MC33191

MOTOROLA

5

MC33191

FUNCTIONNAL DESCRIPTION

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specifically disclaims any and all liability, including without limitation consequential or incidental damages. ªTypicalº parameters which may be provided in Motorola

data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including ªTypicalsº

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Application /System Performances

1. Reluctance sensor input.

- Minimum input level of 200mV peak to peak

- Maximum input level of 40V peak to peak

2. Hall sensor input

- Open collector output desirable.

- Input level of 0.5V to V

bat

3. Operating voltage range

- Normal range from 9V to 16V.

-Operational

range

with

some

modiÞcations

to

parameters from 6V to 24V.

4. Transient considerations

- Load dumps should not exceed +90V peak with 250ms

time constant.

- Field decay should not exceed -90V peak with 25ms

time constant.

5. Operating temperature range

- Continuous operation : -30

°C to 125°C

6. Rate of acceleration should not exceed 250Hz/s from

20Hz to 300Hz (input frequency). If this is exceeded the

module will still function but an occasional spark may be

missed and dwell calculations will be negated for one or two

output cycles.

7. Normal operating frequency range is from 1Hz to

400Hz.

Application features and functions

1. Power on : On initial power up there will be no output

current and this condition will be maintained until the Þrst

input cycle is run at the input terminals.

2. Push start capability : The unit may be push started as

any input signal exceeding 200mV peak to peak will produce

a peak

3. Stall shutdown : If for a period of 5 seconds no input

signal is present, the unit will shutdown and output current

will be reduced at a rate slow enough to present a spark.

4. Automatic switching from a slow speed to run mode at

a preset frequency.

- No separate start wire into module is required

- Switch occurs at approximatly 12Hz but can be

changed within a narrow region

5. Input noise immunity is provided by hysteresis on the

input comparator.

- 100mV of hysteresis is in slow speed mode

- 500mV of hysteresis in run mode

6. Dwell control is modiÞed under different operating

conditions.

- In slow speed mode dwell follows the duty cycle of the

input signal

- In normal run mode dwell is controlled at 16% of cycle

time plus coil rise time to current limit level.

- At high speed (determined by coil rise time) dwell is

75% of input cycle time.

7. Output current is normally 5.5 +/- 0.5 Amps. It can be

operated at higher or lower limits if required. (Not excluding

7.5 Amps).

8. Start Retard

On slow speed mode, a retard signal is generated that is

inversely proportional to input frequency. The retard is

nominally 4.8% at 1Hz, (related to input duty cycle) and can

be modiÞed to meet other application requirement.

9. High voltage on the output transistor is nominally

clamped at 350V but can be adjusted if necessary.

10. High Battery voltage operation

- At a battery voltage of 16V the dwell is modiÞed in run

speed to 10% of cycle time plus coil rise time.

- At a battery voltage of approximately 30V the module

will shutdown to prevent damages to the output devices.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com