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L585D1 Datasheet(PDF) 3 Page - STMicroelectronics |
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L585D1 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 9 page PIN FUNCTIONS N ° Name Functions 1 Alternator Voltage Sensing Connection for voltage regulation sensing. The regulation sensitivity is a function of R1 and is given by : S= ∆ VA ∆ R1 = 0.5mV ⁄ Ω 2-3 Filter Capacitor A capacitor connected between these two pins filters the feedback signal from the regulated output. Typically the input impedance is 15K Ω. 4 Alternator Overvoltage Adjustment When this pin is left open circuit the overvoltage threshold is a described in the specification. Typically the warning lamp is switched on when the voltage at this pin is greater than 3.5V. This threshold can be modified with a resistor between either the ground or pin 2. 5 GND This pin must be connected to ground. 6 Darlington Driver This pin drives the external darlington disabling it by shorting the current in RB to ground. 7-8-9 N.C. These pins must be left floating. 10 IC Supply Voltage Supply Voltage Input A 7.5V (typical) Zener is present at the input. 11 Oscillator Capacitor A capacitor connected to ground sets the frequency of the internal oscillator. The frequency is given by : fosc = 20 x 10 −6 8.4 x Cosc 12 GND This pin must be connected to ground. 13 Lamp Driver Current Driver for External Lamp for Diagnostics. Internally protected agains short circuits (current limiting), load dump transients and, by means of a zener, against low energy spikes. 14 NC Not connected. 15 Phase Voltage Sensing. Connection for no charge sensing from the alternator . The internal low threshold is typically 2.4V. By means of the external divider R3/R4 the threshold can be adjusted to give the required sensitivity. 16 Battery Voltage Sensing Connection for Voltage Battery Sensing This pin senses a failure of the alternator-battery lead as the voltage difference VA-VS. The external resistor R2 limits the current in overvoltage protection. L585 3/9 |
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