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Diodes Incorporated AL1666AS-13
- Part No.:
- AL1666AS-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AL1666AS-13.pdf
- Description:
- LED OFFLINE DRIVER SO-8 T&R 4K
- Quantity:
- Payment:
- Shipping:
Inventory:2,989
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Product details
Overview
AL1666AS-13 from Diodes Incorporated is a high-performance primary-side regulation (PSR) LED controller for dimmable flyback and buck-boost topologies, delivering ±2% LED current line/load regulation across 90–305VAC input, 0.4V±1.5% internal CS reference, and 1–100% analog/PWM-to-DC dimming range. It operates in boundary conduction mode (BCM), achieving >0.9 power factor and <20% THD without optocouplers or secondary feedback circuitry - deployed in commercial-grade LED drivers for indoor lighting and smart luminaires.
For engineers reviewing the AL1666AS-13 datasheet, AL1666AS-13 pinout, AL1666AS-13 application, or AL1666AS-13 equivalent, key selection criteria include PSR-based CC accuracy under universal AC input, dual-dimming interface compatibility (ADIM/PWMD), integrated thermal fold-back and OTP protection, and SO-8 package suitability for compact driver PCB layouts.
Technical Context
The AL1666AS-13 implements valley-switching quasi-resonant control to minimize switching losses and EMI while maintaining tight constant-current regulation via primary-side sensing. Its internal error amplifier (27 µA/V transconductance) and programmable COMP pin enable stable loop compensation with 1–2 µF external capacitance.
It supports two independent dimming paths: ADIM accepts 0.05–2.4 V DC for linear analog dimming; PWMD accepts 0.5–20 kHz PWM signals with external RC filtering to generate equivalent DC control voltage. Both paths modulate the 0.4 V CS reference to scale output current proportionally across 1–100% range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (CS) | 0.4 V ±1.5% - sets precise LED current threshold with ±2% line/load regulation over 90–305 VAC input |
| Dimming Range | 1–100% - supported by both analog (0.05–2.4 V on ADIM) and PWM-to-DC (0.5–20 kHz on PWMD) modes |
| Power Factor | >0.9 - achieved via constant-on-time BCM operation without active PFC stage |
| THD | <20% - meets IEC 61000-3-2 Class C requirements for lighting equipment |
| OVP Threshold | 2.86–3.26 V on FB pin - triggers hiccup-mode shutdown if auxiliary winding voltage exceeds CV threshold |
| Thermal Fold-Back | Activates at +150°C - linearly reduces CS reference to limit input power before OTP shutdown at +180°C |
| VCC Operating Range | 8.5–23 V - enables self-biasing from auxiliary winding after startup, with UVLO at 13.4–16.5 V |
Pinout & Package
AL1666AS-13 is housed in an SO-8 (Standard) surface-mount package with exposed pad for thermal dissipation (θJA = 136°C/W, θJC = 30°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ADIM | Analog dimming input | Accepts 0.05–2.4 V DC to directly scale LED current; >2.35 V enables full 100% output |
| 2 PWMD | PWM dimming signal input | Receives 0.5–20 kHz digital signal; requires external RC filter to convert to DC control voltage |
| 3 COMP | Error amplifier compensation node | Connects to 1–2 µF capacitor and resistor network to stabilize control loop and optimize PF/THD |
| 4 CS | Primary current sense input | Monitors voltage across RCS resistor; triggers OCP when ≥2 V, clamps peak current at IPEAK(MAX) = 2 V / RCS |
| 5 GND | Power and signal ground reference | Common return path for VCC, CS, FB, COMP, ADIM, PWMD; must be low-impedance layout |
| 6 OUT | Gate driver output | Drives external MOSFET gate with 100 ns rise/fall time; clamped at 9.8–15.5 V for safe turn-on |
| 7 VCC | IC supply voltage | Powered initially by startup resistor, then sustained by auxiliary winding; UVLO at 13.4–16.5 V |
| 8 FB | Auxiliary winding feedback | Senses reflected output voltage; triggers OVP if >3.26 V, OSP if <0.4 V during short-circuit condition |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler and secondary-side feedback components, reducing BOM cost and improving reliability |
| Valley-switching BCM control | Reduces MOSFET switching loss and EMI emissions while enabling high efficiency (>85% typical) |
| Dual-dimming interface | Supports both 0–2.4 V analog and 0.5–20 kHz PWM inputs - compatible with 0–10 V and DALI-2 driver interfaces |
| Integrated protection suite | Includes UVLO, OVP, OSP, OCP, winding/diode short detection, TFP (+150°C), and OTP (+180°C) |
| Tight current regulation | ±2% LED current variation across full input (90–305 VAC) and load (full-to-half) ranges |
Applications
| Commercial Indoor Lighting | 0–10 V Dimmable Luminaires |
|---|---|
|
Use Scenario: LED troffer and panel drivers for office buildings and retail spaces requiring smooth, flicker-free dimming down to 1%. IC Role / Device Role / Timing Role: PSR LED controller managing flyback topology with primary-side current sensing and auxiliary-winding voltage feedback. Use Value: Enables compact, cost-effective driver design without optocouplers while meeting ENERGY STAR® and DLC Premium requirements for PF >0.9 and THD <20%. |
Use Scenario: Retrofit LED drivers replacing magnetic low-voltage transformers in legacy 0–10 V control systems. IC Role / Device Role / Timing Role: Analog dimming interface (ADIM pin) converts 0–10 V control signal to proportional LED current with 1–100% linear response. Use Value: Delivers seamless compatibility with building automation systems using standard 0–10 V wiring, eliminating need for external DAC or signal conditioning. |
| Smart Residential Lighting | Industrial LED Power Supplies |
|
Use Scenario: Integrated LED modules in smart bulbs and connected fixtures supporting app-controlled dimming via PWM input. IC Role / Device Role / Timing Role: PWM-to-DC dimming engine (PWMD pin) converts microcontroller-generated PWM into stable DC reference for current scaling. Use Value: Allows direct MCU interface without additional ICs; supports fast-response dimming (≤20 kHz) with minimal latency and no audible noise. |
Use Scenario: High-reliability LED drivers for warehouse high-bay and street lighting operating in wide ambient temperature ranges (−40°C to +105°C). IC Role / Device Role / Timing Role: Thermal fold-back and overtemperature protection maintain safe operation under sustained overload or poor heatsinking conditions. Use Value: Prevents thermal runaway by linearly reducing output current above +150°C, extending system lifetime and avoiding catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PSR LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL1666A-13 | Same die, identical electrical specs and pinout; AL1666AS-13 is tape-and-reel variant of AL1666A-13 | No functional difference; both support same flyback/buck-boost topologies and dimming modes | Select AL1666AS-13 for automated SMT assembly; AL1666A-13 for manual prototyping or small-batch use |
| AL1667AS-13 | Enhanced version with improved THD (<10%) and extended dimming frequency range (up to 50 kHz PWM) | Better suited for high-end architectural lighting where ultra-low THD and faster dimming response are required | Choose AL1667AS-13 only if THD <10% or PWM >20 kHz is mandatory; otherwise AL1666AS-13 offers optimal cost/performance balance |
Compared with AL1666A-13, AL1666AS-13 provides identical performance in tape-and-reel packaging for production lines, while AL1667AS-13 adds higher PWM bandwidth and lower THD at increased BOM cost - making AL1666AS-13 the preferred choice for mainstream commercial LED drivers requiring proven reliability and cost efficiency.
Availability
AL1666AS-13 is available at Aetrix Electronics and suitable for commercial indoor lighting, 0–10 V dimmable luminaires, and industrial LED power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AL1666AS-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 with ISO 9001 and IATF 16949 certified facilities.
The AL1666AS-13 belongs to Diodes' AL16xx family of PSR LED controllers, designed specifically for cost-sensitive, high-efficiency, dimmable AC/DC LED drivers targeting non-automotive lighting markets.
FAQ
What dimming interfaces does AL1666AS-13 support?
AL1666AS-13 supports two independent dimming methods: analog dimming via 0.05–2.4 V DC applied to the ADIM pin, and PWM-to-DC dimming via 0.5–20 kHz digital signals on the PWMD pin with external RC filtering. Both achieve 1–100% linear LED current control without external DACs or op-amps.
How does AL1666AS-13 achieve primary-side regulation without an optocoupler?
It uses auxiliary winding voltage sensing on the FB pin to estimate output voltage and primary-side current sensing on the CS pin to regulate LED current. Internal algorithms correlate tONS (secondary discharge time) and VFB to maintain constant current without secondary feedback, reducing component count and improving reliability.
What protections are integrated into AL1666AS-13?
AL1666AS-13 integrates eight protection functions: Under Voltage Lock-Out (UVLO), Output Over-Voltage Protection (OVP), Output Short Protection (OSP), Over-Current Protection (OCP), Winding Short Circuit Detection, Secondary Diode Short Detection, Thermal Fold-Back (TFP at +150°C), and Over-Temperature Protection (OTP at +180°C).
Can AL1666AS-13 operate in both flyback and buck-boost topologies?
Yes - the AL1666AS-13 is explicitly designed for both flyback and buck-boost configurations, as confirmed by its dual-application schematics (Figures 1 and 2 in DS43850). Pin functions (e.g., FB for auxiliary sensing, CS for primary current) remain identical across both topologies, requiring only transformer/winding adjustments.
AL1666AS-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8.5V
- Voltage - Supply (Max):
- 23V
- Voltage - Output:
- 0.4V ~ 23V
- Current - Output / Channel:
- -
- Frequency:
- 150kHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
AL1666AS-13 FAQ
1.How can I place an order for AL1666AS-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL1666AS-13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AL1666AS-13 reliable?
The price and inventory of AL1666AS-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL1666AS-13 is usually 5 days.
3.What payment methods are accepted for AL1666AS-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL1666AS-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL1666AS-13?
AL1666AS-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL1666AS-13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AL1666AS-13?
For technical support, including AL1666AS-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL1666AS-13 requirements.
6.How does Aetrix verify that AL1666AS-13 is sourced from the original manufacturer or authorized distributors?
All AL1666AS-13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AL1666AS-13 meets industry standards.
7.What is the process for return or replacement of AL1666AS-13?
All AL1666AS-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL1666AS-13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AL1666AS-13 part is unused and in its original packaging.
Return procedure for AL1666AS-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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