Diodes Incorporated AL1697-40DS7-13

Overview

AL1697-40DS7-13 from Diodes Incorporated is a high-power-factor, boundary-conduction-mode (BCM) buck-boost LED driver IC with integrated 4A/670V Super-Junction MOSFET, ±3% current sense tolerance, 1.8Ω R_DS(ON), and NEMA SSL6-compliant dimming down to 1%. It delivers precise constant-current regulation for mains-dimmable LED lamps operating directly from AC line input.

For engineers reviewing the AL1697-40DS7-13 datasheet, AL1697-40DS7-13 pinout, AL1697-40DS7-13 application, or AL1697-40DS7-13 equivalent, key selection considerations include internal HV MOSFET voltage/current rating, thermal foldback trigger at +145°C, SO-7 package creepage isolation, and t_{ON_MAX} programmability via RT pin for deep-dimming optimization.

Technical Context

The AL1697-40DS7-13 implements single-stage, single-winding buck-boost topology with source-driver architecture and zero-crossing detection (ZCD) for BCM operation-eliminating auxiliary winding requirements. Its closed-loop constant-current control uses an internal 0.4V reference and COMP pin voltage feedback to regulate LED current across wide line (90–264VAC) and load ranges.

Protection logic integrates cycle-by-cycle OCP triggered at 1V on CS pin, UVLO (14.5V startup / 8.5V minimum operating), FB-based OVP/OSP, and dual thermal safeguards: linear current foldback above +145°C and latch-off OTP at +160°C. Dimming is achieved by limiting t_{ON_MAX} via external RT resistor in response to reduced conduction angle.

Key Specifications

Pinout & Package

AL1697-40DS7-13 is housed in a SO-7 package with extended creepage distance between Drain (Pin 7) and low-voltage pins (GND, CS, FB, COMP, RT, VCC) to meet reinforced insulation requirements for Class I/II LED lamp safety standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL1697-30BAS7-13 and AL1697-20CS7-13, the AL1697-40DS7-13 provides highest voltage margin (670V), lowest conduction loss (1.8Ω), and greatest output power capability-making it the only variant qualified for universal-input (90–305VAC), high-lumen, and thermally constrained LED lamp designs.

Availability

AL1697-40DS7-13 is available at Aetrix Electronics and suitable for LED retrofit lamps, commercial downlights, and dimmable LED tubes requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AL1697-40DS7-13 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 ICs, specializing in power management, signal integrity, and lighting solutions for industrial, consumer, and automotive markets.

The AL1697 belongs to Diodes' high-efficiency LED driver product line, engineered specifically for cost-sensitive, safety-certified, and dimmer-compatible AC/DC LED lighting applications without auxiliary windings or external HV switches.

FAQ

What is the maximum recommended ambient temperature for continuous operation?

The AL1697-40DS7-13 operates continuously up to +105°C ambient temperature under normal conditions. Above this, thermal foldback begins reducing output current at +145°C junction temperature to prevent overheating. Full-rated performance requires heatsinking or airflow to maintain junction temperature below +125°C per the datasheet's recommended operating conditions.

How does the AL1697-40DS7-13 achieve dimming without a microcontroller?

It uses analog dimming control: the COMP pin voltage rises as dimmer conduction angle decreases; when COMP reaches ~4V, the IC enters t_{ON_MAX} limiting mode, reducing average LED current. This hardware-based method requires no firmware, ensuring reliability and compliance with safety standards like UL 1598C.

Can AL1697-40DS7-13 drive multiple parallel LED strings?

No-it is designed for single-string constant-current operation. Driving parallel strings would cause current imbalance due to forward voltage mismatches, risking thermal runaway. For multi-string configurations, separate AL1697 channels or dedicated multi-channel drivers are required.

What is the purpose of the extra pin spacing in the SO-7 package?

The SO-7 package increases creepage distance between Pin 7 (Drain, 670V) and adjacent low-voltage pins (e.g., GND, CS, FB) to ≥5.1mm-meeting reinforced insulation requirements per IEC/UL 61347-1 and enabling Class II (double-insulated) lamp certification without additional isolation barriers.