STMicroelectronics L6564H

Overview

L6564H from STMicroelectronics is a high-voltage startup transition-mode (TM) power factor correction (PFC) controller IC designed for the master-stage PFC pre-regulator in AC-DC systems. It integrates a 700 V startup source, bi-directional 1/V² voltage feedforward, ±1% internal reference (at T_J = 25 °C), 600/–800 mA totem-pole gate driver, and comprehensive protection including OVP, brownout detection, and inductor saturation sensing. It targets >400 W IEC61000-3-2/ JEITA-MITI-compliant SMPS for LED luminaires and high-end adapters.

For engineers reviewing the L6564H datasheet, L6564H pinout, L6564H application, or L6564H equivalent, key selection considerations include its 700 V HVS pin capability, 1/V² feedforward architecture for line transient immunity, latch-off protection against feedback loop disconnection, THD-optimized multiplier design, and SO-14 package compatibility with high-voltage mains interface layouts.

Technical Context

The L6564H implements current-mode control in transition mode using zero-current detection (ZCD) on pin 11 to trigger MOSFET turn-on, with leading-edge blanking (100–250 ns) on the CS comparator input. Its proprietary 1/V² feedforward circuit derives RMS line voltage via a peak-hold network on VFF (pin 5), enabling stable gain compensation across 85–265 V_AC inputs and fast response to both line sags and surges.

Protection logic is tightly integrated: OVP triggers at 2.5 V on PFC_OK (pin 6) with hysteresis (2.4 V restart); feedback failure latches off the IC when INV < 1.66 V *and* PFC_OK > 2.5 V; inductor saturation is detected via 1.7 V threshold on CS (pin 4); and brownout is sensed via dedicated mains drop detector referenced to 0.7 V and 1.4 V thresholds.

Key Specifications

Pinout & Package

Package: SO-14 (Small Outline, 14-pin, 3.9 mm body width, 1.27 mm pitch), RoHS-compliant, rated for industrial temperature range (–40 °C to +150 °C junction).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28051DR and FAN6961MX, the L6564H delivers superior line transient immunity via true bi-directional 1/V² correction, guaranteed latch-off on feedback failure for safety-critical systems, and higher HVS voltage margin enabling simpler front-end design - making it optimal for >400 W, standards-compliant, high-reliability PFC stages.

Availability

L6564H is available at Aetrix Electronics and suitable for LED lighting drivers, industrial AC-DC power supplies, and high-end adapter/charger designs requiring stable component supply, long-term lifecycle support, and compliance with EN61000-3-2 and JEITA-MITI standards.

Supply support for L6564H 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 analog devices for industrial, automotive, and consumer markets.

The L6564H belongs to ST's high-voltage analog power IC portfolio, engineered specifically for energy-efficient, standards-compliant PFC pre-regulators in high-power AC-DC conversion systems.

FAQ

What is the purpose of the HVS pin on the L6564H?

The HVS (High Voltage Startup) pin is a 700 V-rated terminal that connects directly to the rectified mains voltage. It houses an internal current source that charges the VCC capacitor during power-up, eliminating the need for an external high-voltage start-up resistor. This reduces no-load power loss and simplifies front-end design while maintaining safe operation under surge conditions.

How does the L6564H achieve bi-directional 1/V² feedforward?

The L6564H uses a proprietary peak-hold circuit on the VFF pin (pin 5) fed by a resistor divider from the MULT pin (pin 3). The resulting DC voltage equals the peak AC line voltage, enabling real-time scaling of the multiplier gain inversely with V². This architecture corrects for both line sags and surges - unlike conventional feedforward - improving transient response time by more than 3×.

What triggers the latched shutdown protection?

Latched shutdown activates when two simultaneous conditions occur: (1) the voltage on the PFC_OK pin exceeds 2.5 V (indicating overvoltage), and (2) the voltage on the INV pin falls below 1.66 V (indicating feedback loop disconnection or divider failure). Once latched, the IC remains off until VCC is cycled below 6 V - ensuring fail-safe behavior in safety-critical applications.

Can the L6564H drive an IGBT directly?

Yes - the totem-pole gate driver (pin 13) delivers +600 mA source and –800 mA sink current with a 12 V output clamp, sufficient to drive medium-speed IGBTs with gate charge ≤40 nC at 70 kHz. Layout must minimize GD-to-GND loop inductance, and a series gate resistor (5–10 Ω) is recommended to damp ringing and limit dV/dt during turn-on.