Infineon Technologies CY8CLEDAC02

Overview

CY8CLEDAC02 from Cypress Semiconductor is an AC-DC controller IC for dimmable LED lighting, implementing primary-side quasi-resonant flyback control with intelligent wall dimmer detection (leading/trailing edge and no-dimmer modes), 2–100% dimming range, ±2.5% LED current regulation, and integrated protection including OOVP, OSCP, OTP, CSSP, and PCLP. It targets offline LED replacement lamps and luminaires requiring UL-isolated, opto-coupler-free operation.

For engineers reviewing the CY8CLEDAC02 datasheet, CY8CLEDAC02 pinout, CY8CLEDAC02 application, or CY8CLEDAC02 equivalent, key selection criteria include dimmer compatibility (R/RL/RC/RLC), primary-side sensing architecture, valley-switching timing, VT-pin NTC-based thermal compensation, and cycle-by-cycle adaptive digital regulation without external loop compensation.

Technical Context

The CY8CLEDAC02 employs proprietary digital control to auto-detect dimmer type during the first four AC half-cycles using BOOST-pin resistive loading and VIN slope analysis. It switches between linear dimming (≥20% load) and 900 Hz PWM dimming (<20% load) to eliminate visible flicker.

Its quasi-resonant valley-switching mode-triggered when VSENSE falls below 0.128 V-minimizes switching loss and EMI. Regulation uses primary-side sensing via VSENSE (bias winding feedback) and ISENSE (peak-current control), eliminating secondary-side optocouplers while maintaining ±2.5% LED current accuracy across line and load.

Key Specifications

Pinout & Package

Package: 8-pin SOIC with exposed thermal pad (GND-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC-DC LED driver applications.

Compared with NCL30001 and ICE2QS03G, CY8CLEDAC02 uniquely integrates digital dimmer detection, adaptive PWM/linear dimming, and primary-side thermal compensation-enabling single-chip, opto-free, flicker-free dimming solutions without external signal conditioning or microcontroller coordination.

Availability

CY8CLEDAC02 is available at Aetrix Electronics and suitable for dimmable LED replacement lamps, commercial luminaires, architectural wall washers, and hotel vanity lighting requiring stable component supply and long-lifecycle support.

Supply support for CY8CLEDAC02 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

Cypress Semiconductor (now part of Infineon Technologies) designs programmable system-on-chip solutions for embedded control, connectivity, and power management applications.

The CY8CLEDAC02 belongs to Cypress's LED lighting controller product line, engineered specifically for cost-sensitive, safety-certified, dimmable offline LED drivers that eliminate optocouplers and simplify EMI-compliant flyback design.

FAQ

What dimmer types does CY8CLEDAC02 support without external components?

CY8CLEDAC02 natively supports leading-edge (R, RL), trailing-edge (RC, RLC), and no-dimmer configurations through on-chip digital detection during startup. No external triac trigger circuits, optocouplers, or dimmer identification resistors are required-the BOOST pin provides resistive loading, and VIN slope analysis determines dimmer type within four AC half-cycles.

How does CY8CLEDAC02 achieve opto-coupler–free isolation compliance?

CY8CLEDAC02 uses primary-side regulation via VSENSE (bias winding feedback) and cycle-by-cycle ISENSE current limiting to maintain ±2.5% LED current accuracy without secondary feedback. This architecture meets UL 1310 Class II isolation requirements because no galvanic path exists between primary and secondary sides-eliminating optocouplers while preserving safety certification and simplifying transformer design.

What is the role of the VT pin beyond overtemperature protection?

The VT pin serves dual functions: it monitors an external NTC thermistor for overtemperature shutdown (triggering at <0.1 V), and it enables automatic LED brightness compensation. As temperature rises, NTC resistance drops, lowering VT voltage; the controller linearly reduces LED current from 100% at 0.5 V to 10% at 0.3 V-maintaining consistent lumen output without firmware or external DAC.

Does CY8CLEDAC02 require external loop compensation components?

No. CY8CLEDAC02 implements fully integrated digital loop compensation within its adaptive control algorithm. The cycle-by-cycle regulation uses internal gain and phase margin tuning-guaranteeing stability across line, load, and temperature without external RC networks, op-amps, or compensation capacitors-reducing BOM count and layout sensitivity.