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Diodes Incorporated AL1678-08BS7-13
- Part No.:
- AL1678-08BS7-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Datasheet:
-
AL1678-08BS7-13.pdf
- Description:
- IC LED DRIVER OFFL NO 800MA 7SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,987
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Product details
Overview
AL1678-08BS7-13 from Diodes Incorporated is a universal-input (85–277 VAC), boundary-conduction-mode (BCM) buck LED driver IC with integrated 500 V/0.8 A MOSFET in SO-7 package. It delivers ±3% constant current accuracy, 90%+ efficiency, and supports retrofit LED lamps up to 8 W with thermal fold-back and output open/short protection.
For engineers reviewing the AL1678-08BS7-13 datasheet, AL1678-08BS7-13 pinout, AL1678-08BS7-13 application, or AL1678-08BS7-13 equivalent, this page provides verified technical context, validated pin functions, real-world design meaning of key specs, and confirmed alternative options for non-isolated constant-current LED driver designs.
Technical Context
The AL1678-08BS7-13 implements valley-switching control in BCM to minimize EMI and switching losses while maintaining tight current regulation across line and load variations. Its internal 500 V MOSFET eliminates need for external high-voltage switches.
It uses peak current sensing referenced to 0.400 V (typ) on the CS pin, with programmable tON (400 ns–35 µs) and tOFF (6–200 µs) limits to enforce stable boundary-mode operation. ROVP pin sets output open voltage via external resistor; LC pin enables line compensation for consistent performance over wide AC input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 85–277 VAC universal input - enables single-BOM design for global mains-powered LED lamps. |
| Output Current Accuracy | ±3% tolerance - ensures consistent lumen output across production units and temperature (-40°C to +105°C). |
| Integrated MOSFET | 500 V / 0.8 A - supports ≤8 W output power without external HV switch; RDS(on) = 16–20 Ω (typ) minimizes conduction loss. |
| Current Sense Reference | 0.400 V (typ) at CS pin - defines peak inductor current; enables precise IOUT setting via RSENSE = 2 × VREF/IOUT. |
| Thermal Fold-Back Threshold | +140°C junction - linearly reduces output current above this point to prevent thermal runaway in enclosed fixtures. |
| Standby & Operating Current | 170 µA start-up / 100 µA static - enables low-loss VCC supply without auxiliary winding, reducing BOM count. |
| Protection Features | UVLO, LEB, OTP (+170°C latch), output open/short, reload detection - eliminates need for discrete fault management circuitry. |
Pinout & Package
AL1678-08BS7-13 is housed in a 7-pin SO-7 package with exposed drain pad for thermal dissipation. Pin 7 (Drain) connects directly to the internal 500 V MOSFET's drain terminal; Pin 1 (OUT) is its source node. The package supports surface-mount reflow assembly per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Internal MOSFET source | Connects to inductor low-side node and system ground return path; carries full output current. |
| 2 (VCC) | IC power supply | Accepts 8.5–16.2 V DC; powers internal logic and gate driver; clamped at 16.2 V to protect bias circuitry. |
| 3 (ROVP) | Output open voltage reference | Sets LED open-circuit voltage via external resistor; internal 0.46 V reference enables safe capacitor derating. |
| 4 (GND) | Analog/digital ground | Common reference for CS, ROVP, LC; must be low-impedance connection to minimize noise coupling into current sense path. |
| 5 (CS) | Current sense input | Monitors peak inductor current via shunt resistor; compares to 0.400 V internal reference to terminate tON. |
| 6 (LC) | Line compensation | Adjusts current regulation gain vs. input voltage to maintain constant output current across 85–277 VAC range. |
| 7 (Drain) | Internal MOSFET drain | High-side switch node; connects to bulk capacitor and inductor high-side; requires adequate copper pour for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Valley-switching control | Reduces MOSFET turn-on loss by triggering at zero-current crossing, enabling >90% efficiency without snubbers. |
| Single-winding inductor support | Eliminates auxiliary winding requirement for VCC generation and demagnetization detection, cutting BOM cost and layout area. |
| Tight tON/tOFF timing limits | 400 ns min tON and 6 µs min tOFF prevent DCM/CCM mode shift, ensuring stable BCM operation under all line/load conditions. |
| Thermal fold-back + OTP | +140°C fold-back onset and +170°C latch shutdown provide graded thermal protection - avoids abrupt failure during ambient temperature excursions. |
| SO-7 package with exposed drain | Enables direct thermal coupling to PCB copper; 190°C/W θJA allows 0.65 W dissipation at +50°C ambient for compact lamp designs. |
Applications
| Retrofit LED Lamps | High-Voltage DC-DC LED Driver |
|---|---|
|
Use Scenario: Replacing incandescent or CFL bulbs in E26/E27 sockets with integrated LED modules powered directly from AC mains. IC Role / Device Role / Timing Role: Primary constant-current controller operating in BCM to regulate LED string current independent of input voltage variation. Use Value: Enables 8 W, 120 mA output with ±3% current accuracy and built-in open/short protection - eliminating need for external fault monitoring. |
Use Scenario: Industrial signage or architectural lighting where 277 VAC high-line input supplies isolated or non-isolated LED arrays. IC Role / Device Role / Timing Role: Buck-stage current regulator using valley-switching to meet Class B EMI limits without added filtering components. Use Value: Reduces system EMI test risk and bill-of-materials by integrating 500 V MOSFET and eliminating auxiliary winding and VCC diode. |
| General Purpose Constant Current Source | Commercial Downlight Driver |
|
Use Scenario: Low-cost constant-current supply for sensor biasing, laser diode drivers, or analog circuitry requiring stable mA-level current. IC Role / Device Role / Timing Role: Precision current reference generator using internal 0.400 V CS threshold and programmable tOFF for adjustable output compliance. Use Value: Delivers 120 mA with <±3% tolerance across -40°C to +105°C ambient - no trimming required in production. |
Use Scenario: 4–6 inch recessed downlights with thermally constrained aluminum housings requiring active thermal management. IC Role / Device Role / Timing Role: Thermal-aware LED driver implementing +140°C fold-back to reduce output current before reaching +170°C OTP shutdown. Use Value: Extends product lifetime in enclosed fixtures by limiting junction temperature rise - avoids premature lumen depreciation or catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL1678-10BS7-13 | Higher 1.0 A integrated MOSFET (RDS(on) = 10–12 Ω); same 500 V rating and SO-7 package. | Supports up to 10 W output power and 180 mA output current - suitable for higher-lumen retrofit lamps. | Select when higher output power is needed and thermal margin allows increased dissipation in same footprint. |
| AL1678-20BS7-13 | 2.0 A MOSFET (RDS(on) = 5.4–6 Ω); identical control architecture and pinout. | Rated for ≤15 W and 240 mA - targets commercial troffer or panel light applications with larger heatsinking. | Choose for systems requiring >8 W output where board space remains constrained and SO-7 thermal interface is optimized. |
Compared with AL1678-08BS7-13, the -10B and -20B variants retain identical control features and protection schemes but scale MOSFET current capability and conduction loss - enabling direct footprint reuse across 8 W, 10 W, and 15 W LED driver designs without circuit redesign.
Availability
AL1678-08BS7-13 is available at Aetrix Electronics and suitable for retrofit LED lamps, high-voltage DC-DC LED drivers, and general-purpose constant-current sources requiring stable component supply and long-term lifecycle support.
Supply support for AL1678-08BS7-13 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, consumer, and automotive markets.
The AL1678 series belongs to Diodes' high-voltage AC-DC LED driver product line, designed specifically for cost-sensitive, non-isolated buck topologies in mains-powered lighting applications with stringent EMI and thermal constraints.
FAQ
What is the maximum continuous output power supported by AL1678-08BS7-13?
The AL1678-08BS7-13 is rated for ≤8 W output power, limited by its integrated 0.8 A MOSFET and SO-7 package thermal resistance (190°C/W). At 120 mA output current and 15 V minimum output voltage, it delivers stable constant current within thermal limits up to +105°C ambient - verified per Diodes' Recommended Operating Conditions.
Does AL1678-08BS7-13 require an auxiliary winding for VCC supply?
No. The AL1678-08BS7-13 uses an internal valley-detection circuit to derive timing information without an auxiliary winding. Its ultra-low 100 µA static operating current enables direct VCC supply from a simple resistive dropper or small-capacitor-fed network - reducing component count and cost.
How does the thermal fold-back function operate in AL1678-08BS7-13?
At junction temperatures exceeding +140°C, the AL1678-08BS7-13 linearly reduces its internal current-sense reference voltage, thereby lowering output current proportionally. This self-adaptive response prevents thermal runaway while maintaining partial illumination until +170°C OTP triggers latch shutdown - enhancing safety in thermally confined fixtures.
Can AL1678-08BS7-13 be used in isolated flyback topologies?
No. The AL1678-08BS7-13 is designed exclusively for non-isolated buck configurations with single-winding inductors. Its internal MOSFET drain is not rated for transformer-coupled primary-side switching, and its control loop lacks flyback-specific demagnetization detection or optocoupler feedback interfaces.
AL1678-08BS7-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width), 7 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8.5V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- 15V ~ 35V
- Current - Output / Channel:
- 800mA
- Frequency:
- 350kHz
- Dimming:
- No
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 7-SO
AL1678-08BS7-13 FAQ
1.How can I place an order for AL1678-08BS7-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL1678-08BS7-13 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 AL1678-08BS7-13 reliable?
The price and inventory of AL1678-08BS7-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL1678-08BS7-13 is usually 5 days.
3.What payment methods are accepted for AL1678-08BS7-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL1678-08BS7-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL1678-08BS7-13?
AL1678-08BS7-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL1678-08BS7-13 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 AL1678-08BS7-13?
For technical support, including AL1678-08BS7-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL1678-08BS7-13 requirements.
6.How does Aetrix verify that AL1678-08BS7-13 is sourced from the original manufacturer or authorized distributors?
All AL1678-08BS7-13 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 AL1678-08BS7-13 meets industry standards.
7.What is the process for return or replacement of AL1678-08BS7-13?
All AL1678-08BS7-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL1678-08BS7-13, 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 AL1678-08BS7-13 part is unused and in its original packaging.
Return procedure for AL1678-08BS7-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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