Renesas IW3677-00C

Overview

The iW3677-00C from Renesas Electronics is a single-stage, primary-side AC/DC PWM controller with integrated PFC for LED lighting drivers up to 100W. It supports flyback and buck-boost topologies, delivers CV/CC regulation with <±3% line/load CV accuracy and <±5% CC accuracy, achieves PF > 0.9 and THD < 20% at ≥50% load, and operates across universal AC input (90–305VAC) in SOIC-7.

For engineers reviewing the iW3677-00C datasheet, iW3677-00C pinout, iW3677-00C application, or iW3677-00C equivalent, this controller is selected for high-power-factor, low-THD, noise-free LED driver designs requiring fast startup (<0.25s), <150mW standby loss, and comprehensive protection without secondary-side feedback.

Technical Context

The iW3677-00C implements digital control using PrimAccurate™ technology to enable precise primary-side constant voltage and constant current regulation without external loop compensation. Its PF-Boost™ architecture ensures power factor correction across full AC line range while maintaining stability under varying load types-constant power (e.g., downstream DC/DC) and constant resistance (e.g., LED strips).

It integrates a 600V-rated HV startup circuit that eliminates auxiliary winding requirements, reduces BOM count, and enables sub-0.25s startup. Protection features include cycle-by-cycle current limiting, output over-voltage, short-circuit, AC over/under-voltage, CS-resistor short detection, and thermal shutdown-all implemented on-die with latch-off behavior.

Key Specifications

Pinout & Package

Package: SOIC-7 (7-lead small outline integrated circuit), surface-mount, RoHS-compliant, thermal resistance θ_JA = 100°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side AC/DC controller applications.

Compared with NCP1654 and ICE2PCS01, the iW3677-00C provides full single-chip primary-side CV/CC regulation with integrated HV startup, eliminating auxiliary windings, optocouplers, and external compensation-reducing system cost, size, and design effort for ≤100W LED drivers.

Availability

iW3677-00C is available at Aetrix Electronics and suitable for LED lighting drivers, commercial troffer systems, and dimmable light strip power supplies requiring stable component supply, long-term lifecycle support, and compliance with global energy standards.

Supply support for iW3677-00C 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The iW3677-00C belongs to Renesas' iWatt LED lighting controller product line, designed specifically for high-efficiency, high-power-factor, noise-free primary-side regulated LED drivers targeting commercial and residential lighting markets.

FAQ

What is the primary function of the iW3677-00C in an LED lighting system?

The iW3677-00C serves as a single-stage, primary-side AC/DC PWM controller with integrated PFC for LED drivers up to 100W. It regulates both constant voltage and constant current outputs without secondary-side feedback, using PrimAccurate™ digital control. The iW3677-00C directly senses output conditions through transformer reset and current sense signals, enabling compact, reliable, and cost-effective LED driver designs compliant with global efficiency standards.

Does the iW3677-00C support universal AC input voltage?

Yes, the iW3677-00C supports universal AC input from 90VAC to 305VAC. This wide input range allows the same iW3677-00C design to be deployed globally-in North America (120VAC), Europe (230VAC), and Asia (220–240VAC)-without hardware changes. Its VIN pin monitors rectified line voltage for accurate PFC and brown-out protection across the entire range.

How does the iW3677-00C achieve power factor correction without a separate PFC stage?

The iW3677-00C uses Renesas' patented PF-Boost™ technology to deliver active power factor correction within a single-stage flyback or buck-boost topology. By dynamically controlling switching frequency and duty cycle based on real-time line voltage and current sensing, it achieves PF > 0.9 and THD < 20% at ≥50% load across 90–305VAC-eliminating the need for a dedicated boost PFC stage and associated components.

What protections are built into the iW3677-00C?

The iW3677-00C integrates eight protection functions: output over-voltage (OVP), output short-circuit (SCP), AC over-voltage, AC under-voltage (brown-out), cycle-by-cycle peak current limit, current-sense-resistor short detection, over-temperature shutdown, and latch-off recovery. All protections are implemented on-die with automatic restart or latched-off behavior depending on fault type, ensuring robust field reliability without external supervision circuitry.

Is the iW3677-00C pin-compatible with earlier iW3677 variants?

Yes, the iW3677-00C is pin-compatible with other iW3677 variants in the SOIC-7 package, including the iW3677-001. The "-00C" suffix denotes optimization for single-stage or two-stage constant-voltage applications and supersedes the -001 version per Renesas' ordering information. No PCB layout changes are required when upgrading from iW3677-001 to iW3677-00C.