STMicroelectronics L6562D

Overview

L6562D from STMicroelectronics is a transition-mode (TM) power factor correction (PFC) controller IC in SO-8 package, featuring 1% internal reference voltage (2.5 V), ultra-low 70 µA start-up current, and a ±600/±800 mA totem-pole gate driver with 12 V output clamp. It implements proprietary THD-optimized multiplier architecture for IEC61000-3-2 compliance in 85–265 VAC SMPS up to 300 W.

For engineers reviewing the L6562D datasheet, L6562D pinout, L6562D application, or L6562D equivalent, key selection criteria include its TM PFC control topology, OVP trigger current (40 µA dynamic / 2.25 V static), ZCD demagnetization sensing capability, and compatibility with wide-range mains input and high-efficiency boost pre-regulators.

Technical Context

The L6562D uses a current-mode transition-mode control architecture with zero-current detection (ZCD) to synchronize MOSFET turn-on at inductor demagnetization, minimizing switching loss and EMI. Its highly linear multiplier accepts rectified mains voltage (via pin MULT) and error amplifier output (pin COMP) to generate a sinusoidal current reference.

It integrates dual-stage overvoltage protection: dynamic OVP triggered by ≥40 µA current into the error amplifier output (pin COMP), and static OVP activated when the error amplifier saturates low under light-load conditions. The 1% precision 2.5 V reference (Tj = 25 °C) enables accurate output voltage regulation independent of divider resistor tolerances.

Key Specifications

Pinout & Package

SO-8 package (ECOPACK® compliant, lead-free second-level interconnect); 1.27 mm pitch, 5.0 × 4.0 mm body, 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with L6562N, the L6562D offers superior thermal performance in SMT volume production; versus ICE2PCS01, it delivers measurable THD reduction and more robust overvoltage handling essential for 250–300 W IEC61000-3-2-compliant designs.

Availability

L6562D is available at Aetrix Electronics and suitable for desktop PC power supplies, hi-end AC-DC adapters, and entry-level web server PSUs requiring stable component supply, long-term lifecycle support, and ECOPACK®-compliant packaging.

Supply support for L6562D 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 analog, microcontroller, power, and automotive ICs with emphasis on energy efficiency and industrial reliability.

The L6562D belongs to ST's legacy PFC controller product line, engineered specifically for cost-sensitive, high-efficiency transition-mode boost pre-regulators targeting IEC61000-3-2 Class D compliance in consumer and computing power supplies.

FAQ

What is the purpose of the ZCD pin on the L6562D?

The ZCD (Zero-Current Detection) pin senses the voltage across the boost inductor's auxiliary winding to detect demagnetization completion. A negative-going edge on this pin triggers MOSFET turn-on, ensuring zero-current switching in transition-mode operation-critical for high efficiency, low EMI, and accurate frequency control across input voltage and load ranges.

How does the L6562D achieve low THD in AC input current?

The L6562D integrates a proprietary THD optimizer circuit that adds a controlled positive offset to the multiplier output near AC line voltage zero-crossings. This forces earlier and longer MOSFET conduction during low-voltage intervals, minimizing conduction dead-angle and fully discharging the bridge rectifier's high-frequency filter capacitor-reducing measured THD to 3.6% at 85 VAC full load per official evaluation data.

Can the L6562D be used in continuous conduction mode (CCM)?

No-the L6562D is exclusively designed for transition-mode (TM) operation and lacks the internal circuitry for CCM control, such as ramp compensation or fixed-frequency PWM generation. Its ZCD pin, variable-frequency oscillator, and current-sense comparator architecture are optimized for boundary-conduction-mode timing and cannot be configured for CCM without external modifications that void specification compliance.

What is the function of the disable feature on the L6562D?

The disable function is implemented via the ZCD pin: applying ≥250 mV to ZCD forces the IC into idle state, disabling gate drive and reducing quiescent current to 2.2 mA. This enables remote ON/OFF control for energy-saving modes (e.g., standby), simplifies system-level power sequencing, and supports compliance with Blue Angel and EnergyStar low-power requirements without external logic.