STMicroelectronics L6563H

Overview

L6563H from STMicroelectronics is a high-voltage start-up transition-mode (TM) PFC controller IC designed for the master-stage pre-regulator in AC-DC power supplies. It integrates a 700 V start-up source, bidirectional 1/V² voltage feedforward, tracking boost function, and a ±600/±800 mA totem-pole gate driver. Key parameters include 1% internal reference voltage (at T_J = 25 °C), ≤100 µA start-up current, and 6 mA max. operating bias current - enabling EN61000-3-2 and JEITA-MITI compliance in >400 W LED luminaires and high-end adapters.

For engineers reviewing the L6563H datasheet, L6563H pinout, L6563H application, or L6563H equivalent, this page delivers verified technical context on TM PFC control architecture, real-time line transient response via bidirectional feedforward, latch-off protection against feedback loop disconnection, and interoperability with cascaded PWM controllers such as L6599A in dual-stage SMPS designs.

Technical Context

The L6563H implements fixed-off-time current-mode control in transition mode, using a highly linear multiplier with integrated 1/V² correction to maintain near-sinusoidal input current across universal mains (85–265 V_AC). Its bidirectional feedforward responds to both line surges and drops within <10 µs, minimizing THD under dynamic load and line conditions.

It embeds a dedicated tracking boost block that sinks programmable current from the INV pin via TBO (Pin 6), enabling output voltage scaling proportional to RMS input voltage. Protection logic includes latched shutdown on feedback failure (PFC_OK > 2.5 V + INV < 1.66 V), inductor saturation detection at CS (1.7 V threshold), and HV start-up reactivation during UVLO or latch-off events.

Key Specifications

Pinout & Package

Package: SO-16 (SO16), surface-mount, 150 °C max. junction temperature, R_thJA = 120 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28051 and FAN6982, the L6563H uniquely integrates 700 V start-up, bidirectional 1/V² feedforward, and tracking boost - delivering superior THD across universal input, reduced component count, and enhanced system-level fault coordination without external circuitry.

Availability

L6563H is available at Aetrix Electronics and suitable for LED luminaires, high-end AC-DC adapters, and industrial SMPS requiring stable component supply, long-lifecycle support, and compliance with EN61000-3-2, JEITA-MITI, and ENERGY STAR standards.

Supply support for L6563H 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 microcontroller solutions for industrial, automotive, and consumer markets.

The L6563H belongs to ST's high-voltage analog power IC portfolio, engineered specifically for energy-efficient, standards-compliant PFC pre-regulators in >400 W AC-DC systems with stringent THD and reliability requirements.

FAQ

What is the purpose of the TBO pin (Pin 6) on the L6563H?

Pin 6 (TBO) provides a buffered version of the VFF voltage and sources a current proportional to the mains peak voltage. When connected to ground via a resistor, it sinks current from the INV pin (Pin 1), causing the PFC output voltage to scale linearly with input RMS voltage - enabling tracking boost operation that reduces no-load losses and improves light-load efficiency.

How does the L6563H handle feedback loop disconnection?

The L6563H detects feedback loop disconnection via concurrent conditions: PFC_OK voltage exceeding 2.5 V and INV voltage falling below 1.66 V. Upon detection, it asserts PWM_LATCH high, disables switching, and enters latched shutdown. Recovery requires cycling V_CC below 6 V and back above the turn-on threshold - preventing uncontrolled output voltage rise.

Can the L6563H be used without the high-voltage start-up feature?

Yes - the HVS pin (Pin 9) may be left unconnected if an external bias supply powers V_CC. In that configuration, the internal 700 V start-up generator remains inactive, and standard V_CC start-up behavior applies (10.5 V turn-on, 6 V UVLO). All other functions - including 1/V² feedforward, tracking boost, and protections - remain fully operational.

What is the maximum recommended operating temperature for the L6563H in SO-16 package?

The L6563H specifies a junction temperature operating range of −40 °C to +150 °C. In SO-16 package with typical PCB layout (2 cm² copper pour), thermal resistance is 120 °C/W. To maintain T_J ≤ 125 °C at 50 °C ambient, power dissipation must stay below 0.625 W - achievable given its 6 mA max. bias current and low quiescent consumption.