HVLED805

Overview

The HVLED805 is a high-voltage primary switcher designed for operating directly from rectified mains with minimal external components. It integrates a high-performance low-voltage PWM controller and an 800V avalanche-rugged power MOSFET in a single package. The device supports ZVS fly-back LED drivers with constant output current regulation via primary-sensing feedback, eliminating the need for opto-couplers or secondary-side sensing. It features quasi-resonant operation triggered by transformer demagnetization sensing, which also monitors output voltage for CV regulation and input voltage for line feed-forward CC regulation. Maximum switching frequency is limited below 166 kHz, with automatic frequency reduction at medium-light loads to maintain ZVS. At very light loads, controlled burst-mode operation minimizes residual input consumption.

Feature Summary

• Integrates 800V avalanche-rugged power MOSFET with low-voltage PWM controller
• Enables zero voltage switching (ZVS) fly-back topology
• Provides constant current regulation using primary-sensing feedback
• Supports constant voltage regulation for open-string fault safety

Applications

• Off-line LED driving applications up to 5W
• E26/E27/GU10 LED lamp designs
• Compact AC-DC LED power supplies

Procurement Notes

Verify part authenticity through authorized STMicroelectronics distributors or official channels. Confirm package type and marking codes match datasheet specifications. Check RoHS compliance status as indicated in official documentation. Ensure ordering suffixes align with required packaging options. Request batch-specific test reports if applicable for critical reliability requirements.

Selection Notes

Select HVLED805 for cost-effective, compact LED driver solutions requiring primary-side regulation. Suitable for applications where opto-coupler elimination reduces component count and improves reliability. Ideal for E26, E27, and GU10 form factor lamps. Consider thermal management due to integrated MOSFET design. Verify transformer design compatibility with primary-sensing feedback requirements.

Part Context

HVLED805 belongs to STMicroelectronics' HVLED series of off-line LED drivers. It complements other devices like HVLED815PF, which offers higher power capability and power factor correction. Unlike STM805 supervisors or STM8L microcontrollers, this component focuses exclusively on power conversion for LED illumination rather than system monitoring or control logic.

FAQ

Does the HVLED805 require an opto-coupler?

No, the HVLED805 uses primary-sensing feedback to regulate LED current, eliminating the need for an opto-coupler, secondary voltage reference, or secondary current sense.

How does the HVLED805 handle LED string faults?

It guarantees safe operation during short circuits of one or more LEDs and provides constant output voltage regulation to safely manage open-string failures caused by LED defects.