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參數(shù)資料
| 型號： | OMC507 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | FULL-FEATURED CIRCUIT BOARD ASSEMBLY FOR DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTORS |
| 中文描述： | 全功能電路板裝配直接驅動3相無刷直流電動機 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 118K |
| 代理商： | OMC507 |
ENABLE INPUT (Pin 12) -- This input is the
enable/disable input to the OMC507.
TACHOMETER OUTPUT (Pin 13) -- This output
provides a fixed width 5V pulse when any Hall-Effect
Input (1, 2 or 3) changes state. The pulse width of the
Tachometer Output is set to 150
m
s (nominal). The
average value of the output voltage on pin 13 is directly
proportional to the motor's speed.
OFFSET MONITOR (Pin 14) -- This pin is used to
monitor the offset adjust voltage, set at RP1, to
accommodate the current sense amplifier offset,
approximately 2.5 volts.
VMOTOR(T1) - This terminal is connected to the most
positive terminal of the motor supply (Vm+).
MOTOR RETURN (T2) - This terminal is connected to
the most negative terminal of the motor supply (Vm-).
PHASE OUTPUTS (Phase, A T3; Phase B, T4; Phase
C, T5) -- These outputs are connected to either Vmotor
via the pull-up driver or Sense via the pull-down driver,
depending upon the Hall-Effect and Direction Inputs
(see Commutation Truth Table). The terminals
associated with each Phase Output must be connected
to one of the three phases of the motor driven by the
OMC507.
PIN DESCRIPTIONS / FUNCTIONALITY
VCC (Pin 1) -- The Vcc Supply input provides bias
voltage to all of the internal control electronics within
the OMC507, and should be connected to a nominal
+15Vdc power source.
GROUND (Pin 2) -- The voltages that control the
OMC507 are referenced with respect to this pin.
COMMAND (Pin 5) -- This input is the current
command input to the OMC507. For other
command configurations, consult the factory for
proper termination of this pin.
+5V_Hall (Pin 6) -- This output provides a
temperature-compensated,regulated +5V reference
to power the external Hall-effect motor position
sensors. By design, the +5V reference must be in
regulation before the remainder of the control
circuitry is activated. This feature allows the Hall-
effect sensors to become powered and enabled
before any Phase Output is enabled in the
OMC507, preventing damage at turn-on.
HALL_RTN (Pin 7) -- This pin is connected to
Ground onboard and is used as the +5V Hall return.
HALL_EFFECT INPUTS (Hall_A, Pin 8; Hall_B,
Pin 9; Hall_C, Pin 10) -- Each input has an internal
pull-up resistor to the +5V reference. Each input
also has an internal 2200pF noise filter capacitor to
Ground. Motors with 60 degree 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.
DIRECTION INPUT (Pin 11) - This input is used to
select the motor direction. This input has an internal
protection feature: the logic-level present on the
Direction Input is first loaded into a direction latch,
then shifted through a two-bit shift register before
interfacing with the internal output phase driver logic
decoder. Also, protection circuitry detects when the
input and the output of the direction latch or the 2-bit
shift register are different, and inhibits the Phase
Outputs (i.e. Hi-Z) during those times. This feature
may be used to allow the motor to coast to a safe
speed before a direction reversal takes place.
Power stage cross-conduction (current "shoot-
through" from Vmotor to Ground through
simultaneously enabled pull-up and pull-down
drivers) is prevented by the shift register as it is
clocked by the PWM oscillator, so that a fixed delay
of between one and two PWM oscillator clock cycles
occurs. This delay or "dead-time" guarantees that
power-stage cross-conduction will not occur.
2.1 - 6
OMC507
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