Overview
The L6585DE is a highly integrated combo IC designed by STMicroelectronics for Power Factor Correction (PFC) and ballast control. This device combines a high-performance PFC controller with a ballast controller, along with the necessary drivers to build an electronic ballast. It is particularly suited for applications requiring high power factor correction and precise control over the ballast operation.
The IC features transition mode PFC with advanced protection mechanisms, including over-current protection, over-voltage protection, and under-voltage lockout. The ballast controller includes programmable end-of-life detection, hard switching events detection, and precise oscillator control.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 11 | 15 | 16 | V |
| Turn-on Threshold (VCC(on)) | 13.6 | 14.3 | 15 | V |
| Turn-off Threshold (VCC(OFF)) | 9.6 | 10.3 | 11 | V |
| Zener Voltage (VZ) | 16.7 | 17.1 | 17.5 | V |
| Operating Supply Current (ICC) | - | 20 | - | mA |
| PFC Gate Driver Output Current | - | 300 (source), 600 (sink) | - | mA |
| Half-Bridge Switching Frequency Precision | - | ±3% | - | - |
| Half-Bridge Dead Time | - | 1.2 µs | - | - |
Key Features
- PFC Section: Transition mode PFC with over-current protection, over-voltage protection, under-voltage lockout, PFC choke saturation detection, and THD optimizer.
- Half-Bridge Section: Programmable preheating and ignition phases, 3% oscillator precision, 1.2 µs dead time, programmable end-of-life protection, smart hard switching detection, and fast ignition voltage control with choke saturation detection.
- Protection Mechanisms: Over-current control, hard switching events detection, and capacitive mode/cross-conduction protection.
- High Current Capability Drivers: PFC gate driver capable of sourcing up to 300 mA and sinking up to 600 mA; half-bridge drivers capable of sourcing up to 290 mA and sinking up to 480 mA.
- Precision and Control: High-performance error amplifier and precise internal voltage reference for accurate control loops.
Applications
The L6585DE is designed for use in electronic ballast applications, particularly those requiring high power factor correction and precise control over the ballast operation. It is suitable for a wide range of lighting systems, including those using fluorescent lamps, high-intensity discharge (HID) lamps, and other types of gas discharge lamps.
Key application areas include:
- Fluorescent lighting systems
- High-intensity discharge (HID) lighting systems
- General lighting applications requiring high power factor correction
- Industrial and commercial lighting solutions
Q & A
- What is the primary function of the L6585DE IC?
The L6585DE is a combo IC designed for Power Factor Correction (PFC) and ballast control, integrating a PFC controller and a ballast controller with necessary drivers.
- What are the key protection mechanisms in the L6585DE?
The IC includes over-current protection, over-voltage protection, under-voltage lockout, PFC choke saturation detection, and hard switching events detection.
- How does the PFC section operate in the L6585DE?
The PFC section operates in transition mode, using a high-performance error amplifier and a precise internal voltage reference to achieve high power factor correction and low THD.
- What is the precision of the half-bridge oscillator in the L6585DE?
The half-bridge oscillator has a precision of ±3%.
- What is the dead time of the half-bridge section in the L6585DE?
The dead time of the half-bridge section is 1.2 µs.
- How does the end-of-life protection work in the L6585DE?
The end-of-life protection is programmable and compliant with both lamp-to-ground and capacitor-to-ground configurations.
- What are the current capabilities of the PFC and half-bridge gate drivers?
The PFC gate driver can source up to 300 mA and sink up to 600 mA, while the half-bridge drivers can source up to 290 mA and sink up to 480 mA.
- What is the purpose of the ZCD input in the PFC section?
The ZCD input is used to turn on the MOSFET when the choke current reaches zero, helping to achieve power factor correction and THD reduction.
- What are the typical applications of the L6585DE?
The L6585DE is typically used in fluorescent lighting systems, high-intensity discharge (HID) lighting systems, and other applications requiring high power factor correction.
- How does the L6585DE ensure high current capability and protection?
The IC ensures high current capability through its high-performance drivers and protects against over-current, hard switching events, and other faults through its integrated protection mechanisms.
