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Diodes Incorporated AL9902FDF-13
- Part No.:
- AL9902FDF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 12-UDFN Exposed Pad
- Datasheet:
-
AL9902FDF-13.pdf
- Description:
- IC LED DRVR OFFL PWM 400MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
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Product details
Overview
AL9902FDF-13 from Diodes Incorporated is a high-voltage linear/PWM dimmable LED driver IC with integrated 650V/2A MOSFET, operating from rectified AC inputs (85–277VAC) or DC (20–500V), delivering constant current up to 180mA with ±5% sense tolerance, 7.5V internal LDO, and fixed-frequency switching up to 300kHz set by ROSC resistor - used in offline LED lamps and signage lighting.
For engineers reviewing the AL9902FDF-13 datasheet, AL9902FDF-13 pinout, AL9902FDF-13 application, or AL9902FDF-13 equivalent, key selection criteria include its integrated high-voltage MOSFET rating (650V VDSS, 4Ω RDS(on)), dual dimming support (LD analog + PWM input), thermal shutdown at 141°C, and compatibility with buck/boost topologies for constant-current LED string control.
Technical Context
The AL9902FDF-13 implements a fixed-frequency current-mode buck controller with internal 650V MOSFET and 7.5V LDO regulator. It senses LED current via CS pin with 250mV threshold and regulates by limiting peak switch current, supporting both discontinuous and continuous conduction modes.
Its oscillator frequency (20–300kHz) is set externally via ROSC resistor; PWM dimming accepts 0–100% duty cycle up to several kHz; LD pin enables linear dimming by scaling the current-sense comparator reference. Internal OTP triggers at 141°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 650V - supports direct connection to rectified 277VAC mains without external HV MOSFET. |
| RDS(on) | 4Ω (typ) - limits conduction loss at 1.6A steady-state drain current, enabling >90% efficiency in buck topology. |
| ILED Accuracy | ±5% - tight current-sense tolerance ensures stable light output across temperature (-40°C to +125°C). |
| fOSC | 20–300kHz - adjustable via ROSC resistor; higher frequencies reduce inductor size but increase switching loss. |
| VDD | 7.5V (±0.3V) - regulated supply powers internal gate driver and supports ≤1mA external load, eliminating startup resistor. |
| TJ(shutdown) | 141°C - thermal protection disables switching until junction cools by 25°C hysteresis, preventing MOSFET failure. |
| Dimming Support | Linear (LD pin, 0–250mV input) and PWM (0–100% duty, kHz-range) - enables flicker-free brightness control in commercial lighting. |
Pinout & Package
AL9902FDF-13 is packaged in thermally enhanced U-DFN6040-12 (3.0mm × 4.0mm, 0.5mm pitch) with two exposed pads: EP1 (drain connection), EP2 (substrate/GND tie). This package delivers θJA = 65°C/W on FR-4 PCB with minimum 25mm × 25mm copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM | Enable & low-frequency PWM input | Active-high enable; accepts 0–100% duty cycle PWM signal up to several kHz; internal 200kΩ pull-down. |
| VDD | Internally regulated supply rail | 7.5V output powering gate driver and logic; supplies ≤1mA to external circuitry; UVLO at 6.7V. |
| LD | Analog dimming control | 0–250mV input scales current-sense threshold linearly; enables smooth analog brightness adjustment. |
| ROSC | Oscillator frequency setting | Resistor to GND sets switching frequency (e.g., 226kΩ → 100kHz); determines inductor sizing and EMI profile. |
| CS | Current sense input | Monitors voltage across external sense resistor; compares to 250mV threshold to regulate LED current. |
| VIN | High-voltage input supply | Accepts 20–500V DC or rectified AC; powers internal LDO and high-side MOSFET drain. |
| GND | Signal and power ground | Reference for CS, LD, PWM; connects to EP2 exposed pad for optimal thermal and electrical grounding. |
| SO | MOSFET source terminal | Source of internal 650V MOSFET; connects to current-sense resistor and inductor return path. |
| SW | MOSFET drain terminal | Drain of internal MOSFET; connects to inductor input in buck topology or transformer primary in flyback. |
| EP1 | Drain thermal pad | Exposed pad 1 ties directly to internal MOSFET drain; must be soldered to large copper area for heat dissipation. |
| EP2 | Substrate/GND thermal pad | Exposed pad 2 connects to IC substrate and GND; requires direct PCB grounding for lowest θJA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 650V/2A MOSFET | Eliminates need for external HV switch in offline LED drivers, reducing BOM count and layout complexity. |
| 7.5V internal LDO | Replaces high-wattage startup resistor; provides stable bias for gate driver and supports auxiliary circuitry. |
| ±5% current sense tolerance | Ensures consistent LED brightness across line voltage, temperature, and unit-to-unit variation without calibration. |
| Dual dimming interface | Independent LD (analog) and PWM pins allow hybrid dimming schemes compatible with legacy 0–10V and digital controllers. |
| Thermal shutdown with hysteresis | 141°C trip + 25°C hysteresis prevents latch-up during overload or poor heatsinking; enables safe auto-recovery. |
Applications
| Offline LED Lamps | Signage & Decorative Lighting |
|---|---|
Use Scenario: Direct AC-line-powered LED retrofit lamps (A19, PAR30) operating from 85–277VAC without isolation transformers. IC Role / Device Role / Timing Role: Constant-current buck controller with integrated HV MOSFET and LDO; regulates LED string current independent of input ripple. Use Value: Enables compact, cost-effective non-isolated designs meeting Energy Star and IEC 61000-3-2 harmonic limits with simple PFC options. |
Use Scenario: Architectural LED strips and channel letters requiring uniform brightness and smooth dimming in commercial spaces. IC Role / Device Role / Timing Role: High-voltage constant-current source with dual dimming; drives medium-power LED strings (30–180mA) from DC bus or rectified line. Use Value: Delivers flicker-free dimming down to 1% using PWM+LD hybrid control while maintaining ±5% current accuracy over temperature. |
| Backlighting for Flat Panels | DC-DC Constant Current Source |
Use Scenario: Edge-lit LCD backlight modules powered from 48V or 100–375V DC industrial supplies. IC Role / Device Role / Timing Role: Boost-mode LED driver (with external inductor/diode) regulating current for white LED strings above input voltage. Use Value: Supports boost topology with <1% current drift across 48V input range; OTP protects against open-circuit LED failure. |
Use Scenario: Industrial sensor illumination, machine vision lighting, or test equipment requiring precise, programmable DC current sources. IC Role / Device Role / Timing Role: Programmable constant-current sink/source (via CS resistor and ROSC) with thermal protection and wide input range. Use Value: Provides stable 20–180mA output from 20–500V input; RSENSE and ROSC allow full design flexibility without microcontroller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL9902SP-13 | Same die, SO-16 package (θJA = 100°C/W vs. 65°C/W); no exposed drain pad; larger footprint. | Better suited for prototyping or lower-power (<1W) designs where thermal constraints are less stringent. | Select when board space allows SO-16 and thermal margin exceeds 25°C above ambient. |
| AL9910BQ-13 | Next-generation variant with improved RDS(on) (3.2Ω), higher fOSC (up to 500kHz), and extended -40°C to +125°C operation. | Enables higher efficiency in compact buck designs and wider ambient temperature deployment. | Choose for new designs targeting >92% efficiency or operation beyond +105°C ambient. |
Compared with AL9902FDF-13, AL9902SP-13 trades thermal performance for ease of hand-soldering and legacy PCB compatibility, while AL9910BQ-13 upgrades MOSFET conduction loss and frequency headroom - making it preferable for high-density or extended-temperature deployments.
Availability
AL9902FDF-13 is available at Aetrix Electronics and suitable for offline LED lamps, signage lighting, flat-panel backlighting, and industrial constant-current source applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AL9902FDF-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 operations.
The AL9902 belongs to Diodes' high-voltage LED driver product line, designed specifically for cost-sensitive, non-isolated AC/DC LED lighting applications requiring integrated MOSFETs and dual dimming capability.
FAQ
What is the maximum input voltage the AL9902FDF-13 can withstand?
The AL9902FDF-13 supports VIN up to +520V absolute maximum, with recommended operating range of 20–500V DC. Its internal 650V MOSFET enables direct connection to rectified 277VAC mains (≈390V peak), making it suitable for universal-input offline LED drivers without external HV switches.
How does the AL9902FDF-13 achieve constant LED current regulation?
It uses peak-current-mode control: the CS pin monitors voltage across an external sense resistor; when that voltage reaches the internal 250mV threshold, the internal MOSFET turns off. The resulting average LED current is set by RSENSE and inductor value, with ±5% tolerance maintained across temperature and line voltage.
Can the AL9902FDF-13 be used in boost topology?
Yes - though optimized for buck, it supports boost configurations by connecting the LED string to VIN and the inductor between SW and LED cathode. Output capacitor and overvoltage protection are required, as open-circuit LED conditions may damage the internal MOSFET due to unclamped inductive kickback.
What thermal considerations apply to the U-DFN6040-12 package?
The U-DFN6040-12 requires direct soldering of EP1 (drain) and EP2 (GND) to large copper areas: EP2 must connect to solid ground plane, EP1 to thermal pad tied to high-current return path. With 25mm × 25mm 1oz copper, θJA is 65°C/W; insufficient copper raises junction temperature, triggering OTP at lower loads.
AL9902FDF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 12-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 20V
- Voltage - Supply (Max):
- 500V
- Voltage - Output:
- -
- Current - Output / Channel:
- 400mA
- Frequency:
- 300kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN6040-12
AL9902FDF-13 FAQ
1.How can I place an order for AL9902FDF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL9902FDF-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 AL9902FDF-13 reliable?
The price and inventory of AL9902FDF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL9902FDF-13 is usually 5 days.
3.What payment methods are accepted for AL9902FDF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL9902FDF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL9902FDF-13?
AL9902FDF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL9902FDF-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 AL9902FDF-13?
For technical support, including AL9902FDF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL9902FDF-13 requirements.
6.How does Aetrix verify that AL9902FDF-13 is sourced from the original manufacturer or authorized distributors?
All AL9902FDF-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 AL9902FDF-13 meets industry standards.
7.What is the process for return or replacement of AL9902FDF-13?
All AL9902FDF-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL9902FDF-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 AL9902FDF-13 part is unused and in its original packaging.
Return procedure for AL9902FDF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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