L6585D STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

Datasheet sections

  • 1 Technical Overview
  • 2 Pin Connections and Internal Schematic
  • 3 Mechanical Data
  • 4 Order codes
  • 5 Revision history

Features

■ Pre-heating and ignition phases independently programmable ■ Programmable and precise End-of-life protection compliant with all ballast configurations ■ Half-bridge over-current control ■ Ignition voltage control ■ Automatic Re-lamp ■ 1.25µs dead time ■ 3% Oscillator precision ■ Transition mode PFC with over-current protection ■ PFC over-voltage protection and feedback disconnection ■ Under-voltage lock-out

Applications

■ Electronic ballast SO-20 Block diagram

1 Technical Overview

The L6585 is a ballast control IC with integrated Power Factor Corrector (PFC), designed in High-voltage BCD Off-line technology. This one-chip solution replaces a half bridge controller, a PFC controller, the relevant drivers and the logic necessary to build an electronic ballast. The pre-heating and ignition durations are independently settable as well as the half-bridge switching frequencies for each operating phase (pre-heating, ignition and normal mode) to serve many different lamp types. Another outstanding feature is the capability of limiting the voltage applied to the lamp to a constant value during the ignition phase. The PFC section operates in Transition Mode. The highly linear multiplier includes a special circuit, able to reduce AC input current distortion, that allows wide-range-mains operation with an extremely low THD, even over a large load range. Some IC features, like the under voltage lock-out and the PFC over-voltage and feedback disconnection controls can assure lamp protection. Furthermore, a double threshold comparator on the half bridge current sense provides a sort of current control and avoids the MOSFETs working in the capacitive mode. A double threshold comparator on the PFC current sense prevents the inductor saturation. Other features like the automatic re-lamp for lamp replacing, the failure to strike and the End-Of-Life control, simplify the lamp management. The programmability of the EOL windows comparator thresholds makes the L6585 the only lighting IC compliant with either "lamp-to-ground" or "block capacitor-to-ground" configurations. The driver of the PFC is able to provide 120mA (source) and 250mA (sink) and the drivers of the half-bridge provide 170mA source and sink.

2 Pin Connections and Internal Schematic

Figure 1. Pin connection (through top view) Figure 2. Typical System Block Diagram

3 Mechanical Data

In order to meet environmental requirements, ST offers these devices in ECOPACK ® packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 3. Package Dimensions Table 1. SO-20 Mechanical Data

4 Order codes

Table 2. Order codes

5 Revision history

Table 3. Document revision history 12-Jan-2006 1 Initial release.

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publicatio n are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectro nics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners © 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Ital y - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America