Diodes Incorporated AL1676-20BS7-13

Overview

AL1676-20BS7-13 from Diodes Incorporated is a universal AC-input (85–277 VAC), high-power-factor (PF >0.9), boundary-conduction-mode (BCM) Buck LED driver IC with integrated 500 V/2.0 A high-voltage MOSFET, ±3% constant current regulation, 170 µA operating current at 5 kHz, and SO-7 package. It delivers stable current for retrofit LED lamps and LED tubes without auxiliary winding.

For engineers reviewing the AL1676-20BS7-13 datasheet, AL1676-20BS7-13 pinout, AL1676-20BS7-13 application, or AL1676-20BS7-13 equivalent, key selection criteria include integrated 500 V MOSFET rating, thermal foldback at +150°C, ROVP-based open-circuit protection, and single-winding inductor compatibility for low-BOM LED drivers.

Technical Context

The AL1676-20BS7-13 implements constant-on-time (COT) control to achieve >0.9 power factor across universal AC input while operating in boundary conduction mode (BCM) for simplified EMI compliance. Its internal 500 V/2.0 A MOSFET eliminates external HV switch requirements.

Current regulation relies on closed-loop sensing via the CS pin with 0.400 V internal reference and 0.8 V clamp, enabling ±3% output current accuracy. Protection architecture includes cycle-by-cycle OCP triggered at 1 V on CS, UVLO (14.5 V startup / 8.5 V hold), and dual-stage thermal management: linear foldback above +150°C and latch-off shutdown at +170°C.

Key Specifications

Pinout & Package

AL1676-20BS7-13 is housed in a thermally enhanced SO-7 package (6.90 × 3.90 mm body, 1.27 mm pitch, 1.75 mm max height) with exposed pad for improved heat dissipation. Pin 6 is NC; all other pins are electrically active per functional block diagram and absolute maximum ratings.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-power-factor Buck LED driver applications.

Compared with AL1676-20AS7-13, the -20BS7-13 enables higher-output-voltage LED strings (up to ~200 V) and better surge resilience; versus -20CS7-13, it trades 100 V breakdown margin for tighter thermal performance and lower cost in standard commercial lighting.

Availability

AL1676-20BS7-13 is available at Aetrix Electronics and suitable for retrofit LED lamps, LED tube lighting, and high-voltage DC-DC LED drivers requiring stable component supply, RoHS-compliant packaging, and production-ready lead times.

Supply support for AL1676-20BS7-13 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and lighting applications.

The AL1676 product line delivers highly integrated, high-power-factor LED drivers targeting cost-sensitive, high-volume lighting applications-including retrofit lamps and LED tubes-with emphasis on minimal external components and regulatory compliance.

FAQ

What is the maximum output power supported by AL1676-20BS7-13?

The AL1676-20BS7-13 supports up to 10 W output power, determined by its integrated 500 V/2.0 A MOSFET, SO-7 thermal limits, and minimum 20 V output requirement. At 200 mA constant current, this corresponds to a maximum 50 V output; higher voltages reduce allowable current due to thermal constraints and t_OFF timing limits.

How does the ROVP pin enable output open-circuit protection?

The ROVP pin uses an internal 0.5 V reference to monitor output voltage via an external resistor divider. When the divided voltage exceeds 0.5 V-indicating LED string open-AL1676 triggers OVP after a calculated t_{OFF_OVP} delay, clamping output voltage and preventing capacitor overvoltage. This eliminates need for external Zener or optocoupler-based protection.

Can AL1676-20BS7-13 operate from DC input instead of AC?

Yes-AL1676-20BS7-13 accepts rectified DC input up to 392 V (peak of 277 VAC). Its universal input design supports both AC mains and high-voltage DC sources like PV arrays or offline DC rails, provided input ripple is filtered and V_CC startup circuitry is adapted for DC bias conditions.

What is the role of the NC pin (Pin 6) in layout and routing?

Pin 6 is a true no-connect terminal: unconnected at die level and electrically isolated. It must remain unconnected on PCB-no trace, copper pour, or thermal pad. Routing over or near this pin is acceptable, but solder mask should fully cover it to prevent accidental shorts or contamination-related leakage paths.