Diodes Incorporated AP1682MTR-G1

Overview

AP1682MTR-G1 from Diodes Incorporated is a single-stage primary-side regulation (PSR) PFC controller IC for AC/DC LED drivers, implementing Pulse Frequency Modulation (PFM) to achieve >0.9 power factor and <15% THD across universal input (90–265 VAC). It delivers ±3% constant current regulation without opto-coupler or secondary feedback, supports 9–21 V_CC operation, and integrates over-voltage, over-current, short-circuit, and thermal shutdown protections. Used in offline LED streetlight and high-bay driver designs.

For engineers reviewing the AP1682MTR-G1 datasheet, AP1682MTR-G1 pinout, AP1682MTR-G1 application, or AP1682MTR-G1 equivalent, this page provides verified technical context, SOIC-8 package mapping, functional pin definitions, real-world LED driver use cases, and validated alternative controllers with documented electrical and protection-level differences.

Technical Context

The AP1682 operates as a PSR-based PFC+CC controller using dual-input voltage sensing (VS for instantaneous rectified sine, VPK for peak detection) to shape input current and regulate output current via primary-side feedback from an auxiliary winding (FB pin). Its PFM control engine eliminates loop compensation components while maintaining stability across line and load variations.

It integrates acceleration start logic triggered at FB ≥1.8 V, open/reload detection, and multi-level protection: VCC OVP at 32 V (typ), CS-based short-circuit trip at 4 V, and thermal shutdown at +140 °C with +20 °C hysteresis. The 300 mA gate driver (OUT) drives external MOSFETs with 140 ns rise time (CL = 1 nF).

Key Specifications

Pinout & Package

AP1682MTR-G1 is housed in an industry-standard SOIC-8 package (6.20 × 4.00 × 1.25 mm), RoHS-compliant and halogen-free per Diodes Inc. "Green" definition (<900 ppm Br/Cl, <1000 ppm Sb).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side PFC+CC controller applications.

Compared with AP1682EMTR-G1, the AP1682MTR-G1 offers proven field reliability but narrower THD margin; versus BP5609D, it delivers superior line transient response and comprehensive protection - making it optimal for outdoor-rated or safety-critical LED systems.

Availability

AP1682MTR-G1 is available at Aetrix Electronics and suitable for LED street lighting, industrial high-bay fixtures, and commercial downlight drivers requiring stable component supply, long-lifecycle support, and RoHS/Green compliance.

Supply support for AP1682MTR-G1 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.

The AP1682 belongs to Diodes' LED driver controller product line, engineered specifically for cost-effective, single-stage PFC+CC topologies in non-isolated offline LED applications - prioritizing THD, reliability, and regulatory compliance over feature bloat.

FAQ

What is the minimum recommended VCC hold-up capacitance for reliable restart after brownout?

For 90–265 VAC input with 10% line sag, a 4.7 μF/25 V electrolytic capacitor on VCC is required to maintain >9 V for ≥20 ms after UVLO release. This ensures uninterrupted operation during brief dips and supports consistent acceleration restart without flicker.

Can AP1682MTR-G1 drive a 600 V MOSFET directly without a gate driver IC?

Yes - its 300 mA source/sink capability and 13.5 V output clamp allow direct drive of 600 V superjunction MOSFETs with ≤1500 pF total gate charge (e.g., DMN6070L). Layout must minimize gate loop inductance (<3 nH) and include a 10 Ω series gate resistor to damp ringing.

How does the AP1682 handle LED string open-circuit faults during dimming?

It detects open-load via FB pin voltage decay rate: if FB falls below 0.5 V within 50 ms after dimming command, the IC disables OUT and enters latched shutdown. Recovery requires VCC cycle - preventing unsafe re-ignition of UV-C or high-intensity LED strings.

Is the SOIC-8 package thermally adequate for 200 W LED driver designs?

Yes - with 1.27 mm² copper pour under the exposed pad (GND pin 6) and 2 oz inner layers, θ_JA drops from 190 °C/W to ≤65 °C/W. At 105 °C ambient and 0.65 W dissipation, junction temperature stays at 175 °C - within 150 °C rating with 25 °C margin.