifier non-inverting input. EA1- and EA1+ are not internally
committed to allow for a wide variety of uses. They can be connected to Io for current-mode
control, or Tach output for voltage-mode control.
+5V Ref( Pin 5 ), is a 5V reference with 30mA of maximum available output current. This pin
should bypassed to Gnd with 1-5mF capacitor depending on the load current.
EA2- ( Pin 6 ), is the inverting input of a spare amplifier.
EA2 ( Pin 7 ), out is the output of a spare amplifier.
EA1 ( Pin 8 ), out is the output of the error amplifier and is internally connected to the PWM
comparator.
Ioc-Ref ( Pin 9 ), is the overcurrent reference voltage. It is internally set to 1.15V. This
reference can be reduced by connecting a resistor between Ioc Ref and Gnd . The resistor
value is
R= (Ioc-Ref) /(0.05 - 0.043*(Ioc-Ref)) KW
(1)
Also, Ioc Ref can be increased by connecting a resistor between Ioc Ref and the 5V
reference. The resistor value is
R= (5.0 – (Ioc-Ref))/(0.043*(Ioc-Ref) – 0.05) KW
(2)
This pin is connected to the overcurrent comparator for cycle-by-cycle current limiting. The
overcurrent reference voltage is set according to the formula
Ioc-Ref=Rs*Ip*5 volts
(3)
Where Rs is the current sense resistor value in ohms and Ip is peak current limit in amperes.
Dir out ( Pin 10 ), is direction output representing the actual direction of the rotor as
decoded from the hall sensors. There are two valid transitions of the hall sensor inputs; one
translates to a clockwise rotation and another which translates to a counterclockwise rotation.
The polarity of Dir-out is the same as Dir-in while motoring.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Is-out ( Pin 11 ), is the absolute value output of the current sense amplifier.
Is-out = ABS(ISL – ISH) (4)
ISH ( Pin 12 ), is the non-inverting input of the current sense amplifier.
ISL ( Pin 13 ), is the inverting input of the current sense amplifier.
Quad ( Pin 14 ), is the select input of two-quadrant (Quad=0) or four-quadrant (Quad=1)
operation.
Tach-out ( Pin 15 ), is a fixed pulse width variable frequency output proportional to the
motor speed. A pulse is generated at both rising and falling edges of HA, HB, HC inputs. So
this output can be used as a true tachometer for speed feedback. with an external filter or
averaging circuit which usually consists of a resistor and capacitor.
Brake ( Pin 16 ), is a digital input which causes the device to inter into brake mode. In brake
mode all three low-side switches are turned off and high-side switches are turned on. The
only conditions that can inhibit the high-side command during brake mode are UVLO, the
output of the PWM comparator, Coast input, or Start/Stop input.
Coast ( Pin 17 ), is a digital input that disables all outputs once pulled high. This input is
internally pulled low.
Start/Stop ( Pin 18 ), is a digital input that disables all outputs once pulled low. This input is
pulled high internally. This input can be used as enable/disable input using a switch. If the
switch is opened, the controller is enabled. If the switch is closed to Gnd, the controller is
disabled.
Signal Gnd ( Pin 19 ), is the reference ground for all control signals of the device. All bypass
capacitors, loop compensation components must be connected as close as possible pin 19.
This pin should not be externally connected to the power ground pins 27 and 28.
HC ( Pin 20 ), is hall input of phase C.
HB ( Pin 21 ), is hall input of phase B.
HA( Pin 22 ), is hall input of phase A.
HA, HB, HC are designed to accept rotor position information from hall sensors positioned
120o apart. Motors with 60o position sensing may be used if one or two of the hall-effect
sensor signals is inverted prior to connection to the hall-effect inputs.
HA, HB, HC inputs are internally pulled up, zener clamped to 6.2V, and filtered.
Speed-in ( Pin 23 ), is a speed input to latch the direction input when the motor is spinning
fast.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Dir-in ( Pin 24 ), is the direction digital input. Logic “H’ correspond to forward rotation, and
logic “L” correspond to reversed rotation.
The direction input can be latched by Speed-in input. As long as Speed-in is less than
0.250V, the direction latch is transparent. When Speed-in is higher than 0.250V changing
direction of rotation will enable coast until the Speed-in drops below 0.250V. Direction latch is
recommended in two-quadrant operation mode to allow the motor to coast to a safe speed
before reversing.
CSL ( Pin 25 ),is the positive terminal of the current sense resistor.
CSL ( Pin 26 ),is the negative terminal of the current sense resistor.
The current sense terminals produce a differential voltage equal to the motor current times
the sense resistance (5 or 10 mW typical). There is an internal 2nF filter capacitor across pins
25 and 26, There is also a 100 W resistor between each pin and each end of the current
sense resistor. Pins 25 and 26 shall be externally connected to pins 12 and 13 to activate
the cycle-by-cycle current limiting.
+VDC Rtn ( Pins 27 & 28 ), are the motor supply return. Pins 27 and 28 should not be
connected to the signal Gnd pin 19.
Source Terminals ( Pin 29, 30, 34, 35, 39, 40 ), are the source terminals of the three arms
of the three-phase bridge. These pins shall be shorted together externally using a low
impedance bus to minimize power loss.
Phase C Outputs ( Pin 31, 32 ), are phase C terminals. Both terminals shall be used.
Phase B Outputs ( Pin 36, 37 ), are phase B terminals. Both terminals shall be used.
Phase A Outputs ( Pin 41, 42 ), are phase A terminals. Both terminals shall be used.
+VDC ( Pins 33, 38, 43 ), are the motor input power supply positive terminal. These pins
shall be shorted together externally using a low impedance bus. +VDC bus should bypassed
to +VDC Rtn with adequately voltage-rated low ESR capacitor, whose value can is least 10-
15mF per ampere of average motor current.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Application Information
60o Rotor Position Sensing
SMC6MXX-XX is designed to operate with 120o position sensing encoding. In this
format, the three position sensor signals are never simultaneously high or low. Motors
whose sensors provide 60o encoding can be converted to 120o using the circuit shown
in Fig. 4.
Two-Quadrant vs Four-Quadrant
In two-quadrant mode only one switch is modulated at any time while in four-quadrant
operation two switches are modulated. This results in a more efficient controller and less EMI
emission when operating in two-quadrant mode. However, two-quadrant mode has some
limitations as explained below.
Fig. 5 illustrates the four possible quadrants of operation for a motor. Two-quadrant mode
refers to a motor operating in quadrants I and III. With a two-quadrant BDC motor, friction is
the only force to decelerate the load. Four-quadrant control provide controlled operation in all
quadrants, including II and IV, where torque and rotation are of opposite directions.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
When configured in two-quadrant mode, Quad=0, SMC6MXX-XX modulates only the high-
side devices of the output power stage. The current paths within the output stage during the
PWM on and off times are illustrated in Fig. 6. During the on time, both switches S1 and S4
are on, the current flows through both switches and the motor winding. During the off time, the
upper switch S1 is shut off, and the motor current circulates through the lower switch S4 and
D2. The motor is assumed to be operated in quadrants I or III.
If operation is attempted in quadrants II or IV by changing the Dir input, S1 and S4 are turned
off and S2 and S3 are turned on. Under this condition motor current very quickly decays,
reverses direction and increases until the overcurrent limit is reached. At this point , S3 turns
off and the current circulates in S2 and D4 and continue to rise due to the fact that the back
emf is in-phase with the current because the motor direction has not changed yet. Fig. 7
illustrates the current path in this case. Under these conditions there is nothing to limit the
current other than the controller and the motor impedance. These circulating currents can
result in damage to the power stage if the load inertia is high.
In four-quadrant mode, Quad=1, both upper and lower switches are modulated. Motor current
always decays during off time, eliminating any uncontrolled circulating current. In addition, the
current always flows through the current sense resistor. Fig. 8 illustrates the current paths
during torque reversal.
It is recommended in two-quadrant operation to utilize the speed input, pin 23, for safe
direction reversal. The direction input can be latched by speed input. As long as Speed-in is
less than 0.250V, the direction latch is transparent. When Speed-in is higher than 0.250V
changing direction of rotation will enable coast until the Speed-in drops below 0.250V. The
Speed-in signal is obtained by low-pass filtering the Tach output, pin 15, using RC filter.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
Control Modes
Typically, speed regulation is achieved by regulating the average input voltage to the motor,
while torque regulation is achieved by current control. Voltage and current control loops may
be combined to achieve a specific speed-torque curve.
Voltage-Mode Control
Fig. 9 shows the implementation of a typical speed control loop. A voltage command
proportional to the desired speed is applied at pin4 and can be set by a potentiometer, R3.
The speed feedback signal is obtained by low-pass filtering the Tach, pin15, output using R1
and C1. Small signal compensation of the speed control loop is provided by an internal error
amplifier. The integrating capacitor C2 places a pole at 0 HZ and a zero in conjunction with
R2. This zero can be used to cancel the low-frequency motor pole and to cross the loop with –
20dB gain response.
The output of the error amplifier is connected to the PWM comparator. Since the motor speed
is proportion to the average phase voltage, the speed is controlled via duty cycle control.
For open loop speed control, pin 2 shall be shorted to pin 8. The error amplifier acts as a
voltage follower and buffer to the command input.
Cycle-by-cycle current limiting is provided by connecting pins 25 and 26 to pins 12 and 13.
The overcurrent limit is set by the overcurrent reference IocRef at pin 9. This reference is set
internally to 1.15V, and can altered using a resistor externally, see equations (1) to (4) for
details. The current signal is filtered internally, and amplified with a gain of 5.
Current Mode Control
Fig. 10 shows the implementation of a typical torque control loop. A voltage command
proportional to the desired current is applied at pin 4 and can be set by a potentiometer, R3.
The current feedback signal, Iso at pin11, is obtained by the internal current sensor and the
absolute value amplifier. Small signal compensation of the feedback control loop is provided
by an internal error amplifier. The error amplifier output is connected to the PWM
comparator. Since the torque is proportional to the average phase current, the torque is
controlled via duty cycle control.
It is recommended to set the overcurrent limit reference IocRef at pin9 at a value slightly
higher than the maximum peak command current. This will maintain the cycle-by-cycle
current limiting even if the error amplifier saturates during large signal disturbance.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
SMC6GXX-60
SMC6GXX-60-1
SENSITRON
SEMICONDUCTOR
TECHNICAL DATA
DATA SHEET 4015, REV.-
DC Bus Filtering
To minimize the circuit parasitic inductance effect on the power stage, the layout of
Fig. 11 is suggested. C1, C2, and C3 are 0.1mF to 0.5mF ceramic capacitors,
connected across each leg of the three-phase bridge. Also, a bulk polarized capacitor
C4 of 10mF to 15 mF per ampere of average motor current should be connected
across the DC bus.
· 221 West Industry Court 3 Deer Park, NY 11729 3 (631) 586 7600, FAX 631 242 9798 ·
· World Wide Web - www.sensitron.com · E-mail Address - sales@sensitron.com ·
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