OM9369CM Ver la hoja de datos (PDF) - Omnirel Corp => IRF

Número de pieza

componentes Descripción

Fabricante

OM9369CM

FULL-FEATURED POWER MODULE FOR HIGH-VOLTAGE DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTORS

Omnirel Corp => IRF 

OM9369CM

APPLICATIONS

Modes of Operation

Figures 2 and 3, shown on the following pages,

provide schematic representations of typical voltage-

mode and current-mode applications for the

OM9369CM controller/driver.

Figure 2 represents the implementation of a typical

voltage-mode controller for velocity control. A voltage

or speed command is applied to the non-inverting

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 2 also shows the implementation of the cycle-

by-cycle current limit/overcurrent protection feature of

the OM9369CM. 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

MECHANICAL OUTLINE

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 3 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

OM9369CM 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.

Fig 1: Mechanical Outline CM-1LP CERMOD TM

2.1 - 9

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