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L6585DE 数据表(PDF) 5 Page - STMicroelectronics |
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L6585DE 数据表(HTML) 5 Page - STMicroelectronics |
5 / 33 page L6585DE Pin settings 5/33 Pin n. Name Function 4Tch Pin for setting the preheating time and protection intervention. Connect an RC parallel network (Rd and Cd) to ground. Preheating: the Cd is charged by an internal current generator. When the pin voltage reaches 4.63 V the generator is disabled and the capacitor discharges because of Rd. Once the voltage drops below 1.5 V, the preheating finishes, the ignition phase starts and the RdCd is pulled to ground. Ignition and Run mode: During proper behavior of the IC, this pin is low impedance. During a fault (either over-current or EOL) the internal generator charges the Cd to 4.63 V and then another current generator discharges the same capacitor. In this way, Cd sets the fault timing (shorter than preheating time). 5EOLP Pin to program the EOL comparator. It is possible to select both the EOL sensing method (fixed reference or reference in tracking with CTR) and the window comparator amplitude by connecting a resistor (REOLP) to ground. 6EOL Input for the window comparator. It can be used to detect lamp ageing for either “lamp to ground” or “block capacitor to ground” configurations. This function is blanked during the ignition phase. 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 EOL comparator (in case tracking reference) - The pin can be used also for shutdown 8MULT Multiplier external input. This pin is connected to the rectified mains voltage via a voltage divider and provides the sinusoidal reference to the PFC current loop. 9COMP Output of the error amplifier. A compensation network is placed between this pin and INV to achieve stability of the PFC voltage control loop and ensure high power factor and low THD. 10 INV Inverting input of the error amplifier. Output voltage of the PFC pre-regulator is fed to the pin through a voltage divider. 11 ZCD Boost inductor demagnetization sensing input for PFC transition-mode operation. A negative-going edge triggers PFC MOSFET turn-on. During startup or when the voltage is not high enough to arm the internal comparator, the PFC driver is triggered by means of an internal starter. 12 PFCCS Input to the PFC PWM comparator. The current flowing through the PFC MOSFET is sensed through a resistor. The resulting voltage is applied to this pin and compared with an internal sinusoidal-shaped reference, generated by the multiplier, to determine the PFC MOSFET’ s turnoff. A second comparison level detects abnormal currents (due to boost inductor saturation, for example) and, on this occurrence, shuts down the PFC gate. An internal LEB prevents undesired function triggering. Table 1. Pin functions (continued) |
类似零件编号 - L6585DE |
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类似说明 - L6585DE |
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