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Diodes Incorporated AL1666S-13
- Part No.:
- AL1666S-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AL1666S-13.pdf
- Description:
- IC LED DRIVER CTRLR PWM 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,306
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Product details
Overview
AL1666S-13 from Diodes Incorporated is a high-performance primary-side regulation (PSR) LED controller for dimmable flyback and buck-boost topologies, delivering accurate constant current (CC) regulation without optocoupler or secondary feedback. It operates in boundary conduction mode (BCM), achieves power factor >0.9 and THD <20% across universal AC input (90–305 VAC), supports 1–100% analog/PWM-to-DC dimming, and integrates full protection suite including OVP, OSP, OCP, TFP, and OTP.
For engineers reviewing the AL1666S-13 datasheet, AL1666S-13 pinout, AL1666S-13 application, or AL1666S-13 equivalent, this controller is selected for cost-sensitive, high-efficiency LED drivers requiring stable CC output, wide dimming range, and robust thermal/overvoltage protection in SO-8 packaged designs.
Technical Context
The AL1666S-13 implements valley-switching quasi-resonant control to minimize switching losses and EMI while maintaining high efficiency. Its PSR architecture samples auxiliary winding voltage for output regulation, eliminating optocouplers and simplifying BOM.
It features dual dimming interfaces: ADIM accepts 0–2.4 V DC for analog dimming; PWMD accepts 0.5–20 kHz PWM signals with external capacitor for PWM-to-DC conversion. Internal reference voltage is tightly regulated at 0.4 V ±1.5%, enabling ±2% LED current line/load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 0.4 V ±1.5% - enables ±2% LED current accuracy over line/load variations |
| Dimming Range | 1%–100% - supports full-scale brightness control via analog or PWM-to-DC inputs |
| Power Factor | >0.9 - meets EN61000-3-2 Class C requirements for lighting equipment |
| THD | <20% - reduces harmonic distortion on universal AC input (90–305 VAC) |
| fMAX | 150 kHz - sets upper switching frequency limit for EMI filtering and transformer design |
| VCS_CLAMP | 2 V - defines peak primary current limit for cycle-by-cycle OCP (IPEAK_MAX = 2 V / RCS) |
| TREG | +150 °C - initiates thermal fold-back to reduce output power before OTP shutdown at +180 °C |
Pinout & Package
AL1666S-13 is housed in an SO-8 (Standard) package with exposed pad for thermal performance. Pin assignments are validated per Diodes DS42417 Rev. 1–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ADIM | Analog dimming input | Accepts 0–2.4 V DC signal; maps linearly to 1–100% LED current output |
| 2 PWMD | PWM dimming input | Accepts 0.5–20 kHz digital signal; requires external capacitor for PWM-to-DC conversion |
| 3 COMP | Error amplifier compensation | Connects RC network (RCOMP/CCOMP) to stabilize control loop and optimize PF/THD |
| 4 CS | Primary current sense | Monitors MOSFET source voltage; triggers OCP when ≥2 V (cycle-by-cycle) |
| 5 GND | Ground reference | Common return for control logic, driver, and sensing circuits |
| 6 OUT | Gate driver output | Drives external N-channel MOSFET; clamped to 9.8–15.5 V for safe gate turn-on |
| 7 VCC | Supply voltage input | Powered by auxiliary winding; UVLO activates below 5.8 V, OVP trips above 21.8–29.5 V |
| 8 FB | Auxiliary winding feedback | Senses reflected output voltage; triggers FB-OVP if >2.86–3.26 V (latches for 16 s) |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation (PSR) | Eliminates optocoupler and secondary feedback circuitry-reduces BOM count and system cost |
| Valley-switching operation | Reduces MOSFET switching loss and improves EMI performance in BCM mode |
| Dual dimming interface | Supports both 0–2.4 V analog and 0.5–20 kHz PWM-to-DC dimming with shared ADIM/PWMD pins |
| Integrated protection suite | Includes UVLO, VCC/OVP, FB-OVP, OSP, OCP, winding/diode short detection, TFP, and OTP |
| Line/load regulation | ±2% LED current variation across 90–305 VAC input and full-to-half load conditions |
Applications
| 0–10 V Dimmable LED Luminaires | Smart Residential LED Drivers |
|---|---|
|
Use Scenario: Commercial downlights and troffers using standard 0–10 V dimming interface with universal AC input. IC Role / Device Role / Timing Role: PSR LED controller regulating constant current output while interpreting 0–10 V analog signal on ADIM pin. Use Value: Delivers 1–100% smooth dimming without secondary feedback, meeting DLC Premium efficiency requirements. |
Use Scenario: Integrated LED modules in smart home systems requiring compact, thermally robust drivers with PWM compatibility. IC Role / Device Role / Timing Role: Primary-side flyback controller accepting PWM signals on PWMD pin and converting to DC current setpoint. Use Value: Enables seamless integration with microcontroller-based lighting hubs via standardized PWM timing (0.5–20 kHz). |
| Industrial LED High-Bay Lighting | Universal Input Constant Current Sources |
|
Use Scenario: High-power LED fixtures operating in warehouses with wide ambient temperature range (−40°C to +105°C). IC Role / Device Role / Timing Role: Buck-boost topology controller providing stable CC output under 90–305 VAC input with thermal fold-back at +150°C. Use Value: Maintains ±2% current accuracy across line/load and prevents thermal runaway via adaptive TFP/OTP coordination. |
Use Scenario: Programmable lab power supplies and test equipment requiring precise, adjustable constant current sourcing. IC Role / Device Role / Timing Role: Isolated CC source controller using PSR feedback and external RCS resistor to set output current (IO = NPS·VREF / 2RCS). Use Value: Enables accurate, low-drift current setting (0.4 V reference ±1.5%) without secondary sensing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NCL30086 | Fixed-frequency CCM flyback controller; requires optocoupler for regulation; no integrated PWM-to-DC conversion | Limited to non-dimming or basic PWM-only systems; lacks analog dimming and PSR simplicity | Choose when legacy optocoupler-based designs require upgrade path with minimal layout change |
| Infineon ICE2QS03G | Quasi-resonant controller with PSR but no dedicated ADIM/PWMD pins; dimming requires external circuitry | Requires external op-amp or MCU to implement 1–100% dimming; no native analog/PWM dual-mode support | Prefer when existing designs already use ICE2QS03G and only need incremental dimming capability |
Compared with NCL30086 and ICE2QS03G, the AL1666S-13 uniquely integrates dual-mode dimming, PSR, and full protection in SO-8-reducing component count by ≥4 vs. optocoupler-based alternatives and enabling direct 0–10 V/PWM interface without external signal conditioning.
Availability
AL1666S-13 is available at Aetrix Electronics and suitable for 0–10 V dimmable luminaires, smart residential LED drivers, and industrial high-bay lighting requiring stable component supply, RoHS-compliant packaging, and automotive-grade traceability options.
Supply support for AL1666S-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 high-reliability power management, signal integrity, and lighting solutions for industrial, consumer, and automotive markets.
The AL1666S-13 belongs to Diodes' LED lighting controller product line, designed specifically for cost-optimized, high-PF, dimmable LED drivers using primary-side regulation in flyback and buck-boost topologies.
FAQ
What dimming modes does the AL1666S-13 support, and how are they configured?
The AL1666S-13 supports two independent dimming modes: analog dimming (0–2.4 V DC applied directly to ADIM pin) and PWM-to-DC dimming (0.5–20 kHz PWM signal applied to PWMD pin with ≥100 nF capacitor to ADIM). No external DAC or MCU is required-the IC internally converts PWM duty cycle to equivalent DC current setpoint.
How does the AL1666S-13 achieve primary-side regulation without an optocoupler?
It samples voltage from the transformer's auxiliary winding via the FB pin to reconstruct output voltage and uses the CS pin to monitor primary current. Internal algorithms correlate auxiliary voltage, primary current, and switching timing to regulate LED current with ±2% accuracy-eliminating optocoupler, TL431, and secondary feedback components.
What protections are integrated, and how do they respond to fault conditions?
Integrated protections include UVLO (shuts down below 5.8 V), VCC/FB-OVP (latches or discharges VCC), OSP (drops switching frequency to 4 kHz on short), OCP (cycle-by-cycle at 2 V on CS), winding/diode short detection (latches VCC for 16 s), TFP (+150 °C fold-back), and OTP (+180 °C shutdown). All operate autonomously without external circuitry.
Can the AL1666S-13 be used in both flyback and buck-boost topologies, and what design changes are needed?
Yes-it supports both topologies with identical IC configuration. For flyback, connect FB to auxiliary winding; for buck-boost, connect FB to output voltage divider. External components (transformer/inductor, RCS, RCOMP/CCOMP) must be reselected per topology equations in DS42417, but pin functions and protection behavior remain unchanged.
AL1666S-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):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8.5V
- Voltage - Supply (Max):
- 21.8V
- Voltage - Output:
- 400mV
- Current - Output / Channel:
- -
- Frequency:
- 150kHz
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
AL1666S-13 FAQ
1.How can I place an order for AL1666S-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL1666S-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 AL1666S-13 reliable?
The price and inventory of AL1666S-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL1666S-13 is usually 5 days.
3.What payment methods are accepted for AL1666S-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL1666S-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL1666S-13?
AL1666S-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL1666S-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 AL1666S-13?
For technical support, including AL1666S-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL1666S-13 requirements.
6.How does Aetrix verify that AL1666S-13 is sourced from the original manufacturer or authorized distributors?
All AL1666S-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 AL1666S-13 meets industry standards.
7.What is the process for return or replacement of AL1666S-13?
All AL1666S-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL1666S-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 AL1666S-13 part is unused and in its original packaging.
Return procedure for AL1666S-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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