Diodes Incorporated AL1676-30AS7-13

Overview

AL1676-30AS7-13 from Diodes Incorporated is a universal-input (85–277 VAC), high-power-factor Buck LED driver IC with integrated 300 V/3.0 A MOSFET in SO-7 package. It delivers ±3% constant current regulation in boundary conduction mode (BCM), supports retrofit LED lamps and LED tubes, and features thermal foldback, OVP/OSP, and cycle-by-cycle OCP for robust operation.

For engineers reviewing the AL1676-30AS7-13 datasheet, AL1676-30AS7-13 pinout, AL1676-30AS7-13 application, or AL1676-30AS7-13 equivalent, this device is selected for cost-sensitive, high-efficiency AC-DC LED drivers requiring minimal external components, tight CC tolerance, and regulatory-compliant EMI performance.

Technical Context

The AL1676-30AS7-13 implements constant-on-time (COT) control to achieve >0.9 power factor across universal AC input. Its BCM operation eliminates need for auxiliary winding, enabling single-winding inductor design and reducing BOM count.

Internal protection architecture includes leading-edge blanking (t_{ON_MIN} = 550 ns), 0.4 V reference voltage for current sensing, and dual thermal response: linear current foldback starting at +150 °C (T_REG) and latched shutdown at +170 °C (OTP).

Key Specifications

Pinout & Package

AL1676-30AS7-13 is housed in a thermally enhanced SO-7 package (7-pin, gull-wing, 2.54 mm pitch) with exposed pad for improved heat dissipation. Pin 6 is NC; Pin 7 is the drain of the internal HV MOSFET.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Buck LED driver applications.

Compared with AL1676-20AS7-13, the -30AS7-13 delivers 50% higher continuous current with 54% lower R_DS(ON), enabling 13 W operation in same SO-7 footprint; versus -20BS7-13, it trades 200 V lower V_DS for significantly better efficiency in standard 277 VAC systems.

Availability

AL1676-30AS7-13 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, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AL1676-30AS7-13 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 company specializing in discrete, analog, and mixed-signal devices, with emphasis on power management, LED lighting, and automotive-grade solutions.

The AL1676 product line targets cost-optimized, high-efficiency AC-DC LED drivers for commercial and industrial lighting, prioritizing integration, regulatory compliance, and thermal resilience in compact packages.

FAQ

What is the maximum recommended output power for AL1676-30AS7-13?

The AL1676-30AS7-13 is rated for ≤13 W output power, based on its 3.0 A continuous drain current, 300 V MOSFET rating, and SO-7 package thermal limit (0.8 W power dissipation at +50 °C ambient). This assumes proper PCB copper area (1"×1", 2 oz), 2.2 mH inductor, and 20 V minimum output voltage per datasheet guidance.

Does AL1676-30AS7-13 require an external current-sense resistor?

Yes - R5 is mandatory for current sensing. The CS pin uses a 0.8 V clamp voltage; R5 value determines peak inductor current via I_PEAK = 0.8 V / R5. For 300 mA output, typical R5 is 2.67 Ω (0.8 V / 0.3 A), verified in the datasheet's design equations and typical application circuit (Figure 1).

How does thermal foldback operate in AL1676-30AS7-13?

At junction temperatures above +150 °C (typical), the AL1676-30AS7-13 linearly reduces its internal 0.4 V reference voltage, thereby decreasing output current proportionally. This prevents thermal runaway while maintaining operation-unlike OTP, which latches off at +170 °C and requires power cycle recovery.

Can AL1676-30AS7-13 be used in continuous conduction mode (CCM)?

No - the AL1676-30AS7-13 is designed exclusively for boundary conduction mode (BCM). Its t_{OFF_MAX} = 180 µs and t_{OFF_MIN} = 6 µs enforcement, combined with lack of CCM control loop, means operation outside BCM causes incorrect current regulation and potential instability per functional description (DS38290 p.8).