STMicroelectronics L6564DTR

Overview

L6564DTR from STMicroelectronics is a 10-pin transition-mode (TM) power factor correction (PFC) controller IC designed for high-efficiency AC-DC preregulators. It integrates a bidirectional 1/V² voltage feed-forward circuit, 1% internal reference (at T_J = 25 °C), 600 mA source / 800 mA sink totem-pole gate driver, and comprehensive protection including OVP, brownout detection, and inductor saturation sensing. It targets EN61000-3-2/IEC61000-3-2-compliant SMPS up to 400 W.

For engineers reviewing the L6564DTR datasheet, L6564DTR pinout, L6564DTR application, or L6564DTR equivalent, key selection criteria include its SSOP10 package footprint, 10.3–22.5 V operating V_CC, 1.7 V current-sense threshold, 0.8 V brownout disable level, and fixed-off-time control architecture optimized for low THD across wide input voltage ranges.

Technical Context

The L6564DTR implements a current-mode TM PFC control loop with a proprietary squarer-divider (1/V²) feed-forward path that dynamically adjusts loop gain based on rectified mains peak voltage (via MULT and VFF pins), enabling stable operation during both line surges and sags. Its multiplier output drives the PWM comparator through CS, with built-in leading-edge blanking (100–250 ns) and zero-current detection (ZCD) for precise MOSFET turn-on timing.

Protection logic is tightly integrated: feedback failure triggers latched shutdown when INV < 1.66 V while PFC_OK > 2.5 V; inductor saturation is detected via 1.7 V CS threshold with automatic restart delay (150–600 µs); and brownout is sensed at VFF < 0.8 V (non-latched). The error amplifier features 60–80 dB open-loop gain and 1 MHz GBW for robust voltage-loop compensation.

Key Specifications

Pinout & Package

Package: SSOP10 (3.9 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced for surface-mount assembly in compact PFC stages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICE3PCS01G and UCC28051DR, the L6564DTR delivers superior THD stability across universal input range due to its monolithic 1/V² circuit and integrated ZCD, while its 150 µA start-up current and latched feedback-failure protection reduce system-level validation effort in high-reliability applications.

Availability

L6564DTR is available at Aetrix Electronics and suitable for high-end AC-DC adapters, desktop/server PSUs, and IEC61000-3-2-compliant industrial SMPS requiring stable component supply across extended temperature and long product lifecycles.

Supply support for L6564DTR 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 microcontrollers, power ICs, sensors, and automotive-grade components with ISO 9001 and IATF 16949 certification.

The L6564DTR belongs to ST's high-performance Analog & Power IC product line, engineered specifically for energy-efficient, standards-compliant AC-DC conversion in consumer, computing, and industrial power supplies.

FAQ

What is the purpose of the VFF pin and how must it be configured?

The VFF pin implements the 1/V² voltage feed-forward function and AC brownout detection. It must be connected to GND via a resistor (100 kΩ to 2 MΩ) and capacitor (typically 1 µF) to form a peak-hold circuit. Direct grounding is prohibited-it disables feed-forward and prevents brownout protection. The internal comparator triggers shutdown at <0.8 V and restart at >0.88 V.

How does the L6564DTR protect against boost inductor saturation?

It monitors the CS pin voltage and triggers an internal safety procedure when it exceeds 1.7 V (typ). This halts switching, activates a restart timer (150–600 µs), and limits MOSFET stress. The protection is independent of the main current threshold and uses dedicated circuitry to distinguish saturation from normal peak current.

Can the L6564DTR be used in continuous conduction mode (CCM)?

No-the L6564DTR is exclusively designed for transition-mode (TM) operation. Its ZCD pin, fixed-off-time control architecture, and internal timing blocks are optimized for zero-current switching in boost PFC. CCM operation requires different controllers such as the ICE3PCS01G or L4981A.

What is the function of the PFC_OK pin beyond overvoltage protection?

It serves three roles: (1) OVP monitoring (shuts down at >2.5 V), (2) feedback failure detection (latched shutdown when INV < 1.66 V simultaneously), and (3) remote ON/OFF control (disable at <0.23 V, enable at >0.27 V). This enables coordinated sequencing with downstream DC-DC controllers.