STMicroelectronics E-L6562D

Overview

E-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 UVLO pull-down and 12 V output clamp. It implements proprietary THD-optimized multiplier architecture for IEC61000-3-2 compliance in 85–265 VAC, 250 W SMPS designs such as desktop PC power supplies.

For engineers reviewing the E-L6562D datasheet, E-L6562D pinout, E-L6562D application, or E-L6562D equivalent, key selection criteria include its 10.3–22 V operating supply range, dynamic/static OVP thresholds (40 µA / 2.25 V), zero-current detection (ZCD) input with 1.6 V negative-edge trigger, and precise 2.5 V feedback reference tolerance (±0.035 V at 25 °C).

Technical Context

The L6562D uses current-mode control in transition mode, where MOSFET turn-on is triggered by zero-current detection on the boost inductor's demagnetization phase. Its highly linear multiplier accepts rectified mains voltage (via pin MULT) and error amplifier output (pin COMP) to generate a sinusoidal current reference, minimizing crossover distortion near line zero-crossings.

It integrates dual OVP protection: dynamic OVP responds to abrupt load-dropped overvoltage via COMP node current monitoring (37–40 µA threshold), while static OVP activates during low-load saturation of the error amplifier. The gate driver delivers 600 mA source / 800 mA sink with built-in 12 V clamp and UVLO-driven pull-down for safe MOSFET/IGBT switching.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant, lead-free second-level interconnect, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28019 and FAN6961, the E-L6562D uniquely combines ZCD-based TM operation, proprietary THD optimization, and dual-stage OVP in a single SO-8 package-making it the only choice for 250–300 W IEC61000-3-2-compliant designs demanding <4% THD across universal AC input.

Availability

E-L6562D is available at Aetrix Electronics and suitable for desktop PC power supplies, IEC61000-3-2 compliant AC-DC adapters, and entry-level server PSUs requiring stable component supply, long-term lifecycle support, and ECOPACK® environmental compliance.

Supply support for E-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 sensor solutions for industrial, automotive, and consumer markets.

The L6562 series belongs to ST's legacy PFC controller product line, engineered specifically for cost-effective, high-efficiency transition-mode power factor correction in sub-300 W AC-DC power supplies targeting international harmonic standards.

FAQ

What is the purpose of the ZCD pin (Pin 5) in the E-L6562D?

The ZCD (Zero-Current Detection) pin senses the demagnetization of the boost inductor via a resistor divider from the switch node. A negative-going edge on this pin triggers MOSFET turn-on, ensuring true transition-mode operation with minimal switching loss and precise timing control. Its 1.6 V trigger threshold and 150–250 mV disable threshold enable reliable startup and fault shutdown.

How does the E-L6562D achieve low THD in universal-input applications?

The E-L6562D uses a proprietary multiplier circuit that adds a controlled positive offset to the current reference near AC line zero-crossings. This forces earlier and longer MOSFET conduction during low-voltage intervals, fully discharging the bridge rectifier's high-frequency filter capacitor and eliminating conduction dead-angle-reducing THD to ≤3.6% at 85 VAC full load as measured on EVAL6562-250W.

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

No-the E-L6562D is exclusively designed for transition-mode (TM) operation using zero-current detection. It lacks the internal ramp generator, slope compensation, or fixed-frequency oscillator required for stable CCM control. Attempting CCM operation results in erratic switching, poor regulation, and potential overvoltage faults due to missing demagnetization sensing.

What is the significance of the 12 V clamp on the GD pin (Pin 7)?

The GD pin's 12 V output clamp prevents excessive gate voltage on external MOSFETs when VCC exceeds 12 V-common during transient surges or high-hold-up capacitor discharge. This protects gate oxide integrity and avoids shoot-through in half-bridge configurations. The clamp activates only during sourcing; sinking remains unclamped to ensure strong turn-off drive up to 800 mA.