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NXP Semiconductors SSL2109AT/1,118
- Part No.:
- SSL2109AT/1,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SSL2109AT/1,118.pdf
- Description:
- IC LED DRIVER OFFL SWITCHER 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,641
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Product details
Overview
SSL2109AT/1,118 from NXP Semiconductors is a high-voltage LED driver IC designed for non-dimmable, fixed-current LED lamp applications operating directly from rectified mains (100 V, 120 V, or 230 V AC). It supports buck, buck/boost, and flyback topologies in Boundary Conduction Mode (BCM), delivers ±5 % LED current accuracy, and achieves up to 95 % efficiency with power factor >0.9 in optimized designs.
For engineers reviewing the SSL2109AT/1,118 datasheet, SSL2109AT/1,118 pinout, SSL2109AT/1,118 application, or SSL2109AT/1,118 equivalent, this page provides verified technical context, validated pin functions, topology-specific design meaning of key specs, real-world protection behavior, and two confirmed alternative drivers for retrofit LED lamp development.
Technical Context
The SSL2109AT/1,118 implements a peak-current-controlled BCM converter with internal valley detection on the DRAIN pin to enable zero-voltage switching, reducing capacitive losses. Its driver output (DRIVER pin) delivers up to −0.195 A sink and +0.28 A source current to drive an external MOSFET in high-side or low-side configurations.
Startup is enabled by an internal HV current source (350 μA typical at 100 V), followed by dV/dt supply via the DVDT pin; VCC regulation includes hysteresis (VCC(startup) = 12 V typ., VCC(stop) = 9 V typ.) and an auxiliary regulator activated below 9.25 V. Protection includes latched OSP, safe-restart OTP (Tth(act)otp = 170 °C), OCP with 300 ns LEB, and brownout limiting via ton(high) = 15 μs max.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology Support | Buck, buck/boost, flyback - enables single-inductor non-isolated designs or transformer-coupled isolation without redesigning control logic |
| Conversion Frequency | 100 kHz nominal - sets minimum inductor size and EMI filter requirements; fixed-frequency operation simplifies EMI compliance |
| LED Current Accuracy | ±5 % - ensures consistent luminous output across production units and line/load variations without trimming |
| VCC Operating Range | 8–16 V - compatible with standard 12 V bias rails and tolerates ripple from dV/dt supply without external regulators |
| Driver Output Voltage | 9–12 V (Vo(DRIVER)max) - sufficient gate drive for 600 V external MOSFETs with margin for Miller plateau crossing |
| Valley Detection Threshold | ΔVvrec(min) = 20 V - ensures reliable valley switching even under transformer leakage-induced ringing in flyback mode |
| OCP Threshold | 500 mV on SOURCE pin - sets peak primary current; combined with sense resistor defines precise LED current (ILED ≈ 0.5 × Ipk) |
Pinout & Package
SSL2109AT/1,118 is housed in an SO8 package (SOT96-1), 3.9 mm body width, 1.27 mm pitch, with 159 K/W junction-to-ambient thermal resistance on a 2-layer 2 cm × 3 cm PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HV | High-voltage startup supply | Connects to rectified mains; powers internal current source during startup until dV/dt supply takes over |
| VCC | Internal supply rail | Regulated 8–16 V input; clamped internally; powers logic, driver, and protection circuits |
| NTC | Temperature/PWM control input | Accepts NTC voltage for thermal foldback or digital PWM signal for on/off dimming; internal −47 μA offset current |
| SOURCE | Current sense return | Low-side sensing node for external MOSFET; OCP triggers at 500 mV (typ.), enabling accurate ILED setting |
| DRIVER | External switch gate driver | Push-pull output driving MOSFET gate; 10.5 V max output ensures full enhancement of high-voltage FETs |
| DVDT | dV/dt auxiliary supply input | AC-coupled input for self-powered operation; eliminates need for auxiliary winding or linear regulator |
| GND | Signal and power reference | Common return for all analog and digital circuitry; must be low-impedance to avoid OCP false triggering |
| DRAIN | Valley detection input | Monitors external MOSFET drain for resonant valley; enables ZVS and reduces switching losses in BCM |
Key Features
| Feature | Design Value |
|---|---|
| Boundary Conduction Mode (BCM) control | Enables high efficiency (>95%) and high PF (>0.9) without complex control loops or variable frequency jitter |
| Integrated valley detection | Reduces switching losses by triggering MOSFET turn-on at drain voltage minima; eliminates need for external timing components |
| Driver-only architecture | Supports discrete high-voltage MOSFET selection (e.g., 600 V+), enabling optimization for cost, Rds(on), or thermal performance |
| Latched Output Short Protection (OSP) | Halts operation until power cycle reset - prevents thermal runaway during sustained short-circuit conditions in LED strings |
| NTC-based LED thermal management | Provides gradual current foldback and safe-restart OTP using only one external NTC resistor - matches LED lifetime reliability |
Applications
| LED Retrofit Lamps | Compact AC-DC LED Drivers |
|---|---|
Use Scenario: Direct replacement of incandescent or CFL lamps in E27/E26 sockets with integrated LED modules powered from 100–230 V AC mains. IC Role / Device Role / Timing Role: Primary controller implementing BCM buck topology; regulates fixed LED current independent of input voltage variation. Use Value: Enables <15 mm PCB height and <20 cm² footprint while maintaining >0.9 PF and ±5 % current accuracy across universal input range. |
Use Scenario: Standalone LED driver board for commercial downlights or panel lights requiring high efficiency and low BOM count. IC Role / Device Role / Timing Role: Driver-only controller managing external MOSFET in flyback configuration; handles valley-synchronized switching and brownout response. Use Value: Eliminates need for optocoupler or secondary-side feedback, reducing component count by ≥30% versus isolated controllers with similar PF and THD. |
| Non-Dimmable Streetlight Modules | Thermally Managed LED Tubes |
Use Scenario: Outdoor LED streetlight modules operating continuously at ambient temperatures up to +85 °C with passive heatsinking. IC Role / Device Role / Timing Role: BCM controller with integrated OTP and NTC interface; monitors die temperature and adjusts current before LED junction exceeds rating. Use Value: Extends system lifetime beyond 50,000 hours by preventing LED thermal runaway - IC lifetime matches or exceeds LED lifetime per datasheet claim. |
Use Scenario: T8/T5 LED tube replacements where PCB space is constrained and thermal coupling between LEDs and driver IC is direct. IC Role / Device Role / Timing Role: Dual-function NTC pin used for both soft-start (capacitor-assisted ramp) and real-time thermal foldback during operation. Use Value: Achieves smooth 500 ms soft-start and immediate current reduction when NTC voltage drops below 0.35 V - avoids inrush stress and thermal shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SSL21083T/1,118 | Includes integrated 600 V MOSFET; no external switch required; lower BOM but fixed Rds(on) and thermal path | Better suited for ultra-compact designs where PCB area is more critical than thermal flexibility | Select when minimizing component count outweighs need for discrete MOSFET optimization |
| UCC28810DR | Fixed-frequency CRM controller; no internal valley detection; requires external zero-crossing sensing for ZVS | Designed for higher-power (>30 W) flyback drivers with tighter THD requirements | Select when designing >25 W LED drivers requiring JEDEC-compliant THD and programmable frequency |
Compared with SSL21083T/1,118, the SSL2109AT/1,118 trades integration for thermal and voltage scalability via external MOSFET; compared with UCC28810DR, it offers simpler valley-synchronized startup and lower system-level EMI without auxiliary sensing components.
Availability
SSL2109AT/1,118 is available at Aetrix Electronics and suitable for LED retrofit lamps, compact AC-DC LED drivers, and thermally managed LED tubes requiring stable component supply and long-term lifecycle support.
Supply support for SSL2109AT/1,118 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SSL2109AT/1,118 belongs to NXP's SSL (Smart Lighting Solutions) product line, engineered specifically for cost-sensitive, high-efficiency, non-dimmable LED lighting systems targeting residential and commercial retrofit markets.
FAQ
What topology configurations does the SSL2109AT/1,118 support?
The SSL2109AT/1,118 supports buck, buck/boost, and flyback topologies in Boundary Conduction Mode. Its driver-only architecture and internal valley detection on the DRAIN pin allow flexible implementation across all three - for example, buck for non-isolated lamps, flyback for isolated drivers. The SSL2109AT/1,118 does not require topology-specific configuration pins or external mode-select components.
How does the SSL2109AT/1,118 achieve high power factor without active PFC stages?
The SSL2109AT/1,118 achieves >0.9 power factor through BCM operation synchronized to the AC line voltage waveform, which naturally shapes input current to follow voltage. This eliminates the need for dedicated boost PFC controllers or additional inductors. The SSL2109AT/1,118's valley detection and fixed 100 kHz switching further reduce harmonic distortion, meeting EN61000-3-2 Class C requirements in properly designed layouts.
Can the SSL2109AT/1,118 be used in dimmable applications?
The SSL2109AT/1,118 is explicitly designed for non-dimmable operation and lacks native TRIAC, DALI, or PWM dimming interfaces. While its NTC pin accepts digital PWM signals for on/off control, it does not support analog dimming or phase-cut compatibility. For dimmable designs, NXP recommends the SSL2129AT or SSL21084AT - the SSL2109AT/1,118 is not rated or characterized for dimming functionality.
What protection features are latched versus auto-recovering in the SSL2109AT/1,118?
The SSL2109AT/1,118 implements latched Output Short Protection (OSP), requiring power cycling to reset after fault detection. In contrast, OverTemperature Protection (OTP) and LED overtemperature protection are safe-restart types - the IC halts switching and resumes automatically once temperature falls below Tth(rel)otp (100 °C typ.). Brownout and OCP are cycle-by-cycle protections without latching.
What is the role of the DVDT pin in the SSL2109AT/1,118 supply architecture?
The DVDT pin provides a self-powered dV/dt supply path by rectifying voltage swing from the external MOSFET drain, eliminating the need for auxiliary windings or linear regulators. During normal operation, it supplies current to the VCC rail; at startup, the internal HV current source powers the IC until DVDT becomes active. This dual-supply method improves efficiency and reduces component count - a defining feature of the SSL2109AT/1,118.
SSL2109AT/1,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- GreenChip™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- 600V
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
SSL2109AT/1,118 FAQ
1.How can I place an order for SSL2109AT/1,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL2109AT/1,118 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 SSL2109AT/1,118 reliable?
The price and inventory of SSL2109AT/1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL2109AT/1,118 is usually 5 days.
3.What payment methods are accepted for SSL2109AT/1,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL2109AT/1,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL2109AT/1,118?
SSL2109AT/1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL2109AT/1,118 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 SSL2109AT/1,118?
For technical support, including SSL2109AT/1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL2109AT/1,118 requirements.
6.How does Aetrix verify that SSL2109AT/1,118 is sourced from the original manufacturer or authorized distributors?
All SSL2109AT/1,118 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 SSL2109AT/1,118 meets industry standards.
7.What is the process for return or replacement of SSL2109AT/1,118?
All SSL2109AT/1,118 units undergo pre-shipment inspection (PSI). If there is an issue with SSL2109AT/1,118, 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 SSL2109AT/1,118 part is unused and in its original packaging.
Return procedure for SSL2109AT/1,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL2109AT/1,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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