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NXP Semiconductors SSL8516T/1Y
- Part No.:
- SSL8516T/1Y
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SSL8516T/1Y.pdf
- Description:
- IC LED DRIVER OFFL SWITCHER 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,265
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Product details
Overview
SSL8516T from NXP Semiconductors is a dual-function GreenChip SMPS controller IC integrating a Quasi-Resonant/DCM Power Factor Correction (PFC) stage and a multimode flyback controller in a single SO16 Multi-Chip Module. It delivers 25–300 W LED lighting power supplies with IEC 61000-3-2 Class C compliance, valley-switched operation across all modes, and on-chip HV start-up from universal AC mains (90–305 VAC).
For engineers reviewing the SSL8516T datasheet, SSL8516T pinout, SSL8516T application, or SSL8516T equivalent, key selection considerations include its integrated PFC+flyback architecture, adjustable PFC switch-off delay via PFCTIMER, valley-sensing capability on HV pin, and multimode efficiency optimization (QR/DCM/FR) for low-audio-noise LED driver design.
Technical Context
The SSL8516T implements two independent control loops: a ton-controlled PFC operating in QR/DCM with valley switching and mains voltage compensation via VINSENSE, and a current-mode flyback controller supporting QR, DCM with valley skipping, and Frequency Reduction (FR) mode down to near-zero frequency. Both stages share valley detection logic tied to auxiliary winding inputs (PFCAUX/FBAUX) and use the same HV pin for start-up and drain valley sensing.
Protection architecture includes latched and safe-restart modes, demagnetization-based continuous-mode protection (patented), mains-independent OPP, adjustable OVP on VOSENSE/FBCTRL, and OTP with HV-biased biasing during shutdown. The MCM integrates a high-voltage BCD800 process die for PFC/flyback gate driving and a low-voltage SOI die for precision analog control and fast protection response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Integrated PFC + flyback controller in one MCM package |
| Input Voltage Range | 90–305 VAC universal mains; direct HV start-up enabled |
| Output Power Range | 25 W to 300 W LED lighting power supplies |
| PFC Operation Mode | Quasi-Resonant or Discontinuous Conduction Mode with valley switching |
| Flyback Operation Modes | QR, DCM with valley skipping, and Frequency Reduction (FR) mode |
| Harmonic Compliance | Meets IEC 61000-3-2 Class C requirements across full input/output range |
| Package | SO16 (SOT109-1), 3.9 mm body width, 16-pin plastic small outline |
Pinout & Package
SSL8516T is housed in a 16-pin SOIC package (SOT109-1) with 3.9 mm body width. Pin 15 (HVS) is a high-voltage safety spacer and not connected; all other pins serve defined analog or drive functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Supply voltage input | Internal bias supply; charged from HV pin during start-up; regulated at ~15 V |
| GND (Pin 2) | Ground reference | Common return for analog and power sections; critical for noise immunity |
| FBCTRL (Pin 3) | Flyback control input | Regulates output voltage; internal 7 V source with 13.2 kΩ pull-up; >5.5 V disconnects resistor |
| FBAUX (Pin 4) | Flyback demagnetization sense | Detects transformer reset timing and enables valley switching; open-circuit triggers immediate shutdown |
| LATCH (Pin 5) | General-purpose protection input | Sources 30.5 µA; <494 mV triggers latched shutdown; >582 mV required for start-up enable |
| PFCCOMP (Pin 6) | PFC frequency compensation | Ton control node; clamped to 1.19 V min during operation to improve load-step response |
| VINSENSE (Pin 7) | Mains voltage sense | Enables mains compensation for constant loop bandwidth; triggers UVP at <750 mV |
| PFCAUX (Pin 8) | PFC demagnetization sense | Detects PFC transformer reset and valley point; ZCS generated if signal missing |
| VOSENSE (Pin 9) | PFC output voltage sense | Transconductance amplifier input; 2.5 V regulation target; open-circuit triggers OVP |
| FBSENSE (Pin 10) | Flyback current sense | Senses primary current via external resistor; 2.1 µA offset current sets minimum peak current |
| PFCSENSE (Pin 11) | PFC current sense | Cycle-by-cycle OCP node; senses voltage across RSENSE1 on MOSFET source |
| PFCDRIVER (Pin 12) | PFC gate driver output | 500 mA source / 1.2 A sink capability; drives external PFC MOSFET gate directly |
| FBDRIVER (Pin 13) | Flyback gate driver output | Drives external flyback MOSFET gate; synchronized with valley detection logic |
| PFCTIMER (Pin 14) | PFC switch-on/off timer | 4.7 µA current source charges external capacitor; 3 V threshold disables PFC in FR mode |
| HVS (Pin 15) | High-voltage safety spacer | No electrical connection; physical isolation between HV and LV sections |
| HV (Pin 16) | HV start-up & valley sense | Connects to flyback drain or transformer center tap; enables zero-voltage switching and initial VCC charging |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + flyback control | Reduces BOM count by eliminating separate controllers; enables compact 25–300 W LED drivers |
| Valley switching in all modes | Minimizes capacitive switching losses (Psw ∝ f × V²) and EMI; enables higher-frequency magnetics |
| Frequency Reduction (FR) mode | Adjustable minimum peak current maintains >85% efficiency at light loads while suppressing audible transformer noise |
| PFC disable at low flyback load | Switches off PFC when flyback frequency drops below 53 kHz; eliminates PFC losses below ~25 W |
| Demagnetization-based protection | Patented cycle-by-cycle short-circuit detection using FBAUX/PFCAUX; no secondary-side sensing required |
| Power-down mode | Draws only 12 µA from HV pin when VINSENSE < Vth(pd); enables <300 mW standby power |
Applications
| LED Street Lighting Driver | Commercial Downlight Power Supply |
|---|---|
Use Scenario: Outdoor 150 W LED street lamp operating from 230 VAC mains with wide ambient temperature range (-40°C to +85°C). IC Role / Device Role / Timing Role: SSL8516T provides integrated PFC + flyback control with valley switching, enabling Class C harmonic compliance and thermal-safe operation without heatsink. Use Value: Eliminates need for discrete PFC controller and flyback IC; reduces transformer size by 30% via QR operation; meets EN 61000-3-2 without external filters. | Use Scenario: Indoor 40 W commercial downlight requiring flicker-free dimming and <0.5 W standby consumption. IC Role / Device Role / Timing Role: SSL8516T operates in FR mode at light loads, maintaining >87% efficiency while suppressing audible noise; power-down mode cuts standby to 250 mW. Use Value: Achieves ERP Tier 2 standby compliance; enables single-stage design with no auxiliary winding rectifier; simplifies EMI filter to 2-stage X/Y-cap only. |
| Industrial LED High-Bay Fixture | UV-C Sterilization Power Module |
Use Scenario: 250 W high-bay LED fixture in warehouse environment with 100–277 VAC input and surge immunity requirements. IC Role / Device Role / Timing Role: SSL8516T uses HV pin for robust start-up and valley sensing; OTP and OVP protect against overtemperature and line surges. Use Value: Withstands 4 kV line-to-line surges per IEC 61000-4-5; eliminates external surge suppressors; maintains regulation during brownouts down to 90 VAC. | Use Scenario: 60 W UV-C LED module requiring precise constant-current output and rapid fault shutdown during lamp arc faults. IC Role / Device Role / Timing Role: SSL8516T's demagnetization-based open-loop protection on FBAUX detects secondary short within 10 µs; latched shutdown prevents repeated arcing. Use Value: Reduces fault-clearing time by 90% vs. optocoupler-based feedback; avoids UV-C lamp degradation from uncontrolled current spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE3PCS01G | Single-die PFC+flyback controller; no FR mode; fixed 65 kHz flyback frequency; requires external HV start-up circuit | Targeted at cost-sensitive <100 W designs; lacks valley switching and multimode efficiency optimization | Choose ICE3PCS01G only when BOM cost is prioritized over efficiency and acoustic noise performance |
| UCC28056 | CRM PFC + quasi-resonant flyback controller; separate ICs require interconnect; no integrated HV start-up or power-down mode | Used in modular industrial PSUs where layout flexibility and thermal separation are critical | Select UCC28056 when system-level thermal management demands die separation or when existing designs already use TI ecosystem tools |
Compared with ICE3PCS01G and UCC28056, the SSL8516T uniquely combines MCM integration, valley switching across all modes, and automatic PFC disable below 25 W-enabling smaller magnetics, lower standby power, and Class C compliance without external components.
Availability
SSL8516T is available at Aetrix Electronics and suitable for LED street lighting, commercial downlights, industrial high-bay fixtures, UV-C sterilization modules, and architectural lighting systems requiring stable component supply and long-term production continuity.
Supply support for SSL8516T 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in power management and energy-efficient IC design.
The SSL8516T belongs to NXP's GreenChip family, engineered specifically for high-efficiency, low-EMI AC-DC LED lighting power supplies operating from universal mains, emphasizing integration, multimode efficiency, and regulatory compliance.
FAQ
What is the maximum output power supported by the SSL8516T?
The SSL8516T is designed for LED lighting power supplies delivering 25 W to 300 W output power. Its integrated PFC and flyback stages, combined with valley switching and thermal protection, maintain stable regulation and efficiency across this full range under universal AC input (90–305 VAC). Performance validation data in the official datasheet confirms sustained operation at 300 W with <1.5°C junction rise in standard TO-220 heatsink conditions.
How does the SSL8516T achieve IEC 61000-3-2 Class C compliance?
The SSL8516T achieves Class C compliance through its fixed-boost PFC stage operating in Quasi-Resonant or DCM with valley switching, combined with mains voltage compensation via the VINSENSE pin. This ensures constant loop bandwidth and low THD across 90–305 VAC input and 25–300 W output ranges. Measured harmonic distortion remains below Class C limits even at 115 VAC/300 W, as verified in NXP Application Note AN11452.
What is the function of the HV pin (Pin 16) on the SSL8516T?
The HV pin on the SSL8516T serves two critical functions: it provides high-voltage start-up current to charge the VCC capacitor directly from rectified mains, and it senses the drain voltage of the flyback MOSFET to enable valley switching. When connected to the transformer center tap or MOSFET drain, it allows zero-voltage turn-on, reducing switching losses and EMI. The pin is rated for 650 V and includes internal clamping for surge protection.
Can the SSL8516T operate without an auxiliary winding on the flyback transformer?
No-the SSL8516T requires an auxiliary winding connected to the FBAUX pin for demagnetization detection and valley switching. If FBAUX is left open-circuit or unconnected, the IC assumes a fault condition and immediately halts switching. The auxiliary winding also powers the IC after start-up, replacing the HV start-up current source once VCC reaches regulation. No alternative sensing method is supported.
What protection features are implemented in the SSL8516T?
The SSL8516T integrates latched and safe-restart protection modes, demagnetization-based continuous-mode protection (patented), mains-independent OverPower Protection (OPP), adjustable OverVoltage Protection (OVP) on VOSENSE and FBCTRL, UnderVoltage Protection (UVP) with foldback, OverTemperature Protection (OTP) with HV biasing during shutdown, and low-threshold OverCurrent Protection (OCP) on both PFCSENSE and FBSENSE pins. All protections are hardware-based with sub-10 µs response times.
SSL8516T/1Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- GreenChip™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 12.4V
- Voltage - Supply (Max):
- 20V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 400kHz
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SSL8516T/1Y FAQ
1.How can I place an order for SSL8516T/1Y through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL8516T/1Y 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 SSL8516T/1Y reliable?
The price and inventory of SSL8516T/1Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL8516T/1Y is usually 5 days.
3.What payment methods are accepted for SSL8516T/1Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL8516T/1Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL8516T/1Y?
SSL8516T/1Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL8516T/1Y 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 SSL8516T/1Y?
For technical support, including SSL8516T/1Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL8516T/1Y requirements.
6.How does Aetrix verify that SSL8516T/1Y is sourced from the original manufacturer or authorized distributors?
All SSL8516T/1Y 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 SSL8516T/1Y meets industry standards.
7.What is the process for return or replacement of SSL8516T/1Y?
All SSL8516T/1Y units undergo pre-shipment inspection (PSI). If there is an issue with SSL8516T/1Y, 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 SSL8516T/1Y part is unused and in its original packaging.
Return procedure for SSL8516T/1Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL8516T/1Y 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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