Diodes Incorporated AP1682EMTR-G1

Overview

AP1682EMTR-G1 from Diodes Incorporated is a single-stage primary-side regulation (PSR) PFC controller for AC/DC LED drivers, implementing Pulse Frequency Modulation (PFM) to achieve >0.9 power factor and <15% THD across universal input (85–265 VAC). It delivers ±3% constant current regulation without opto-coupler or secondary CV/CC circuitry and operates with 8 V minimum supply voltage and 20 µA start-up current. Used in cost-sensitive, high-efficiency LED lighting power supplies compliant with IEC61000-3-2.

For engineers reviewing the AP1682EMTR-G1 datasheet, AP1682EMTR-G1 pinout, AP1682EMTR-G1 application, or AP1682EMTR-G1 equivalent, key selection criteria include PSR-based CC accuracy, elimination of loop compensation, integrated OVP/SCP/OCP protection, and SO-8 thermal performance under 105°C ambient operation.

Technical Context

The AP1682EMTR-G1 implements input voltage sensing via dual pins (VS and VPK) to reconstruct instantaneous and peak rectified sine waveforms for real-time input-current shaping and harmonic suppression. Its PFM control engine dynamically adjusts switching frequency to maintain tight output current regulation while meeting IEC61000-3-2 Class C limits.

It integrates acceleration start logic triggered by FB voltage crossing 1.8 V, open/reload detection, and temperature-dependent shutdown at +140°C with +20°C hysteresis. The gate driver delivers 300 mA sink/source capability with 100 ns rise and 30 ns fall times into 1 nF load, enabling fast MOSFET switching in flyback-derived topologies.

Key Specifications

Pinout & Package

AP1682EMTR-G1 is housed in a standard SO-8 package (5.8 × 4.9 mm body, 1.27 mm pitch), optimized for thermal dissipation in enclosed LED driver housings with θJA = 190°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL1665 and BP5609D, AP1682EMTR-G1 uniquely balances high PF (>0.9), PFM-based efficiency across load range, and SO-8 thermal scalability-making it optimal for thermally demanding, standards-compliant LED drivers where external MOSFET selection and layout control are prioritized.

Availability

AP1682EMTR-G1 is available at Aetrix Electronics and suitable for LED street lighting, commercial downlights, industrial high-bay fixtures, and smart panel lights requiring stable component supply and RoHS 3/Green compliance.

Supply support for AP1682EMTR-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The AP1682E belongs to Diodes' LED driver controller product line, engineered specifically for cost-effective, high-reliability, single-stage PSR PFC solutions targeting Class C harmonic compliance in universal-input LED lighting.

FAQ

What is the minimum VCC voltage required for AP1682EMTR-G1 to operate continuously?

The AP1682EMTR-G1 maintains stable operation down to 7.5 V VCC (typical 8 V), as specified in the Recommended Operating Conditions table. Below this threshold, UVLO triggers shutdown. Startup requires ≥18 V on VCC, and the device enters latched-off state if VCC drops below 7.5 V during operation unless externally reset.

How does the AP1682EMTR-G1 achieve power factor correction without a secondary feedback loop?

It uses primary-side regulation via dual-input sensing: VS monitors instantaneous rectified line voltage, and VPK captures its peak value. Combined with auxiliary winding feedback (FB) and primary current sensing (CS), the internal PFM engine shapes input current to match the voltage waveform-achieving >0.9 PF without opto-coupler or secondary circuitry.

Can AP1682EMTR-G1 drive a 650 V MOSFET directly?

Yes-the OUT pin provides 300 mA sink/source drive strength and clamps at 13.5 V (typical), making it compatible with standard 650 V Si MOSFETs. Gate resistor selection must ensure dV/dt control and avoid shoot-through; typical Rg values range from 10 Ω to 47 Ω depending on MOSFET Qg and switching frequency.

What protection mechanisms activate during an LED string open-circuit condition?

Upon open-load detection, the AP1682EMTR-G1 disables switching, holds FB voltage at ~1.4 V, and enters low-power standby mode (ICC < 100 µA). It automatically resumes normal operation within 500 ms after LED string reconnection-no external reset or latch circuit required.