Original Electronic Components IC Chip L6562D L6562adtr

Product Overview of L6562D / L6562ADTR Transition-Mode PFC Controller IC

The L6562D and L6562ADTR are transition-mode (TM) power factor correction (PFC) controller ICs manufactured by STMicroelectronics. They are designed for the front-end PFC stage of AC-DC switch-mode power supplies that must comply with EN61000-3-2 harmonic current emission limits. The devices operate in transition mode, where the power MOSFET is turned on at the zero crossing of the boost inductor current, reducing turn-on switching losses and allowing the use of a standard recovery boost diode. A high-linearity multiplier processes the rectified AC line voltage to shape the inductor current waveform, reducing total harmonic distortion (THD) and bringing the power factor close to unity. The L6562ADTR is an enhanced version of the L6562D with optimized electrical characteristics and is pin-to-pin compatible, enabling direct replacement on existing PCB layouts without redesign. Both devices are supplied in an 8-pin small-outline package (SOP8 / SOIC-8) and are RoHS lead-free compliant.

Technical Specifications of L6562D / L6562ADTR Transition-Mode PFC Controller IC

Key Features and Design Benefits of L6562D / L6562ADTR

Transition-Mode Control for Reduced Switching Losses

Operating in transition mode, the controller initiates each switching cycle when the boost inductor current reaches zero. This zero-current switching (ZCS) turn-on reduces switching losses in the power MOSFET and allows the use of a standard recovery boost diode rather than a more expensive silicon carbide or ultrafast recovery device.

High-Linearity Multiplier for Low Input Current Distortion

The integrated multiplier receives the rectified AC line voltage signal and shapes the inductor current reference to follow the sinusoidal line waveform. This reduces THD in the input current and helps the power supply achieve a power factor near unity, supporting compliance with EN61000-3-2 for equipment with input power above 75W.

Integrated Totem-Pole Gate Driver Eliminates External Driver IC

The totem-pole output stage provides 600mA source and 800mA sink current, capable of directly driving medium-to-high-current power MOSFETs without an external gate driver. This reduces the number of components on the primary side and simplifies the BOM for AC-DC converter designs in the 75W to 300W range.

Two-Stage Overvoltage Protection and Remote Disable Function

The device includes a two-step overvoltage protection (OVP) circuit that responds to output overvoltage conditions by first reducing power delivery and then latching off if the condition persists. A remote disable (enable) function allows the controller to enter a low-power standby state, supporting standby power management in systems that must meet Energy Star or equivalent efficiency regulations.

Low Startup Current for Simplified Auxiliary Supply Design

With a maximum startup current of 60μA, the L6562D and L6562ADTR can be started from the high-voltage rectified rail through a resistor, reducing the complexity and conduction loss of the startup circuit. The operating quiescent current is below 5mA, contributing to overall no-load power consumption targets.

Applications of L6562D / L6562ADTR Transition-Mode PFC Controller IC

LCD and LED Television and Monitor Power Supplies

The PFC controller is used in the front-end PFC pre-regulator stage of LCD and LED television and monitor power supplies, where it boosts the rectified AC line to a regulated DC bus and shapes the input current to meet harmonic emission standards required for consumer electronics.

AC-DC Power Adapters and Industrial Battery Chargers

For laptop adapters, industrial battery chargers, and desktop power supplies rated above 75W, the L6562D and L6562ADTR provide the PFC function required for regulatory compliance in multiple markets. The SOP8 package supports compact adapter and charger form factors.

Industrial Open-Frame Switching Power Supplies

The devices are suitable for medium-power industrial open-frame power supplies and automation equipment power modules, where the -40°C to +125°C junction temperature range and integrated protection functions support continuous operation in factory environments with fluctuating line conditions.

FAQ About L6562D / L6562ADTR

Are the L6562D and L6562ADTR pin-to-pin compatible?

Yes. The L6562ADTR is an enhanced version of the L6562D with optimized electrical characteristics and is fully pin-to-pin compatible, allowing substitution on existing PCB layouts without layout modification.

What output power range are these devices typically used for?

The L6562D and L6562ADTR are typically used in transition-mode PFC stages for switching power supplies in the 75W to 300W range, where active PFC is required by EN61000-3-2 and similar regional harmonic standards.

Does the L6562D / L6562ADTR require an external gate driver?

No. The integrated totem-pole gate driver provides 600mA source and 800mA sink current, sufficient to directly drive most medium-power boost MOSFETs used in the target power range.

What is the difference between L6562D and L6562ADTR packaging?

The L6562D is supplied in tube packaging, suitable for low-to-medium volume assembly, while the L6562ADTR is supplied in tape-and-reel packaging for automated high-volume SMT production lines. Both devices share the same SOP8 (SOIC-8) package footprint and pinout.