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參數(shù)資料
| 型號： | OM9375 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 25 Amp. Push-Pull 3-Phase Brushless DC Motor Controller/Driver Module in a Power Flatpack |
| 中文描述： | 25安培。推挽式三相無刷直流電動機控制器/驅(qū)動器的功率扁平封裝模塊 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 133K |
| 代理商： | OM9375 |
Test/Inspection
SFB
SF
SPP
Precap Visual Inspection
100%
Temperature Cycle
100%
N.A.
Mechanical Shock
100%
N.A.
Hermeticity (Fine and Gross Leak)
100%
N.A.
Pre Burn-In Electrical
100%
N.A.
Burn-In (160 hours)
100%
N.A.
Final Electrical Test
-55°C, +25°C,
+25°C
+125°C
Group A Testing
100%
N.A.
Final Visual Inspection
100%
APPLICATIONS
Start-Up Conditions
The
OM9375
3-phase
brushless
DC
motor
controller/driver is designed to drive fractional to
integral horsepower motors.
To ensure proper
operation, it is necessary to ensure that the high-side
bootstrap capacitors are charged during initial start-
up. However, the method(s) used to ensure this may
be dependent upon the application.
For example,
some applications may only require that OV_COAST
(pin 17) be connected to ground, either via a hardwire
connection or via a switch (Enable/Disable), before
applying
Vcc.
When
Vcc
is
applied,
the
controller/driver is forced into brake mode for
approximately 200
sec (all high-side drivers are
disabled and all low-side drivers are enabled).
This may not be adequate for other applications;
RC_BRAKE (pin 16) may have to be momentarily
connected to ground via a switch, either manually or
electronically (ref. Figure 3).
Note that with the
component values shown in Figure 3, RC_BRAKE is
pulled low for approximately 300 mSec after applying
Vcc at pin1.
Modes of Operation
Figures 4 and 5, shown on the following pages,
provide schematic representations of typical voltage-
mode and current-mode applications for the OM9375
controller/driver.
Figure 4 represents the implementation of a typical
voltage-mode controller for velocity control. A voltage
or speed command is applied to the noninverting input
of the error amplifier which is configured as a voltage
follower. The output of the error amplifier is compared
to a pulse width modulated ramp, and since motor
speed is nearly proportional to the average phase
output voltage, the speed is controlled via duty cycle
control.
If a speed feedback loop is required, the
tachometer output can be connected to the inverting
input of the error amplifier via a loop compensation
network.
Figure 4 also shows the implementation of the cycle-
by-cycle current limit/overcurrent protection feature of
the OM9375. The load current is monitored via the
controller’s internal sense resistor. The current sense
signal is filtered and fed into the current sense amplifier
where the absolute value of ISH-ISL is multiplied by two
and biased up by 2.5 volts. The output of the current
sense amplifier is compared to a fixed reference, thus
providing
cycle-by-cycle
current
limiting
and/or
overcurrent protection as necessary. The typical peak
current threshold (ISH-ISL) is 0.20 volts; the typical
over current threshold (ISH-ISL) is 0.30 volts.
Figure 5 represents the implementation of a typical
current-mode controller for torque control.
The load
current is monitored via the controller’s internal sense
resistor. The current sense signal is filtered and fed
into the current sense amplifier where the absolute
value of ISH-ISL is multiplied by two and biased up by
2.5 volts. Besides the implementation of the cycle-by-
cycle current limit/overcurrent protection feature of the
OM9375 discussed in the preceding paragraph, the
output of the current sense amplifier is fed into the error
amplifier which is configured as a differential amplifier.
An error signal representing the difference between the
current command input and the value of the amplified
current sense signal is produced. Then it is compared
to a pulse width modulated ramp and since torque is
nearly proportional to the average phase output
current, the torque is controlled via duty cycle control.
OM9375
2.1 - 9
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