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NXP Semiconductors SSL3401HN/1Y
- Part No.:
- SSL3401HN/1Y
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
SSL3401HN/1Y.pdf
- Description:
- IC LED DRIVER OFFL 32HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,213
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Product details
Overview
SSL3401HN/1Y from NXP Semiconductors is a low-voltage dimmable SMPS controller IC designed for LED lighting systems operating with phase-cut dimmers and 12 V AC/DC transformers. It integrates a hysteretic boost controller, dual PI feedback loops, 0.052% resolution PWM generation, and comprehensive protection including OVP, SLED, OLED, CCL, UVLO, and adaptive OTP. It delivers stable LED current down to <5% dimming level in MR16/AR111 applications.
For engineers reviewing the SSL3401HN/1Y datasheet, SSL3401HN/1Y pinout, SSL3401HN/1Y application, or SSL3401HN/1Y equivalent, this page provides verified technical context, validated pin functions, confirmed dimming performance across 50/60 Hz and DC supplies, exact package mapping to HVQFN33 (5 × 5 × 0.85 mm), and two rigorously cross-checked alternative controllers for low-voltage LED driver designs.
Technical Context
The SSL3401HN/1Y implements a hysteretic boost converter control architecture with three independent PI controllers: one regulating coil current via ACMPREF, one adjusting LEDPWM duty cycle based on dimmer conduction angle, and one driving LOADPWM for line rejection enhancement. Its automatic supply frequency detection enables seamless operation with 50 Hz, 60 Hz, or DC inputs without configuration.
It features embedded dimmer conduction angle detection, adaptive overtemperature roll-back (with junction temperature sensing every 8.3–10 ms), and dual-level comparator hysteresis selectable via HYSTSET pin (±10 mV or ±20 mV). Protection circuits operate autonomously: OVP triggers at 1.90 V with 0.55 V hysteresis on OVP pin; short-LED detection activates after >500 ms at FB > 2.4 V; OTP threshold is externally programmable from 107.5 °C to 130.0 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.6–3.6 V on both VDD and VDD(IO); dual-supply architecture isolates core logic from I/O domain |
| PWM switching frequency | 12.5 kHz; fixed-frequency LED current modulation synchronized to dimmer phase for flicker-free dimming |
| Dimming range | 100 % to <5 %; enabled by 0.052 % PWM resolution and dual PI loop stability |
| OVP threshold | 1.90 V on OVP pin with 0.55 V hysteresis; disables boost converter immediately upon overvoltage event |
| OTP threshold | Programmable from 107.5 °C to 130.0 °C via external resistor divider on PARAMSET pin |
| Ambient temp. range | 0–105 °C operating; supports enclosed luminaire environments without forced cooling |
| Short-LED detection | Triggers if FB voltage exceeds 2.4 V for >500 ms; shuts down LEDPWM and disables boost |
Pinout & Package
HVQFN33 package: plastic thermal-enhanced very thin quad flat package, 32 terminals, body size 5 × 5 × 0.85 mm, exposed die pad (VSS) for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDD(IO) | Dual power supply inputs | Separate 3.3 V supplies for core logic (VDD) and I/O interface (VDD(IO)); must be externally connected |
| HYSTSET | Hysteresis configuration input | Selects ±10 mV (LOW) or ±20 mV (HIGH/open) comparator hysteresis for noise-immune current sensing |
| LEDPWM | LED current control output | 12.5 kHz PWM signal; LOW = max LED current, HIGH = min LED current; duty cycle set by dimmer conduction angle |
| BSTDRVA / BSTDRVB | Boost MOSFET gate drivers | High-current outputs (±45 mA short-circuit capability) for external inverting MOSFET drivers in boost stage |
| FB | Feedback loop input | Monitors minimum voltage over AC cycle (10 ms/8.3 ms window); reference setpoint = 0.625 V for PI error calculation |
| OVP | Overvoltage sense input | Direct connection to boost output via resistive divider; triggers protection at 1.90 V with 0.55 V hysteresis |
| RESET | Asynchronous reset input | Active-LOW; forces chip into reset state, clearing all registers and disabling all outputs |
| VSS | Digital ground / thermal pad | Exposed die pad; must be soldered to PCB ground plane for thermal management and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Automatic supply detection | Identifies 50 Hz, 60 Hz, or DC input during initialization-no manual configuration required |
| Dual PI controllers | One for coil current regulation (ACMPREF), one for LEDPWM duty cycle-enables tight line regulation & dimming stability |
| Deep-dimming LEDSDWN output | Separate control signal for deep-dimming mode below 5 %; improves low-end linearity and reduces flicker |
| Programmable OTP threshold | Configurable from 107.5 °C to 130.0 °C using external resistor divider on PARAMSET pin |
| Latching input current setting | Adjustable latching peak current (0–2.5 A) via external resistor divider on ILATCHSETACT pin for leading-edge dimmer compatibility |
Applications
| MR16 LED Retrofit Lamps | AR111 Architectural Lighting |
|---|---|
Use Scenario: Replacement of halogen MR16 lamps in existing 12 V AC magnetic transformer infrastructure with phase-cut wall dimmers. IC Role / Device Role / Timing Role: SSL3401HN/1Y acts as the primary SMPS controller, detecting dimmer conduction angle and generating precise LED current PWM while managing boost converter dynamics. Use Value: Enables flicker-free dimming from 100 % to <5 % without modifying legacy dimmer or transformer-no additional EMI filtering required. |
Use Scenario: High-CRI directional lighting in museums and retail displays using 12 V electronic low-voltage transformers. IC Role / Device Role / Timing Role: SSL3401HN/1Y regulates LED string current with dual PI loops and adaptive OTP, maintaining color consistency under thermal stress. Use Value: Maintains ±1.5 % LED current stability across 0–105 °C ambient and 50/60 Hz line frequencies-critical for calibrated lighting environments. |
| Low-Voltage Track Lighting | Dimmable Landscape Lighting |
Use Scenario: Multi-head track systems powered by centralized 12 V AC transformers with trailing-edge dimmers. IC Role / Device Role / Timing Role: SSL3401HN/1Y performs real-time coil current limitation and open-LED detection per head, preventing cascade failure. Use Value: Eliminates need for individual current-setting resistors-each SSL3401HN/1Y self-calibrates during power-up using internal DAC/ADC. |
Use Scenario: Outdoor 12 V DC landscape lighting powered by solar-charged batteries with PWM dimming control. IC Role / Device Role / Timing Role: SSL3401HN/1Y operates in DC mode with continuous LOW LEDPWM for full brightness, and uses UVLO + OTP for battery-low and thermal shutdown. Use Value: Supports true DC operation without external frequency injection-enables silent, transformerless outdoor LED systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-voltage dimmable LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCL30160DR2G | Fixed-frequency buck controller; no dimmer phase detection; requires external zero-crossing circuit for phase-cut compatibility | Limited to basic on/off or analog dimming; cannot replicate SSL3401HN/1Y's <5 % deep-dimming curve or automatic AC/DC detection | Choose for cost-sensitive non-dimming or 0–10 V dimming systems where phase-cut support is not required |
| IRS2541PBF | Single PI loop; no embedded dimmer angle detector; relies on external RC network for dimming response | Requires external components for 50/60 Hz detection and lacks programmable OTP-reduced thermal robustness in enclosed fixtures | Choose when retrofitting legacy magnetic transformers with minimal BOM change, accepting reduced dimming linearity below 10 % |
Compared with NCL30160DR2G and IRS2541PBF, the SSL3401HN/1Y uniquely integrates dimmer conduction angle detection, dual PI control, and programmable OTP-delivering superior dimming fidelity, thermal resilience, and drop-in compatibility with existing low-voltage AC infrastructure without external timing components.
Availability
SSL3401HN/1Y is available at Aetrix Electronics and suitable for MR16 retrofit lamps, AR111 architectural lighting, and low-voltage track lighting requiring stable component supply, long-term BOM continuity, and compliance with IEC 62384 and EN 61000-3-2 Class C standards.
Supply support for SSL3401HN/1Y 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in power management and lighting control ICs.
The SSL3401HN/1Y belongs to NXP's SSL (Smart Solid-State Lighting) product line, engineered specifically for high-fidelity, transformer-compatible LED drivers in residential and commercial low-voltage lighting systems.
FAQ
What is the function of the HYSTSET pin on the SSL3401HN/1Y?
The HYSTSET pin on the SSL3401HN/1Y selects the hysteresis level of the internal comparator used for coil current sensing: when left open or driven HIGH, it configures ±20 mV hysteresis; when driven LOW, it sets ±10 mV. This adjustment optimizes noise immunity versus current-sensing resolution depending on PCB layout and transformer EMI conditions. The SSL3401HN/1Y uses this hysteresis to stabilize the hysteretic boost converter's switching behavior across varying input conditions.
Does the SSL3401HN/1Y support both leading-edge and trailing-edge dimmers?
Yes, the SSL3401HN/1Y supports both leading-edge (TRIAC) and trailing-edge (electronic) dimmers through its embedded dimmer conduction angle detector and configurable latching input current. By setting the ILATCHSETACT pin with an external resistor divider, latching current can be adjusted from 0 A to 2.5 A-enabling reliable start-up and smooth dimming with either dimmer type. The SSL3401HN/1Y automatically adapts its sampling window and PWM response accordingly.
How does the SSL3401HN/1Y handle open-LED fault conditions?
The SSL3401HN/1Y detects open-LED faults indirectly via overvoltage protection: when the LED string opens, the boost output voltage rises until the OVP circuit triggers at 1.90 V on the OVP pin, disabling the boost converter and freezing LEDPWM. Recovery requires either a power cycle or assertion of the RESET pin. This method avoids dedicated open-LED sensing circuitry while ensuring fail-safe shutdown. The SSL3401HN/1Y relies on this OVP-based mechanism as its primary open-LED protection strategy.
Can the SSL3401HN/1Y operate from a pure DC input source?
Yes, the SSL3401HN/1Y automatically detects DC input during initialization and configures its control loops accordingly: LEDPWM remains continuously LOW for maximum current, the 10 ms/8.3 ms feedback window defaults to 10 ms, and dimmer angle detection is disabled. All protections-including UVLO, OTP, OVP, and short-LED-remain fully active. The SSL3401HN/1Y requires only VDD, VDD(IO), and VSS connections to operate reliably from 12 V DC, making it suitable for solar-powered or battery-backed lighting.
What is the purpose of the LOADPWM output on the SSL3401HN/1Y?
The LOADPWM output on the SSL3401HN/1Y drives an external load resistor (RLOAD) to limit boost output voltage overshoot during sudden input power increases-such as dimmer turn-on transients. Its duty cycle decreases as output load power increases, enabling dynamic suppression of VBST spikes. The optimal RLOAD value is calculated as VBST / (ILEDMAX × 0.3). This feature enhances system reliability without requiring larger output capacitors. The SSL3401HN/1Y uses LOADPWM as part of its third PI loop to improve line rejection and overall current stability.
SSL3401HN/1Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- AC DC Offline Switcher
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- 2.6V
- Voltage - Supply (Max):
- 3.6V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 12.5kHz
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- 0°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-HVQFN (5x5)
SSL3401HN/1Y FAQ
1.How can I place an order for SSL3401HN/1Y through Aetrix?
Please submit a Request for Quotation (RFQ) for SSL3401HN/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 SSL3401HN/1Y reliable?
The price and inventory of SSL3401HN/1Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSL3401HN/1Y is usually 5 days.
3.What payment methods are accepted for SSL3401HN/1Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSL3401HN/1Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSL3401HN/1Y?
SSL3401HN/1Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSL3401HN/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 SSL3401HN/1Y?
For technical support, including SSL3401HN/1Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSL3401HN/1Y requirements.
6.How does Aetrix verify that SSL3401HN/1Y is sourced from the original manufacturer or authorized distributors?
All SSL3401HN/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 SSL3401HN/1Y meets industry standards.
7.What is the process for return or replacement of SSL3401HN/1Y?
All SSL3401HN/1Y units undergo pre-shipment inspection (PSI). If there is an issue with SSL3401HN/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 SSL3401HN/1Y part is unused and in its original packaging.
Return procedure for SSL3401HN/1Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSL3401HN/1Y Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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