STMicroelectronics HVLED805

Overview

HVLED805 from STMicroelectronics is an off-line LED driver IC integrating an 800 V avalanche-rugged power MOSFET and a current-mode PWM controller for quasi-resonant flyback topology. It delivers ±5% constant LED output current via primary-sensing feedback, eliminates optocoupler and secondary-side sensing, and supports both constant-current (CC) and constant-voltage (CV) regulation with open/short LED string protection. Used in E27/GU10 LED retrofit lamps.

For engineers reviewing the HVLED805 datasheet, HVLED805 pinout, HVLED805 application, or HVLED805 equivalent, key selection criteria include primary-sensed CC accuracy, 800 V drain rating, QR ZVS operation, integrated HV startup, and CV/CC dual-mode fault management under LED open/short conditions.

Technical Context

The HVLED805 implements a current-mode quasi-resonant flyback controller with transformer demagnetization detection on the DMG pin to enable zero-voltage switching. Its internal 800 V MOSFET features 11 Ω R_DS(on) at 25 °C and 50 mJ single-pulse avalanche energy rating, enabling direct rectified-mains operation without external HV devices.

Primary-sensing CC regulation uses a voltage feed-forward path via DMG pin current monitoring to maintain mains-independent LED current accuracy. The device auto-selects among QR mode (heavy load), valley-skipping (medium/light load), and controlled burst-mode (no load), with maximum f_sw limited to 166 kHz and built-in hiccup-mode OCP with automatic restart.

Key Specifications

Pinout & Package

HVLED805 is housed in a SO16N package with exposed drain pads (pins 13–16) for enhanced thermal dissipation. The copper area beneath drain pins must be designed per ST's mechanical recommendations to maintain T_J ≤ 150 °C at 0.9 W P_tot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar off-line LED driver applications.

Compared with MP1601 and NCL30002, HVLED805 provides superior mains-independent CC accuracy, integrated HV startup, and adaptive multi-mode switching-enabling smaller magnetics, lower system cost, and higher reliability in space-constrained LED lamp designs.

Availability

HVLED805 is available at Aetrix Electronics and suitable for LED retrofit lamps, AC-DC LED drivers, and industrial LED lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HVLED805 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog chips, and discrete devices for industrial, automotive, and consumer markets.

HVLED805 belongs to ST's HVLED family of off-line LED driver ICs engineered specifically for cost-sensitive, high-reliability AC-powered LED lighting-emphasizing primary-sensing accuracy, integrated protection, and minimal external components.

FAQ

What is the purpose of the DMG pin in HVLED805?

The DMG pin serves three critical functions: detecting transformer demagnetization to enable quasi-resonant zero-voltage switching, sampling output voltage at the end of demagnetization for constant-voltage regulation, and monitoring input voltage via sourced current for mains-independent constant-current regulation. It features internal clamping (−60 mV to 3.3 V), blanking logic tied to COMP voltage, and strict ±2 mA current limits to ensure robust operation across line and load conditions.

Does HVLED805 require an auxiliary winding on the transformer?

Yes-an auxiliary winding is mandatory for HVLED805 to perform both constant-current and constant-voltage regulation. It supplies the IC via the VCC pin during normal operation and provides the voltage signal fed to the DMG pin for output voltage sampling and input voltage feed-forward. While the internal HV startup circuit powers the IC at initial turn-on, the auxiliary winding sustains operation and enables precise regulation; omitting it results in loss of CV/CC control and potential instability.

How does HVLED805 handle LED string open-circuit faults?

HVLED805 automatically transitions from constant-current (CC) to constant-voltage (CV) regulation when an LED string opens. The DMG pin detects the resulting rise in auxiliary winding voltage and triggers the internal transconductance error amplifier to regulate output voltage instead of current. This prevents overvoltage damage to downstream components and maintains safe operation until service intervention, with hiccup-mode OCP ensuring no thermal stress occurs during sustained open-circuit conditions.

Can HVLED805 operate without an optocoupler?

Yes-HVLED805 is explicitly designed for optocoupler-free operation. Its primary-sensing architecture uses the DMG pin to derive both output voltage and input line information, while the ILED pin and internal reference enable accurate constant-current regulation without secondary-side current sensing or voltage references. This eliminates optocoupler aging, gain drift, and CMTI limitations-reducing bill-of-materials cost and improving long-term reliability in LED lamp applications.