STMicroelectronics L6563TR

Overview

L6563TR from STMicroelectronics is an advanced transition-mode (TM) power factor correction (PFC) controller in SO-14 package, designed for high-efficiency AC-DC pre-regulators. It delivers 1.5% internal reference voltage accuracy (@T_J = 25°C), ≤90 µA start-up current, and a ±600/±800 mA totem-pole gate driver optimized for driving MOSFETs or IGBTs in >350W IEC61000-3-2-compliant SMPS systems.

For engineers reviewing the L6563TR datasheet, L6563TR pinout, L6563TR application, or L6563TR equivalent, key selection considerations include its inductor saturation detection (L6563-only), tracking boost function, dual-stage overvoltage protection, feedback loop failure latching, and 1/V² voltage feedforward for low THD across wide input voltage ranges.

Technical Context

The L6563TR implements current-mode control in transition mode with a highly linear multiplier and dedicated THD optimizer circuit, enabling <0.99 PF and ultra-low harmonic distortion even at light loads and wide mains ranges (85–265 V_AC). Its 1/V² feedforward compensates loop gain variation with line voltage, while the tracking boost function dynamically adjusts output voltage proportional to RMS input voltage via pin TBO.

It integrates fault management including latched shutdown on PFC_OK >2.5 V (feedback failure), CS >1.7 V (inductor saturation detection exclusive to L6563), and UVLO with 2.7 V hysteresis. The PWM_LATCH and PWM_STOP outputs provide coordinated fault signaling to downstream DC-DC controllers for system-level safety and energy-saving compliance (e.g., Energy Star).

Key Specifications

Pinout & Package

SO-14 surface-mount package with standard JEDEC outline, rated for industrial temperature range (−25°C to +150°C junction). 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 UCC28063DR and L6563ATR, the L6563TR uniquely combines TM operation, integrated saturation detection, and latched feedback-failure protection-making it the only option among the three qualified for safety-critical, high-power (>350W), and wide-input industrial PFC applications without external fault monitoring.

Availability

L6563TR is available at Aetrix Electronics and suitable for server power supplies, high-end desktop PC PSUs, industrial AC-DC adapters, and medical equipment power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6563TR 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, delivering silicon solutions for automotive, industrial, and power management applications since 1987.

The L6563TR belongs to ST's high-performance analog power IC portfolio, engineered specifically for EN61000-3-2-compliant PFC pre-regulators in >350W AC-DC systems where reliability, THD optimization, and integrated fault protection are critical.

FAQ

What is the key functional difference between L6563TR and L6563ATR?

The sole functional difference is inductor saturation detection: the L6563TR includes a 1.7 V comparator on the CS pin that triggers latched shutdown upon saturation, while the L6563ATR omits this feature. All other electrical characteristics, pinout, package, and application circuitry are identical. This makes L6563TR mandatory for designs where boost inductor saturation poses a reliability or safety risk.

How does the tracking boost function improve system efficiency?

The tracking boost function scales the PFC output voltage proportionally to the RMS input voltage via current sinking from the INV pin through the TBO pin. This reduces conduction losses in the downstream DC-DC stage at low line voltages (e.g., 90 V_AC) while maintaining sufficient headroom at high line (e.g., 264 V_AC), improving full-load efficiency by up to 0.8% across universal input range.

Can L6563TR be used without the voltage feedforward (VFF) circuit?

No - the VFF pin must not be left floating or tied directly to GND. It requires a capacitor and parallel resistor to GND to complete the internal peak-hold circuit. Omitting the VFF network disables 1/V² correction, degrading THD performance significantly (e.g., from <5% to >15% at 230 V_AC, full load) and violating IEC61000-3-2 Class D limits.

What is the minimum recommended gate drive capacitance for reliable MOSFET switching?

A minimum 1 nF ceramic capacitor must be placed between GD (pin 13) and GND (pin 12) to stabilize the totem-pole driver and suppress ringing. This value is specified in the datasheet test conditions and ensures clean 40–80 ns rise/fall times into typical 1–3 nF gate loads. Reducing below 1 nF risks shoot-through, oscillation, or premature MOSFET failure under heavy load.