OM9369CM datasheet(8/10 Pages) ETC

8 / 10 page

DIRECTION INPUT (Pin 25) - 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

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.

CURRENT SENSE OUTPUTS (CSH, Pin 26; CSL,

Pin 27) - The Current Sense Outputs produce a

differential voltage equal to the motor current times the

sense resistance value (5m

Ω nominal). There is an

internal 1000pF filter capacitor across pins 26 and 27,

and two 100

Ω series resistors, one between each pin

and each end of the current sense resistor.

configure the current sense amplifier for cycle-by-cycle

current limiting and/or overcurrent protection, connect

pin 26 to pin 13 (ISH) and pin 27 to pin 14 (ISL).

MOTOR RETURN (Pin A) - This pin is connected to

the most negative terminal of the motor supply (Vm-).

This connection is electrically isolated from the logic

Ground internal to the OM9369CM package to

minimize, if not eliminate, noise on the logic ground.

The connection to the logic ground is made by the user

external to the package (refer to Ground (pin 20)). In

order to minimize packaging losses and parasitic

effects, it is essential that both of these pins be firmly

connected to the motor supply ground, with as short a

connection as physically possible.

PHASE OUTPUTS (Phase A, Pin E; Phase B, Pin D;

Phase C, Pin C) -- These outputs are connected to

either Vmotor via the pull-up driver or Source via the

pull-down driver, depending upon the Hall-Effect and

Direction Inputs (see Commutation Truth Table). The

pin associated with each Phase Output must be

connected to one of the three phases of the motor

driven by the OM9369CM.

VMOTOR (Pin B) - This pin is connected to the most

positive terminal of the motor supply (Vm+).

For

proper operation, this pin must be connected

externally with a low impedance power bus.

The

Vmotor power bus should be bypassed with an

adequately voltage-rated ceramic capacitor, 0.1

µF

(typical), and a low-ESR electrolytic capacitor, whose

capacitance value can be selected by the following:

µF-per-Ampere of average motor current from

Vmotor to Motor Return.

Note: All connections, including the power bus

capacitor connections, must be made as close as

possible to the Vmotor and Motor Return pins to

minimize parasitic effects.

PACKAGE AND SCREENING OPTIONS

The OM9369CM is offered in a hermetic CERMODTM,

CM-1LP, as shown in Figure 1.

The OM9369CM operates over the full military

temperature range of -55°C to +125°C, and is

available with two standard screening levels, CMP,

limited screening, and CMB, MIL-STD-883 screening.

The screening levels for the CMP and CMB versions

are listed in the table below. All tests and inspections

are in accordance with those listed in MIL-STD-883.

Note: For lower bus voltages and MOSFET versions

in a CERMOD TM package contact the factory.

OM9369CM

2.1 - 8

Test/Inspection

CMB

CMP

Precap Visual Inspection

100%

Temperature Cycle

100%

N.A.

Mechanical Shock

100%

N.A.

Hermeticity (Fine and Gross Leak)

100%

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%

Table 1

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