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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated AL1673-20CSP-13

Name: AL1673-20CSP-13
Brand: Diodes Incorporated
SKU: AL1673-20CSP-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AL1673-20CSP-13

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: AL1673-20CSP-13.pdf

Description:: IC LED DRIVER OFFL PWM 2A 8SO 4K

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Product details

Overview

AL1673-20CSP-13 from Diodes Incorporated is a universal flyback/buck-boost LED driver IC with integrated 600V/2A MOSFET, operating in boundary conduction mode (BCM) for high PF (>0.9), low THD (<20%), and tight ±3% LED current regulation. It supports analog dimming (0.3–2.4V DC) and PWM dimming (1kHz, 3–100% range) and delivers up to 2A output current in SO-8EP package for dimmable AC-input LED lighting systems.

For engineers reviewing the AL1673-20CSP-13 datasheet, AL1673-20CSP-13 pinout, AL1673-20CSP-13 application, or AL1673-20CSP-13 equivalent, key selection criteria include internal MOSFET voltage rating (600V), valley-switching operation, primary-side regulation (PSR), thermal fold-back at +145°C, and dual-dimming interface compatibility with legacy TRIAC and PWM controllers.

Technical Context

The AL1673-20CSP-13 implements quasi-resonant valley switching to minimize switching losses and EMI, using primary-side regulation to eliminate optocouplers and secondary feedback circuits. Its control loop relies on FB pin sensing of auxiliary winding voltage and CS pin monitoring of primary current for constant-current output.

Dimming is implemented via APWM pin: analog mode uses linear voltage-to-current mapping (0.3–2.4V → 18–100% output), while PWM mode directly gates output current with logic-level signals (low <0.3V = off; high >2.4V = on). Protection architecture includes UVLO (17–20V startup), OVP (25–29.9V on VCC/FB), OCP (1.2V CS clamp), TFP (+145°C fold-back), and latch-type OTP (+165°C).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS Rating	600V - Enables direct connection to 230V_RMS AC mains without external HV MOSFET
I_D Continuous	2A - Supports up to 2A LED load current in thermally adequate PCB layout
V_REF (CS)	0.3V ±1.5% - Sets precise LED current via R_CS; enables ±3% output current tolerance
Dimming Range (PWM)	3–100% at 1kHz - Compatible with standard wall-mounted PWM dimmers and microcontroller GPIO
PF / THD	>0.9 / <20% - Meets IEC 61000-3-2 Class C requirements for lighting equipment
Thermal Fold-back	+145°C - Gradually reduces output current above ambient to prevent thermal runaway
Startup Current	0.8µA max - Minimizes power loss in start-up resistor network under no-load conditions

Pinout & Package

AL1673-20CSP-13 is housed in an SO-8EP (exposed pad) package with thermal pad connected to internal MOSFET drain for enhanced heat dissipation. The exposed pad (Pin 9) must be soldered to a dedicated copper pour for θ_JA = 65°C/W performance.

Pin/Terminal	Circuit Role	Design Meaning
1 (CS)	Current sense input	Connects to source of internal MOSFET via R_CS; senses peak primary current for OCP and CC regulation
2 (GND)	Power and signal ground	Reference node for all analog blocks; must be low-impedance path to minimize noise coupling
3,4,9 (DRAIN)	Drain of integrated MOSFET	High-voltage switching node; connects to primary winding; exposed pad (Pin 9) is electrically identical
5 (VCC)	IC supply rail	Powered by auxiliary winding after startup; UVLO threshold 17–20V ensures reliable turn-on
6 (FB)	Feedback voltage input	Senses auxiliary winding voltage for PSR-based output voltage regulation and OVP detection
7 (APWM)	Dimming control input	Accepts analog DC (0.3–2.4V) or digital PWM signal; determines output current level or on/off state
8 (COMP)	Loop compensation node	Connects to RC network (R_COMP/C_COMP) to stabilize control loop; pre-charged during startup

Key Features

Feature	Design Value
Valley-switching operation	Reduces switching loss and EMI by turning on MOSFET at minimum drain voltage point in BCM
Integrated 600V/2A MOSFET	Eliminates external HV switch, reducing BOM count and board space in single-stage LED drivers
Primary-side regulation (PSR)	Removes optocoupler and TL431, lowering system cost and improving long-term reliability
Tight LED current variation	±3% over line/load/temperature - Ensures consistent luminous output across operating conditions
Dual-dimming interface	Single APWM pin supports both analog and PWM protocols without external mode-select circuitry

Applications

Smart Residential Lighting

Commercial Downlight Drivers

Use Scenario: Dimmable LED downlights in homes with trailing-edge TRIAC dimmers and smart home hubs.

IC Role / Device Role / Timing Role: Primary-side constant-current controller implementing analog dimming via filtered 0–10V signal derived from TRIAC phase-cut waveform.

Use Value: Delivers flicker-free 18–100% dimming with <2% current ripple and meets ENERGY STAR Lamps V2.1 THD limits.

Use Scenario: High-bay LED fixtures in warehouses requiring robust thermal management and stable output under wide ambient temperature swings.

IC Role / Device Role / Timing Role: Universal flyback controller with thermal fold-back limiting output current above +60°C ambient to prevent LED lumen depreciation.

Use Value: Maintains ±3% current accuracy from –40°C to +105°C ambient, extending LED lifetime beyond 50,000 hours.

Industrial Panel-Mount LED Signs

Outdoor Streetlight Drivers

Use Scenario: Enclosed LED signage with limited airflow and exposure to industrial voltage transients.

IC Role / Device Role / Timing Role: Buck-boost topology LED driver providing constant current despite wide input variation (90–305V_AC) and brownouts.

Use Value: Sustains regulated output during 100ms dips to 120V_RMS, preventing visible light interruption.

Use Scenario: IP67-rated streetlights powered from MV distribution lines with surge-prone environments.

IC Role / Device Role / Timing Role: Flyback controller with integrated 600V MOSFET and latch-type OTP protecting against sustained overtemperature events.

Use Value: Survives repeated 6kV/3kA surges per IEC 61000-4-5 Level 4 when paired with appropriate MOV/clamp network.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP4005GQ-Z (Monolithic Power)	40V max V_CC, requires external 600V MOSFET; no integrated thermal fold-back	Needs additional HV FET and discrete TFP circuit; higher BOM cost and layout complexity	Preferred only when higher switching frequency (>300kHz) and smaller magnetics are required
BP5658D (Bright Power)	650V/1.5A MOSFET; fixed 100kHz frequency; no analog dimming support	Limited to PWM-only dimming; lower current capability restricts use to <1.5A LED loads	Selected for cost-sensitive non-dimmable or PWM-only applications where 2A drive is unnecessary

Compared with MP4005GQ-Z and BP5658D, the AL1673-20CSP-13 uniquely combines integrated 600V/2A switching, analog+PWM dimming, and thermal fold-back in a single SO-8EP package-enabling compact, compliant, and thermally resilient designs without external protection components.

Availability

AL1673-20CSP-13 is available at Aetrix Electronics and suitable for smart residential lighting, commercial downlight drivers, industrial panel-mount LED signs, and outdoor streetlight drivers requiring stable component supply and full production traceability.

Supply support for AL1673-20CSP-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/TS 16949-certified manufacturing.

The AL1673 belongs to Diodes' high-efficiency LED driver product line, designed specifically for cost-sensitive, dimmable, single-stage AC/DC LED lighting applications requiring high PF, low THD, and integrated protection.

FAQ

What dimming protocols does AL1673-20CSP-13 natively support?

The AL1673-20CSP-13 supports two native dimming modes via its APWM pin: analog dimming (0.3–2.4V DC input, 18–100% linear current control) and PWM dimming (logic-level signal at 1kHz, 3–100% duty cycle). No external mode-select circuitry is needed-the IC auto-detects protocol based on input signal characteristics.

Can AL1673-20CSP-13 operate in buck-boost topology without transformer isolation?

Yes-AL1673-20CSP-13 supports non-isolated buck-boost configuration using a coupled inductor. In this mode, it maintains primary-side regulation, constant-current output, and full protection suite (OVP, OCP, OTP), enabling compact, low-cost drivers for DC-input or isolated AC-input applications where galvanic separation is not required.

What is the maximum recommended ambient temperature for continuous operation?

The AL1673-20CSP-13 operates continuously up to +105°C ambient temperature under normal conditions. Above +105°C, thermal fold-back begins at +145°C junction temperature, reducing output current to maintain safe operation. Full shutdown occurs only at +165°C junction temperature, triggering latch-mode OTP requiring power cycle recovery.

How does the internal 600V MOSFET impact system-level safety certification?

The integrated 600V MOSFET eliminates external HV switching components, reducing creepage/clearance risks and simplifying EN 61347-1 and UL 8750 compliance. Its guaranteed breakdown voltage margin (>20% above 230V_RMS × √2) and built-in OCP/OVP ensure robust fault handling during surge events, easing design validation for Class II and SELV-compliant lighting systems.

AL1673-20CSP-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: AC DC Offline Switcher

Topology:: Flyback, Step-Down (Buck), Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 7V

Voltage - Supply (Max):: 30V

Voltage - Output:: 600V

Current - Output / Channel:: 2A

Frequency:: 120kHz ~ 230kHz

Dimming:: Analog, PWM

Applications:: General Purpose

Operating Temperature:: -40°C ~ 105°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO-EP

AL1673-20CSP-13 FAQ

1.How can I place an order for AL1673-20CSP-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AL1673-20CSP-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 AL1673-20CSP-13 reliable?

The price and inventory of AL1673-20CSP-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL1673-20CSP-13 is usually 5 days.

3.What payment methods are accepted for AL1673-20CSP-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL1673-20CSP-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AL1673-20CSP-13?

AL1673-20CSP-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AL1673-20CSP-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 AL1673-20CSP-13?

For technical support, including AL1673-20CSP-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL1673-20CSP-13 requirements.

6.How does Aetrix verify that AL1673-20CSP-13 is sourced from the original manufacturer or authorized distributors?

All AL1673-20CSP-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 AL1673-20CSP-13 meets industry standards.

7.What is the process for return or replacement of AL1673-20CSP-13?

All AL1673-20CSP-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL1673-20CSP-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 AL1673-20CSP-13 part is unused and in its original packaging.

Return procedure for AL1673-20CSP-13:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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