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Diodes Incorporated AL9910A-5S-13
- Part No.:
- AL9910A-5S-13
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AL9910A-5S-13.pdf
- Description:
- IC LED DRIVER OFFL PWM 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,793
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Product details
Overview
AL9910A-5S-13 from Diodes Incorporated is a high-voltage PWM LED driver-controller designed for offline constant-current LED lighting systems operating directly from rectified AC mains (85–277VAC). It drives external MOSFETs up to 300kHz, delivers 10V gate drive, features 255mV current-sense threshold with ±5% tolerance, and supports both linear (LD pin) and PWM (PWM_D pin) dimming. Used in non-isolated buck LED drivers for commercial lamps and signage.
For engineers reviewing the AL9910A-5S-13 datasheet, AL9910A-5S-13 pinout, AL9910A-5S-13 application, or AL9910A-5S-13 equivalent, key selection criteria include input voltage resilience (500V max), SO-8EP thermal performance (θJA = 66°C/W), 10V VDD regulation, 255mV CS threshold accuracy, and dual-dimming interface compatibility with legacy control circuits.
Technical Context
The AL9910A-5S-13 implements a peak-current-mode controlled buck topology with internal 10V LDO powering gate drive and logic. Its oscillator frequency (20–300kHz) is set by an external ROSC resistor, and it enters constant-off-time mode when ROSC is connected to GATE instead of GND.
Current regulation relies on real-time sensing at the CS pin with 250–280mV threshold (typ. 255mV), blanked for 160–440ns after switching transitions. Thermal shutdown activates at +150°C with +50°C hysteresis, and UVLO engages at 8–10V VDD with 750mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 20V to 500V DC - supports universal rectified AC inputs (85–277VAC) with robust transient immunity. |
| VDD Regulation | 10V nominal (±1V) - powers internal circuitry and supplies ≤1mA to external bias networks. |
| CS Threshold Voltage | 255mV (±5%) - sets LED current via external sense resistor; tighter tolerance than standard AL9910 variants. |
| Gate Drive Voltage | 10V (VDD − 0.3V high, 0.3V low) - ensures full enhancement of standard N-channel MOSFETs in high-side switch configuration. |
| Switching Frequency | 20–300kHz - programmable via ROSC resistor; enables optimization of efficiency, EMI, and inductor size. |
| Thermal Protection | 150°C junction shutdown with 50°C hysteresis - prevents thermal runaway during overload or poor heatsinking. |
| Dimming Interfaces | LD pin (45–250mV analog) + PWM_D pin (0–100% duty, TTL-compatible) - supports simultaneous or independent brightness control. |
Pinout & Package
AL9910A-5S-13 is housed in a thermally enhanced SO-8EP package with exposed pad (EP) electrically connected to GND for improved heat dissipation (θJC = 9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | High-voltage input supply | Accepts 20–500V DC; powers internal LDO and withstands line transients without external clamping. |
| CS (Pin 2) | Current-sense comparator input | Monitors voltage across external RSENSE; triggers MOSFET turn-off when threshold (255mV) is exceeded. |
| GND (Pin 3) | Reference ground | Common return for CS, PWM_D, LD, ROSC, and EP pad; must be low-impedance for stable current regulation. |
| GATE (Pin 4) | External MOSFET gate driver output | Delivers 10V swing with 30–50ns rise/fall times into 500pF load; drives N-channel switch in high-side buck configuration. |
| PWM_D (Pin 5) | Enable/dimming control input | Pull-down enabled (200kΩ); <1V disables IC; >2.4V enables; accepts 0–100% PWM signals up to several kHz. |
| VDD (Pin 6) | Internally regulated supply | 10V output derived from VIN; powers internal logic and gate driver; can source ≤1mA for auxiliary circuitry. |
| LD (Pin 7) | Analog dimming control | Adjusts CS threshold from 45mV to 250mV; enables smooth linear dimming without flicker or audible noise. |
| ROSC (Pin 8) | Oscillator timing input | Resistor-to-GND sets frequency; connecting to GATE forces constant-off-time mode for improved stability at high duty cycles. |
| EP Pad | Thermal and electrical ground | Exposed copper pad under package; must be soldered to PCB GND plane with thermal vias for θJA = 66°C/W operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10V LDO | Eliminates startup resistor; reduces system BOM count and power loss while enabling self-powered operation from high-voltage rail. |
| 5% current-sense tolerance | Ensures ±5% LED current accuracy across temperature and line variations-critical for consistent lumen output in commercial lighting. |
| Dual dimming architecture | Independent LD (analog) and PWM_D (digital) inputs allow hybrid dimming schemes, soft-start via LD capacitor, and flicker-free low-frequency PWM. |
| SO-8EP thermal enhancement | 66°C/W junction-to-ambient thermal resistance enables higher continuous power delivery (2200mW) versus standard SO-8 (630mW). |
| 500V absolute max input rating | Withstands surge events per IEC 61000-4-5 without external TVS, simplifying design for 277VAC industrial and outdoor LED fixtures. |
Applications
| Commercial LED Lamps | Architectural Signage |
|---|---|
|
Use Scenario: Retrofit A19 and PAR30 LED bulbs operating directly from 120/277VAC mains without isolated flyback converters. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current via external MOSFET and sense resistor; sets switching frequency and dimming response timing. Use Value: Enables >90% efficiency and compact form factor by eliminating transformer and secondary-side feedback components. |
Use Scenario: Channel letter and edge-lit signage requiring uniform brightness across long LED strings powered from 277VAC distribution. IC Role / Device Role / Timing Role: High-voltage LED driver with PWM_D input synchronized to building automation DMX or 0–10V control signals. Use Value: Delivers stable current despite wide input voltage swings (200–305VDC rectified), minimizing luminance drift in outdoor environments. |
| Flat Panel Backlighting | Industrial Control Panel Lighting |
|
Use Scenario: Cost-sensitive LCD monitor backlight using 12–24 LED series strings driven from 120VAC input. IC Role / Device Role / Timing Role: Non-isolated buck controller with LD pin enabling analog dimming via microcontroller DAC output. Use Value: Achieves smooth, noiseless dimming down to 1% without PWM-induced EMI or audible coil whine. |
Use Scenario: Operator interface panels in factory automation where LEDs indicate machine status under harsh 240VAC industrial power. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown and 500V input rating ensuring reliability in unregulated plant power environments. Use Value: Maintains LED function during brownouts and surges, reducing field failures and maintenance costs. |
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 |
|---|---|---|---|
| AL9910-5S-13 | 7.5V VDD, 250mV CS threshold, 5% tolerance, SO-8/SO-8EP - lower gate drive voltage limits MOSFET selection. | Suitable for lower-power LED strings (<150mA) where 7.5V gate drive suffices and thermal budget allows SO-8. | Select when cost sensitivity outweighs thermal headroom needs and gate drive margin is acceptable. |
| AL9910A-6S-13 | 10V VDD, 265mV CS threshold, 6% tolerance - looser current accuracy but identical package and pinout. | Better suited for applications where ±6% LED current variation is acceptable (e.g., non-critical indicator lighting). | Choose when tighter current matching is unnecessary and broader production tolerance simplifies sourcing. |
Compared with AL9910A-5S-13, AL9910-5S-13 trades gate drive strength and thermal capability for lower cost, while AL9910A-6S-13 relaxes current accuracy to accommodate wider process variation-making the -5S variant optimal for precision, high-reliability LED lighting where consistent lumen output and thermal margin are critical.
Availability
AL9910A-5S-13 is available at Aetrix Electronics and suitable for commercial LED lamps, architectural signage, flat panel backlighting, and industrial control panel lighting requiring stable component supply and long-term manufacturability.
Supply support for AL9910A-5S-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 AL9910A product line targets high-efficiency, high-voltage LED driver applications-designed specifically to replace magnetic transformers and linear regulators in AC-powered solid-state lighting with minimal external components.
FAQ
What is the minimum input voltage required for AL9910A-5S-13 to start and operate?
The AL9910A-5S-13 requires a minimum DC input voltage of 20V to initiate operation, as specified in its recommended operating conditions. This corresponds to approximately 14.1V RMS AC input before rectification. Below this threshold, the internal LDO cannot regulate VDD to 10V, and the UVLO circuit prevents gate drive activation. Startup occurs reliably above 20V DC, with full regulation maintained up to 500V.
Can AL9910A-5S-13 drive LEDs in an isolated flyback topology?
Yes, the AL9910A-5S-13 supports isolated topologies including flyback, though it is primarily optimized for non-isolated buck configurations. In flyback designs, the IC regulates peak primary current, and energy transfer to the secondary side determines LED current. External optocoupler feedback is not used-the AL9910A-5S-13 relies on primary-side sensing, requiring careful transformer design and compensation to maintain accuracy across line and load variations.
How does the ROSC pin function in constant-off-time mode?
In constant-off-time mode, the ROSC pin is connected to the GATE node instead of GND. This reconfigures the internal oscillator to define the off-time (tOFF) rather than the full switching period. The off-time becomes fixed and inversely proportional to the ROSC resistor value, while on-time varies with input/output voltage ratio. This eliminates sub-harmonic oscillation at high duty cycles (>50%) and improves regulation stability in buck applications with wide VIN/VLED ratios.
What is the role of the exposed pad (EP) in the SO-8EP package?
The exposed pad (EP) in the AL9910A-5S-13's SO-8EP package is electrically connected to GND and serves as the primary thermal conduction path from the die to the PCB. When soldered to a large GND copper area with ≥6 thermal vias, it reduces thermal resistance from junction to ambient to 66°C/W-enabling 2200mW continuous power dissipation. Leaving the EP unconnected or floating degrades thermal performance and risks thermal shutdown under load.
AL9910A-5S-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:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 20V
- Voltage - Supply (Max):
- 500V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 300kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight, Lighting, Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
AL9910A-5S-13 FAQ
1.How can I place an order for AL9910A-5S-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL9910A-5S-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 AL9910A-5S-13 reliable?
The price and inventory of AL9910A-5S-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL9910A-5S-13 is usually 5 days.
3.What payment methods are accepted for AL9910A-5S-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL9910A-5S-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL9910A-5S-13?
AL9910A-5S-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL9910A-5S-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 AL9910A-5S-13?
For technical support, including AL9910A-5S-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL9910A-5S-13 requirements.
6.How does Aetrix verify that AL9910A-5S-13 is sourced from the original manufacturer or authorized distributors?
All AL9910A-5S-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 AL9910A-5S-13 meets industry standards.
7.What is the process for return or replacement of AL9910A-5S-13?
All AL9910A-5S-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL9910A-5S-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 AL9910A-5S-13 part is unused and in its original packaging.
Return procedure for AL9910A-5S-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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