OM9369 International Rectifier Corp., OM9369 Datasheet - Page 5

• Manufacturer Part Number: OM9369
• Description: Full-featured Power Module For High Voltage Direct Drive Of 3-phase Brushless Dc Motor
• Manufacturer: International Rectifier Corp.

The OM9369 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
capcitors are charged during initial start-up. However,
the method(s) used to ensure this may be dependant
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 200Ps (all high-
side drivers are disabled and all low-side drivers are
enabled).
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APPLICATIONS
Start-Up Conditions
Fig 1: Start-Up Circuit
This may not be adequate for other applications;
while maintaining a constant speed command, (above
zero), RC_BRAKE (pin 16) may have to be momentarily
connected to ground via a switch, either manually or
electronically (ref. Figure 1). Note that with the
component values shown in Figure 1, RC_BRAKE
is pulled for low for approximately 300ms after
applying Vcc at pin 1.
OM9369
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