STMicroelectronics L6562ATD

Overview

L6562ATD from STMicroelectronics is a transition-mode (TM) power factor correction (PFC) controller in SO-8 package, designed for high-efficiency AC-DC pre-regulators. It delivers 1% internal reference voltage accuracy (@T_J = 25 °C), ultra-low 30 µA start-up current, and integrated totem-pole gate driver with ±600/±800 mA sourcing/sinking capability. Used in IEC61000-3-2-compliant flat-panel TV and street lighting PFC stages.

For engineers reviewing the L6562ATD datasheet, L6562ATD pinout, L6562ATD application, or L6562ATD equivalent, key selection considerations include its proprietary THD-optimized multiplier, digital leading-edge blanking on CS pin, disable function via INV pin, and dual-stage overvoltage protection (static + dynamic) enabling robust 400 V output regulation in outdoor-rated lighting systems.

Technical Context

The L6562ATD implements current-mode control in transition mode using zero-current detection (ZCD pin) to trigger MOSFET turn-on at inductor demagnetization. Its multiplier accepts rectified mains voltage (via MULT pin) and error amplifier output (COMP) to generate a sinusoidal current reference, minimizing THD across wide input voltage ranges.

It integrates a voltage-mode error amplifier with 1% accurate 2.5 V reference, programmable overvoltage protection triggered by COMP current ≥27 µA (dynamic) or EA saturation (static), and a disable function activated when INV voltage drops below 200 mV - enabling remote ON/OFF control compliant with EnergyStar and Blue Angel standards.

Key Specifications

Pinout & Package

SO-8 surface-mount package with standard 1.27 mm pitch; thermally enhanced layout supports 0.65 W power dissipation at T_A = 50 °C (R_thJA = 150 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transition-mode PFC controller applications.

Compared with L6562D, the L6562ATD offers lower OVP sensitivity and built-in blanking for improved noise immunity; versus UCC28051D, it provides true transition-mode operation with simpler magnetics but lacks CCM efficiency at high power - making it optimal for cost-sensitive 80–350 W outdoor-rated PFC stages.

Availability

L6562ATD is available at Aetrix Electronics and suitable for street lighting systems, flat-panel TV power supplies, and electronic ballasts requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for L6562ATD 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, specializing in power management, analog, and automotive ICs with vertical manufacturing and broad industrial qualification.

The L6562ATD belongs to ST's high-reliability PFC controller product line, engineered specifically for energy-efficient, IEC61000-3-2-compliant AC-DC conversion in outdoor and industrial environments.

FAQ

What is the purpose of the ZCD pin in the L6562ATD?

The ZCD (Zero-Current Detection) pin senses boost inductor demagnetization to precisely time MOSFET turn-on in transition mode. It accepts either an auxiliary winding signal or a drain-coupled R-C network, eliminating need for extra transformer windings. Its 0.7 V negative-going trigger threshold ensures reliable zero-current crossing detection across temperature and load conditions.

How does the L6562ATD achieve low THD in universal-input applications?

The L6562ATD uses a proprietary multiplier with adaptive offset near AC zero-crossings to extend MOSFET conduction during low-line-voltage intervals. This actively discharges the bridge rectifier's high-frequency filter capacitor, reducing conduction dead-angle and achieving <10% THD across 85–264 V_AC without external THD compensation circuits.

Can the L6562ATD operate without an auxiliary winding on the boost inductor?

Yes - the ZCD pin supports direct connection to the MOSFET drain via a 330 kΩ resistor and 22 pF capacitor. This R-C network transfers drain voltage edges to the ZCD comparator, arming and triggering it reliably. ST validates this configuration for 400 V output designs with peak input voltage margins up to 10 V.

What happens during overvoltage protection activation?

Dynamic OVP activates when COMP pin current exceeds 27 µA (e.g., due to sudden load removal), forcing GD low and halting switching. Static OVP engages if EA saturates at light load, inducing burst-mode operation. Both reduce quiescent current to 1.7 mA to preserve V_CC hold-up time until fault clears and restart thresholds are met.