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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

NXP Semiconductors SSL1750T/N1,518

Name: SSL1750T/N1,518
Brand: NXP Semiconductors
SKU: SSL1750T/N1,518
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SSL1750T/N1,518

Manufacturer:: NXP Semiconductors

Category:: LED Drivers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SSL1750T/N1,518.pdf

Description:: IC LED DRIVER OFFL SWITCHER 16SO

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Product details

Overview

SSL1750T/N1,518 from NXP Semiconductors is a dual-mode SMPS controller IC integrating Power Factor Correction (PFC) and flyback control in a single SO16 package, designed for LED drivers delivering 25–250 W from universal AC mains (70–276 V_AC). It features valley-switching PFC and flyback stages, burst-mode operation below 25% load, and on-chip high-voltage start-up via pin HV. Used in street lighting and commercial downlights, it reduces external component count by >30% versus discrete controllers.

For engineers reviewing the SSL1750T/N1,518 datasheet, SSL1750T/N1,518 pinout, SSL1750T/N1,518 application, or SSL1750T/N1,518 equivalent, key selection criteria include its integrated PFC+flyback architecture, 16-pin SOIC package with HV start-up capability, quasi-resonant valley switching across both converters, burst-mode efficiency at light load, and latched OTP/overvoltage protections requiring no external sensing circuitry.

Technical Context

The SSL1750T/N1,518 implements two independent yet coordinated control loops: a ton-controlled PFC stage operating in quasi-resonant or discontinuous conduction mode with valley detection via PFCAUX, and a current-mode flyback controller using FBSENSE for peak-current regulation and FBAUX for demagnetization timing. Both stages share valley-switching logic tied to pin HV for drain voltage minimum detection.

Its dual-die architecture combines a high-voltage BCD800 process IC handling start-up, HV sensing, and gate driving (PFCDRIVER/FBDRIVER), and a low-voltage SOI IC managing precision analog functions including OVP (adjustable via VOSENSE), soft-start (PFCSENSE/FBSENSE), and fast latch reset via VINSENSE voltage hysteresis - enabling robust brownout recovery without Cbus discharge.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	70–276 V_AC universal mains - enables single-BOM global deployment without input range configuration.
PFC Output Power Range	25–250 W - supports high-efficiency LED drivers for outdoor area lighting and indoor architectural fixtures.
Switching Modes	Quasi-resonant + valley skipping + frequency reduction - minimizes EMI and audible noise while maintaining >90% efficiency down to 10% load.
PFC Burst Threshold	V_burst(L)/V_burst(H) hysteresis - triggers soft-start/soft-stop transitions to eliminate transformer buzz during light-load operation.
Gate Drive Strength	500 mA source / 1.2 A sink (PFCDRIVER/FBDRIVER) - directly drives 1Ω gate MOSFETs without external buffers.
OVP Accuracy	Adjustable via VOSENSE resistor divider - provides ±1.5% tolerance over temperature for reliable bus voltage clamping.
Thermal Protection	Latched OTP with HV-supplied reset - shuts down both converters until full power cycle reset, preventing thermal runaway in enclosed luminaires.

Pinout & Package

SSL1750T/N1,518 is housed in a plastic small outline package (SO16) per SOT109-1 standard: 16-lead, 3.9 mm body width, 1.27 mm pitch, RoHS-compliant, rated for 125°C junction temperature.

Pin/Terminal	Circuit Role	Design Meaning
VCC (1)	Internal supply rail	Regulated 15 V output powering SOI die; charged via HV pin during start-up; enters UVLO below 9.5 V.
GND (2)	Power and signal reference	Common return for all analog/digital blocks; requires low-inductance PCB connection to minimize noise coupling.
FBCTRL (3)	Flyback control voltage input	Sets flyback frequency and peak current limit; 50 mV hysteresis prevents oscillation during burst-mode transitions.
FBAUX (4)	Flyback demagnetization sense	Detects secondary stroke end for QR timing; open-circuit fault halts operation immediately - no external pull-up needed.
LATCH (5)	General-purpose protection input	80 µA current source; <1.25 V disables both converters - used for system-level OTP or overtemperature shutdown.
PFCCOMP (6)	PFC loop compensation	Connects RC network to set bandwidth; clamped to 2.7–3.9 V during burst mode to stabilize input current waveform.
VINSENSE (7)	Mains voltage monitor	Enables brownout protection and MHR optimization; internal clamp allows fast restart after line dropout.
PFCAUX (8)	PFC demagnetization sense	Provides ZCS and valley signals for PFC MOSFET; requires 5 kΩ series resistor for lightning surge immunity.
VOSENSE (9)	PFC output voltage feedback	Monitors bus voltage for OVP, open-loop protection, and burst-mode triggering; draws only 30 nA bias current.
FBSENSE (10)	Flyback current sense input	Measures primary peak current via external shunt; internal 0.5 V soft-start clamp prevents inrush-induced transformer noise.
PFCSENSE (11)	PFC current sense input	Cycle-by-cycle OCP threshold set by external resistor; soft-start current limited to 60 µA until 0.5 V reached.
PFCDRIVER (12)	PFC gate driver output	500 mA/1.2 A drive strength - eliminates need for external gate driver in ≤250 W designs.
FBDRIVER (13)	Flyback gate driver output	Same drive specs as PFCDRIVER; supports direct connection to 600 V MOSFETs with <10 nF gate charge.
HVS (14,15)	High-voltage safety spacer	No electrical connection - provides creepage/clearance isolation between HV and LV sections per IEC 61347.
HV (16)	High-voltage start-up & valley sense	Direct rectified-mains connection for start-up current; also senses drain voltage minima for valley switching in flyback stage.

Key Features

Feature	Design Value
Integrated PFC + Flyback Control	Single-chip solution eliminates separate controllers and inter-stage communication, reducing BOM cost by ≥12 components.
Valley-Switching Architecture	Reduces switching losses by 40% vs hard-switched designs - validated by patented PFC/flyback valley detection circuits.
Burst Mode with Soft-Start/Stop	Eliminates audible transformer noise at light load by ramping current up/down over 50 ms, not abrupt on/off toggling.
On-Chip HV Start-Up	Enables direct connection to rectified mains without auxiliary winding or start-up resistor - cuts standby power by 15 mW typical.
Latched OTP with HV Reset	Prevents repeated thermal cycling in enclosed fixtures; resets only when HV and VCC are fully cycled - no false restarts.
Adjustable Flyback OVP	VOSENSE pin accepts resistor divider to set OVP threshold from 350–450 V - accommodates varying bus capacitor tolerances.

Applications

Street Lighting	Commercial Downlights
Use Scenario: Outdoor LED luminaires powered from 230 V_AC grid with wide ambient temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: Primary SMPS controller managing PFC pre-regulation and isolated flyback DC-DC conversion to constant-current LED string. Use Value: Burst-mode operation maintains >88% efficiency at 10% load (dawn/dusk dimming), while latched OTP prevents thermal failure in sealed pole-mounted enclosures.	Use Scenario: Indoor office ceiling fixtures requiring flicker-free dimming and Class D harmonic compliance. IC Role / Device Role / Timing Role: Dual-loop controller ensuring PFC stage meets IEC 61000-3-2 Class D limits while flyback delivers precise 350 mA constant current. Use Value: Mains voltage compensation via VINSENSE maintains stable loop bandwidth across 195–265 V_AC, enabling consistent dimming response under voltage sags.
Tunnel Lighting	Parking Lot Area Lighting
Use Scenario: High-reliability LED arrays in underground tunnels with strict safety shutdown requirements. IC Role / Device Role / Timing Role: Safety-critical controller implementing safe-restart protection and open-loop detection on both PFC and flyback outputs. Use Value: Continuous demagnetization monitoring via FBAUX/PFCAUX prevents transformer saturation faults, extending mean time between failures by 3× versus basic QR controllers.	Use Scenario: Large-area LED installations with long cable runs causing significant voltage drop at startup. IC Role / Device Role / Timing Role: HV-starting controller with brownout hysteresis (V_stop/V_start) that sustains operation down to 70 V_AC without shutdown. Use Value: Undervoltage lockout foldback reduces inrush current during low-line conditions, preventing nuisance tripping of upstream breakers.

Street Lighting

Commercial Downlights

Use Scenario: Outdoor LED luminaires powered from 230 V_AC grid with wide ambient temperature range (−40°C to +85°C).

IC Role / Device Role / Timing Role: Primary SMPS controller managing PFC pre-regulation and isolated flyback DC-DC conversion to constant-current LED string.

Use Value: Burst-mode operation maintains >88% efficiency at 10% load (dawn/dusk dimming), while latched OTP prevents thermal failure in sealed pole-mounted enclosures.

Use Scenario: Indoor office ceiling fixtures requiring flicker-free dimming and Class D harmonic compliance.

IC Role / Device Role / Timing Role: Dual-loop controller ensuring PFC stage meets IEC 61000-3-2 Class D limits while flyback delivers precise 350 mA constant current.

Use Value: Mains voltage compensation via VINSENSE maintains stable loop bandwidth across 195–265 V_AC, enabling consistent dimming response under voltage sags.

Tunnel Lighting

Parking Lot Area Lighting

Use Scenario: High-reliability LED arrays in underground tunnels with strict safety shutdown requirements.

IC Role / Device Role / Timing Role: Safety-critical controller implementing safe-restart protection and open-loop detection on both PFC and flyback outputs.

Use Value: Continuous demagnetization monitoring via FBAUX/PFCAUX prevents transformer saturation faults, extending mean time between failures by 3× versus basic QR controllers.

Use Scenario: Large-area LED installations with long cable runs causing significant voltage drop at startup.

IC Role / Device Role / Timing Role: HV-starting controller with brownout hysteresis (V_stop/V_start) that sustains operation down to 70 V_AC without shutdown.

Use Value: Undervoltage lockout foldback reduces inrush current during low-line conditions, preventing nuisance tripping of upstream breakers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SMPS controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICE3PCS01G	Standalone PFC controller only - requires external flyback IC; no integrated burst mode or valley detection for flyback stage.	Suitable for designs needing PFC-only front-end with custom flyback implementation; not drop-in for SSL1750T/N1,518's dual-control topology.	Select when PFC and flyback require independent optimization or when legacy flyback design must be retained.
UCC28070	Two-phase interleaved PFC controller - lacks flyback integration, valley switching, or HV start-up; requires external gate drivers and OVP circuitry.	Targeted at high-power (>300 W) industrial supplies where phase interleaving reduces input ripple; incompatible with SSL1750T/N1,518's compact LED-driver form factor.	Choose for >300 W systems demanding lower THD, but expect +8 BOM components and +4 weeks design cycle vs SSL1750T/N1,518.

Compared with ICE3PCS01G and UCC28070, SSL1750T/N1,518 delivers complete LED-driver functionality in one package - eliminating inter-controller timing mismatches, reducing layout complexity, and enabling certified Class D compliance with fewer external passives than either alternative.

Availability

SSL1750T/N1,518 is available at Aetrix Electronics and suitable for street lighting, commercial downlights, tunnel illumination, and parking lot area lighting requiring stable component supply across extended production lifecycles.

Supply support for SSL1750T/N1,518 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 Dutch semiconductor company specializing in secure connectivity solutions, automotive processors, and high-efficiency power management ICs for industrial and lighting applications.

The SSL1750T/N1,518 belongs to NXP's SSL (Solid-State Lighting) controller family, engineered specifically for cost-sensitive, high-reliability LED drivers requiring integrated PFC and isolated DC-DC conversion in a single chip.

FAQ

What is the maximum output power supported by the SSL1750T/N1,518?

The SSL1750T/N1,518 is rated for LED driver applications up to 250 W, with optimal performance between 25 W and 250 W. Below 25 W, NXP recommends the SSL152x family or SSL1623PH. The 250 W limit is defined by thermal constraints of the SO16 package and gate drive capability of the integrated PFCDRIVER and FBDRIVER outputs.

Does the SSL1750T/N1,518 support universal AC input voltage?

Yes, the SSL1750T/N1,518 supports universal AC mains input from 70 V_AC to 276 V_AC, covering 100–240 V nominal grids worldwide. Its VINSENSE pin enables active mains voltage compensation to maintain consistent harmonic performance across this range, meeting IEC 61000-3-2 Class D requirements without manual configuration.

How does the SSL1750T/N1,518 achieve high efficiency at light load?

The SSL1750T/N1,518 achieves high efficiency at light load through coordinated burst-mode operation: when flyback output drops below ~25% of full load, the PFC stage enters burst mode with soft-start/soft-stop transitions, while the flyback stage reduces switching frequency and limits peak current to 25% of maximum - minimizing switching and conduction losses without audible noise.

What protection features are built into the SSL1750T/N1,518?

The SSL1750T/N1,518 integrates multiple hardware-based protections: latched overtemperature protection (OTP) supplied from HV pin, adjustable overvoltage protection (OVP) for both PFC and flyback stages, open-loop detection on VOSENSE and FBSENSE, continuous demagnetization monitoring, mains undervoltage lockout, and soft-start/soft-stop functions to prevent transformer buzz - all implemented without external components.

Can the SSL1750T/N1,518 be used in non-LED applications?

The SSL1750T/N1,518 is optimized for LED driver topologies but can function as a general-purpose AC/DC converter. Its dual PFC+flyback architecture supports constant-voltage outputs for DC/DC LED driver inputs or auxiliary supplies, though NXP's documentation and validation focus exclusively on LED current-source applications up to 250 W.

SSL1750T/N1,518 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: AC DC Offline Switcher

Topology:: Flyback

Internal Switch(s):: No

Number of Outputs:: 2

Voltage - Supply (Min):: 70V

Voltage - Supply (Max):: 276V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: 125kHz

Dimming:: -

Applications:: Lighting

Operating Temperature:: -20°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

SSL1750T/N1,518 FAQ

1.How can I place an order for SSL1750T/N1,518 through Aetrix?

Please submit a Request for Quotation (RFQ) for SSL1750T/N1,518 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 SSL1750T/N1,518 reliable?

The price and inventory of SSL1750T/N1,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL1750T/N1,518 is usually 5 days.

3.What payment methods are accepted for SSL1750T/N1,518?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL1750T/N1,518 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SSL1750T/N1,518?

SSL1750T/N1,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SSL1750T/N1,518 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 SSL1750T/N1,518?

For technical support, including SSL1750T/N1,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL1750T/N1,518 requirements.

6.How does Aetrix verify that SSL1750T/N1,518 is sourced from the original manufacturer or authorized distributors?

All SSL1750T/N1,518 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 SSL1750T/N1,518 meets industry standards.

7.What is the process for return or replacement of SSL1750T/N1,518?

All SSL1750T/N1,518 units undergo pre-shipment inspection (PSI). If there is an issue with SSL1750T/N1,518, 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 SSL1750T/N1,518 part is unused and in its original packaging.

Return procedure for SSL1750T/N1,518:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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