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L484D1 Datasheet(PDF) 6 Page - STMicroelectronics |
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L484D1 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 11 page DARLINGTON OVERVOLTAGE LIMITATION The darlington is protected against overvoltage by means of an external divider R5 /R6 (pin 15) and an internal zener. This zener drives the external dar- lington in order to limit the collector voltage. CHARGING ANGLE SIGNAL OUTPUT This signal is intended for tachometer applications (pin 5). It consists of an open collector stage with current internally limited at 10mA "POWER ON" SIGNAL INPUT In the low status this input forces the external dar- lington into conduction (pin 9). This control input can be used together with the conduction time informa- tion coming from pin 5 to bypass the normal dwell time calculation. When an external logic control is used to recognize particular engine condition (as in anti Knock system). PROTECTION CIRCUITS PERMANENT CONDUCTION PROTECTION This function is intended to prevent continuous cur- rent conduction in the final stage when the magnetic pickup is open or intermittent. The duration of the in- tervention is set by means of a capacitor 1 at pin 3. Grounding pins 3 or 4, this protection is eliminated. The inhibit function at pin 4 is particularly useful when an external logic control is used to disable the permanent conduction protection. REVERSE BATTERY AND DUMP PROTECTION Due to the external resistors R6, R7, R8, R10 the de- vice is protected against reverse battery. The load dump protection withstands up to 100V with a decay time ≤ 300ms. The intervention threshold for load dump is fixed by means of an external divider con- nected to pin 11. OTHER APPLICATION INFORMATION If the supply is voltage disconnected - or the battery wire is broken - while the current is flowing through the coil, the external diode D1 keeps the coil current from recirculating into the device : in this way both device and darlington are protected. The zener diode Dz, connected between pin 14 and GND, allows to withstand positive spikes up to 200V. The device - used in the recommended application circuit - satisfies the ISO/DP 7637/1 overvoltage standard. Figure 1 : Typical Magnetic Pick–up Waveform and L484 Response at low and high fequency. L484 6/11 |
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