OM506 Просмотр технического описания (PDF) - Omnirel Corp => IRF

Номер в каталоге

Компоненты Описание

производитель

OM506

DC BRUSHLESS MOTOR CONTROLLER

Omnirel Corp => IRF 

Current Limit

OMC506

The OMC506 provides outputs from the internal current sense resistor (pin 7 & 8). These outputs can be

directly wired to the C.S.+, and C.S.- (pin 28 & 27) inputs. The outputs can also be used in external

current limit circuitry. Figure 2 shows a typical connection of the OMC506’s current limit circuitry

Figure 2 - Current Limit Circuitry

28

0.1uf

27

100

0.01uf

100

P/O OMC506

P/O MC33035

C.S. Amplifier

+

-

To control

logic

Im

8

Rs

0.01

7

Over Temperature Protection

The OMC506 has been designed with an internal over temperature protection circuit. The circuit provides

a diagnostic in the event an over temperature condition occurs in the power stage. The circuit normally

outputs a voltage level < 0.5Vdc. When the power stage reaches 140°C the VOUT (pin 19) will rise to

+15Vdc. The OMC506 also outputs a control function for this circuitry. A logic “0” at pin 18 will disable the

over temperature circuit and a logic “1” will force VOUT to go high. The over temperature circuitry has been

designed to interface with a system controller. The system controller can act on the pretense of an over

temperature and shut the OMC506 down. The system controller may opt to over ride the over temperature

flag and disable the circuit over temperature circuitry. In addition, the system controller can force the VOUT

high as part of a built in test (BIT) feature at the system level. The over temperature circuitry will reset

when the power stage has cooled to 130°C. Finally, an internal diode can be jumpered causing the

temperature circuitry to latch on trip, requiring a power off reset.

Typical Motor Connections

Figure 3 shows a typical application of the OMC506. The user must externally connect an electrolytic

capacitor (value is dependent on the application) bypassed with a ceramic decoupling capacitor. These

capacitors should be as close to the module as feasible. In addition, it is recommended that a transient

suppressor also be added in parallel with the external capacitors to prevent high voltage transients on the

motor bus.

2.1

2.1 - 9

Share Link: