STMicroelectronics L6563HTR

Overview

L6563HTR 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 confirmed parameters: 1% internal reference (T_J = 25 °C), ≤100 µA start-up current, 6 mA max. operating bias current, and SO-16 package. It enables EN61000-3-2–compliant >400 W SMPS for high-end adapters and LED luminaires.

For engineers reviewing the L6563HTR datasheet, L6563HTR pinout, L6563HTR application, or L6563HTR equivalent, this page delivers verified technical context, exact pin roles, real-world use cases in IEC61000-3-2–compliant systems, and validated alternative controllers with documented functional differences - all grounded in ST's production-grade documentation (DocID16047 Rev 4).

Technical Context

The L6563HTR implements current-mode control in transition mode using a highly linear multiplier with proprietary 1/V² feedforward that corrects gain variation across input voltage range - enabling fast line transient response during both mains surges and drops. Its internal error amplifier uses a 1% accurate 5 V reference and supports voltage-mode loop compensation via COMP–INV network.

It embeds dual protection coordination: PFC_OK monitors output voltage with latched shutdown on feedback failure (INV < 1.66 V + PFC_OK > 2.5 V), while CS detects inductor saturation at 1.7 V and triggers temporary stop. The HVS pin provides self-limiting 700 V start-up, and TBO enables proportional output voltage scaling with rectified mains via external resistor.

Key Specifications

Pinout & Package

Package: SO-16 (Small Outline, 16-pin, 150 mil width), RoHS-compliant, thermal resistance 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 UCC28051DR and L6563STR, the L6563HTR uniquely combines HV start-up, bidirectional 1/V² feedforward, and tracking boost in one SO-16 package - reducing component count, improving light-load efficiency, and simplifying compliance with stringent harmonic standards.

Availability

L6563HTR is available at Aetrix Electronics and suitable for high-end AC-DC adapters, IEC61000-3-2–compliant SMPS, and LED luminaire power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6563HTR 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, microcontrollers, and automotive ICs.

The L6563HTR belongs to ST's high-voltage analog PFC controller product line, engineered specifically for energy-efficient, standards-compliant AC-DC conversion in industrial and consumer power supplies up to 400 W.

FAQ

What is the purpose of the TBO pin on the L6563HTR?

The TBO (Tracking Boost Output) pin provides a buffered version of the VFF voltage. When an external resistor connects TBO to GND, it sinks a proportional current from the INV pin, dynamically adjusting the PFC output voltage to track the RMS mains voltage. This reduces conduction losses at low line inputs and improves light-load efficiency without requiring external DAC or microcontroller intervention.

How does the L6563HTR handle feedback loop failure?

The L6563HTR detects feedback loop failure when PFC_OK exceeds 2.5 V *and* INV falls below 1.66 V simultaneously. In this condition, it asserts PWM_LATCH high and enters latched shutdown. Recovery requires cycling VCC below 6 V to reset the UVLO latch - ensuring fail-safe operation and preventing uncontrolled overvoltage during open-loop faults.

Can the L6563HTR be used in continuous conduction mode (CCM)?

No - the L6563HTR is exclusively a transition-mode (TM) PFC controller. Its zero-current detection (ZCD) input, fixed-off-time architecture, and current-sense timing logic are optimized for boundary-conduction operation. For CCM designs, ST recommends the L4984D or UCC28070 families, which provide average-current-mode control and dedicated CCM gate drivers.

What is the maximum recommended operating junction temperature for the L6563HTR?

The absolute maximum junction temperature is 150 °C, but ST specifies reliable continuous operation up to 125 °C under typical thermal conditions. Derating is required above this point: R_thJA = 120 °C/W implies 0.75 W max power dissipation at T_A = 50 °C. Layout must ensure adequate copper area and thermal vias beneath the exposed pad (if used in SO-16 variant) to maintain safe thermal margin.