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L6585D Datasheet(PDF) 5 Page - STMicroelectronics |
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L6585D Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 25 page L6585D Pin settings 5/25 2.2 Functions Table 1. Pin functions Pin num. Name Function 1OSC An external capacitor to GND fixes the half-bridge switching frequency with a ±3% precision. 2RF Voltage reference able to source up to 240µA; the current sunk from this pin fixes the switching frequency of the half-bridge for each operating state. A resistor (RRUN) connected to ground sets the half-bridge operating frequency combined with the capacitor connected to the pin OSC. A resistor connected to EOI (RPRE) – in parallel with RRUN – sets the maximum half-bridge switching frequency during pre-heating. 3EOI Connected to ground by a capacitor that, combined with RPRE, determines the ignition duration Pre-heating: low impedance to set high switching frequency Ignition and run mode: high impedance with controlled current sink in case of HBCS threshold triggering. 4Tch Pin for setting the pre-heating time and the protection intervention. Connect a RC parallel network (RD and CD) to ground Pre-heating: the CD is charged by an internal current generator. When the pin voltage reaches 4.63V the generator is disabled and the capacitor discharges because of RD; once the voltage drops below 1.52V, the preheating finishes, the ignition phase starts and the RDCD is discharged to ground. Run mode: according to the kind of fault (either over-current or EOL) the internal generator charges the RC parallel network and appropriate actions are taken to stop the application. During proper behavior of the IC, this pin is low impedance. 5EOLP Pin to program the EOL comparator. It is possible to select both the EOL sensing method and the window comparator amplitude by connecting a resistor (REOLP) to ground. 6EOL-R Input for the window comparator and re-lamp function. It can be used to detect the lamp ageing for either “lamp to ground” and “block capacitor to ground” configurations. According to the EOLP pin setting, it is possible to program: – the window amplitude (VW) – the center of the window (VSET) either fixed or in tracking with the PFC output bus. This function is blanked during the ignition phase. In case of either lamp disconnection or removal, a second threshold (VSL-UP) crossing latches the IC and drives the chip in “ready-mode” so that when the voltage at EOL-R pin is brought below VSL-DOWN (re-lamp) a new pre- heating/ignition sequence is repeated. 7CTR Input pin for: – PFC over-voltage detection: the PFC driver is stopped until the voltage returns in the proper operating range – Feedback disconnection detection – reference for End-of-life in case tracking reference; – shut-down: forcing the pin to a voltage lower than 0.75V, the IC shuts down in unlatched condition. 8MULT Main input to the multiplier. This pin is connected to the rectified mains voltage via a resistor divider and provides the sinusoidal reference to the PFC current loop. |
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