BC05A Datasheet PDF - Apex Microtechnology Corporation
| Part Number | BC05A | |
| Description | Motion Control | |
| Manufacturers | Apex Microtechnology Corporation | |
| Logo |  |
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MICROTECHNOLOGY
HIGH PERFORMANCE BRUSHLESS DC MOTOR DRIVER
BC05 • BC05A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
FEATURES
• 10V TO 200V MOTOR SUPPLY AT 5A CONTINUOUS
AND 10A PEAK OUTPUT CURRENT
• OPERATION WITH 10.8V TO 16V VCC, ALLOWING
NOMINAL 12V OR 15 V VCC SUPPLIES
• THREE PHASE FULL BRIDGE OPERATION WITH 2 OR
4 QUADRANT PWM
• AUTOMATIC BRAKING WHEN USING 2 QUADRANT PWM
www.DataSheet4•UT.cHoEmRMAL PROTECTION
• ANTI SHOOT THROUGH DESIGN
• 50 KHZ INTERNALLY SET PWM FREQUENCY, WHICH MAY
BE LOWERED WITH EXTERNAL CAPACITORS
• SELECTABLE 60° OR 120° COMMUTATION SEQUENCES
• COMMUTATION TRANSITIONS OUTPUT FOR DERIVING
DESCRIPTION
The BC05 Brushless DC Motor Controller provides the
necessary functions to control conventional 3-phase brushless
DC motors in an open loop or closed loop system. The BC05
SPEED CONTROL
• MAY BE USED OPEN LOOP, OR WITHIN A FEEDBACK
LOOP
• ANALOG MOTOR CURRENT MONITOR OUTPUT, MAY BE
USED FOR TORQUE CONTROL OR FOR TRANSCONDUC-
TANCE AMPLIFIER DRIVE.
is able to control motors requiring up to 1kW continuous
input power.
The controller drives the motor, generates the PWM,
decodes the commutation patterns, multiplexes the current
sense, and provides error amplification. Operation with
either 60° or 120° commutation patterns may be selected
with a logic input.
• ANALOG REFERENCE, FEEDBACK, AND TORQUE INPUTS
Current sense multiplexing is used to make the current
monitor output always proportional to the active motor
APPLICATIONS
coils current. Therefore the current monitor output may
be used in generating transconductance drive for easy
• 3 PHASE BRUSHLESS MOTOR CONTROL
servo compensation.
The controller may generate 4-quadrant PWM for applica-
BLOCK DIAGRAM
SSC
18
OE 19
HS1 6
HS2 7
HS3 8
120 22
REV 21
COMMUTATION
DECODE
LOGIC
tions requiring continuous transition through zero velocity, or
2Q
VCC
HV
20 2 9
TOP DRIVE 1
BOTTOM DRIVE 1
V+
1/2
BRIDGE
1
OUT 1
10
S1
2 quadrant PWM for
HV electrically quieter
operation in unidirec-
tional applications.
Direction of rotation
may be reversed in
13 2-quadrant mode by
BRIDGE
CONTROL
LOGIC
using the reverse
command input.
REF IN 23
V+ When in 2-quadrant
+
∑ ∑+
X10
X10
––
PWM
COMPARATOR
PWM
TOP DRIVE 2
BOTTOM DRIVE 2
1/2
BRIDGE
2
OUT 2
11
S2
15
mode if the motor is
stopped or deceler-
ating dynamic brak-
ing is automatically
FB 24
TEMP
SENSING
OVERTEMP
SHUTDOWN
TOP DRIVE 3
BOTTOM DRIVE 3
V+
1/2
BRIDGE
3
OUT 3
12
S3
applied. In this way
deceleration profiles
may be followed even
when using 2-quad-
rant PWM.
14
PWM
OSCILLATOR
POWER
FAULT OVERCURRENT
LOGIC
CURRENT
SENSING
SIGNAL
CONDITIONING
HV RTN
16
HV RTN
4
TORQUE
CT 3
17
FAULT
5
MOTOR I
GROUND 1
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
1
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OPERATING
CONSIDERATONS
BC05 • BC05A
OPEN LOOP OPERATION
The normal way of operating the controller open loop is
connect the input, REF IN pin 24 to a reference, and the
FB input, pin 24 to an analog voltage. When this is done
in conjunction with 2-quadrant PWM the voltage applied
to the motor coils will be:
Where:
VM = 25(HV)(VIN - VREF) + HV/2
HV is the motor supoply.
www.DataSheet4VUIN.ciosmthe input voltage.
VREF is the analog reference.
If 4-quadrant PWM is used the equation becomes:
VM = 50(HV)(VIN - VREF)
The input dynamic range can be as smnall as 36mV for
both 2-quadrant or 4-quadrant PWM (No larger than 40mV).
The dynamic range can be extended, with the penalty of gain
loss, by putting matched resistors in series with the FB and
REF IN inputs. The value of these resistors for a given dynamic
range is given by the following equation:
Where:
RIN = (VIN MAX/0.036) - 1
VIN MAX is the desired p-p input.
RIN is the required minimum value for the resistors to be put in
series with the FB and REF IN inputs, in kilo-ohms.
When these resistors are used gain is reduced. The new
motor voltage equation for 2-quadrant operation is:
VM = HV/2 + (25(HV)(VIN - VREF))/(RIN + 1)
The new equation for 4-quadrant operation is:
V = (50(HV)(V - V ))/(R + 1)
M
IN REF
IN
An alternative mode of open loop operation is to leave the
FB and REF IN inputs open, and connect the input to the
TORQUE input, either directly or through a series resistor.
When this is done the input signal is effectively referenced to
an internal 5.00V supply, VDD (This supply is not brought to a
pin). Just as when using the REF IN and FB inputs, dynamic
range can be increased (and gain decreased) by use of
a series resistor, but only one is required. For 2-quadrant
operation the equation for motor voltage is:
VM = HV/2 + (25(HV)(VDD - VIN))/(RIN + 10)
For 4-quadrant operation the equation for motor voltage is:
VM = (50(HV)(VDD - VIN))/(RIN + 10)
RIN can be determined for a linear dynamic range for
both 2-quadrant and 4-quadrant PWM from the following
equation:
RIN = (VIN MAX/0.036) - 10
OPERATION WITH NEGATIVE ANALOG INPUTS
The REF IN and FB inputs are inputs to a true differential
amplifier. These inputs operate over a range between signal
ground and +10V. However, with the addition 2 resistors,
a diode, and loss of gain the circuit will operate with input
voltages below ground. To operate with these inputs going
to -10V the gain loss is 26.5 dB. When used with an external
controller, which can compensate for this lost gain, this
is insignificant.
To choose a resistor to hold the input to the internal amplifier
within its range, use the following formula:
RIN = 2.06(4.9 + VIN) - 11.09
Where:
RIN is the minimum value of the external resistor in K-ohms.
VIN is the absolute value of the most negative input level.
A resistor of this value should be inserted in series with both
the REF IN and FB inputs. Since unbalance in these resistors
affects dc offset and common mode rejection, precision
resistors should be used. If the host system can produce steps
to the REF IN input with less than 11 µ-seconds transients
below ground on the internal amplifier will occur. Connecting
a diode with its cathode tied to pin 23, REF IN, and its anode
to ground will clamp these to a safe level.
EXAMPLE: Assume an input voltage of -10V. The formula
gives a minimum input resistance of 19.6K. The lowest
1% value above 19.6K is 20.0K. A nominal 20.0K resistor
2% low is 19.6K, so a 20.0K resistor whose variation to
all effects is 2% is safe..
CLOSED LOOP OPERATION
The controller may be operated in a closed loop by applying
the command signal to the REF IN input, pin 23, and analog
feedback to FB, pin 24. Or, if operating with resistors in
series with pins 23 and 24, through those resistor to pins
23 and 24. In this case the gain as a servo amplifier is
given by the equation of sections 2 or 3 of the "Open Loop
Operation" section.
TRANSCONDUCTANCE AMPLIFIER OPERATION
The BC05 can be operated in a transconductance amplifier
mode by connecting the MOTOR I output to the TORQUE
input either directly or through a resistor.
It is convenient to chose the current sense resistors for
the desired average current limit first, as described in section
1 of the protection circuits section, and then choose the
current feedback resistor for the desired transconductance.
If 2 quadrant PWM is being used the equation for calculating
transconductance is:
GM = 2.5(A)(V)(RFBI+10K)/(RL(RFBI+10K)+125000(V)(RS))
Where:
A is the gain of the Input Amp.
A=10K/(1K+RIN)
GM is the overall transconductance.
V is the motor supply voltage.
RL is the load resistance (terminal to terminal armature
resistance for the motor plus any added resistance.)
R is the sense resistance.
S
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
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