Diodes Incorporated AL1792AFE-13

Overview

AL1792AFE-13 from Diodes Incorporated is a dual-channel, ratio-optimized constant-current LED driver for tunable white smart lighting systems. It delivers independent analog or PWM dimming per channel, supports 0.5A per channel (1.0A total), operates from 6.5V–30V input, and features e-flicker-free PWM dimming down to 0.4% at 4kHz. Used with AC-DC converters and wireless MCUs in SCL bulbs.

For engineers reviewing the AL1792AFE-13 datasheet, AL1792AFE-13 pinout, AL1792AFE-13 application, or AL1792AFE-13 equivalent, key selection criteria include channel current matching accuracy (±4%), thermal shutdown threshold (160°C), LED power good reporting (LEDPG), and fault reporting via open-drain FAULTB for system-level diagnostics in connected lighting designs.

Technical Context

The AL1792AFE-13 integrates two matched low-side current sinks with fixed 1:1 channel current ratio, enabling precise color temperature control in 2-channel tunable white fixtures. Each channel accepts independent PWM or analog dimming signals on dedicated PWM1/PWM2 pins, with internal pulldowns ensuring defined state when unconnected.

It implements real-time LED string monitoring for open/short detection, UVLO (6.3V turn-on, 6V turn-off with 300mV hysteresis), and over-temperature protection (160°C shutdown, 100°C recovery). Fault status is reported via open-drain FAULTB; LED supply headroom is monitored per channel and consolidated on LEDPG.

Key Specifications

Pinout & Package

AL1792AFE-13 is housed in a U-DFN4030-14 package (4.0mm × 3.0mm, 0.5mm pitch) with exposed thermal pad connected internally to GND. The package enables compact, thermally efficient layout in space-constrained smart bulb PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel LED driver applications.

Compared with AL1794AFE-13, AL1792AFE-13 reduces footprint and BOM cost for 2-channel use cases while retaining identical dimming fidelity and protection features; versus AL8862Q-7, it adds dual-channel coordination, diagnostic reporting, and flicker-free deep dimming essential for smart lighting certification.

Availability

AL1792AFE-13 is available at Aetrix Electronics and suitable for tunable white smart bulbs, LED troffers, and connected panel lights requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AL1792AFE-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and lighting solutions for industrial, automotive, and consumer markets.

The AL179x family targets smart-connected lighting systems, delivering integrated dimming control, fault diagnostics, and thermal management in compact packages to simplify design of tunable white and color LED products.

FAQ

What dimming methods does AL1792AFE-13 support, and how are they selected?

The AL1792AFE-13 supports both analog and PWM dimming on the same PWM1/PWM2 pins. At startup, presence of ≥500Hz PWM signal configures the channel for PWM mode; absence configures it for analog mode. Analog dimming uses 0.4–1.5V input to linearly scale current; PWM dimming supports 0.4% depth at 4kHz with 2.5μs minimum pulse width.

How does the AL1792AFE-13 handle LED string faults, and what reporting mechanisms are provided?

It detects LED open, short, UVLO, and over-temperature faults independently per channel. Fault status is reported via open-drain FAULTB (low-active) and LEDPG (low-active when any channel's V_LEDx headroom falls below dropout voltage). Both pins require external pull-up resistors and support wired-OR sharing across multiple devices.

Can AL1792AFE-13 drive LED strings with different forward voltages, and how is current accuracy maintained?

Yes - its low-side current sink architecture allows common-anode LED strings with varying V_F, as each channel regulates current independently. Current accuracy is maintained at ±4% across channels and temperature (–40°C to +125°C) via precision internal reference and matched current ratio circuitry, validated with RSET = 12kΩ.

What thermal management provisions does the AL1792AFE-13 include, and how is PCB layout optimized?

It features over-temperature protection (160°C shutdown, 100°C auto-recovery) and a U-DFN4030-14 package with exposed thermal pad internally tied to GND. For optimal performance, the pad must be soldered to a large PCB ground plane with ≥4 thermal vias (0.3mm diameter) to inner/outer layers to achieve θ_JA ≈ 55°C/W.