SSL3401HN/1Y

Overview

The SSL3401HN/1Y is a Switched Mode Power Supply (SMPS) controller IC designed for low voltage dimmable LED lighting applications. It operates with phase cut dimmers and 12 V AC or DC transformers to drive LED devices. The device integrates a dimmer conduction phase detector, hysteretic power converter controller, two embedded Proportional-Integral (PI) controllers, and a 0.052% resolution PWM generator. These features ensure excellent LED current stability across a dimming range from 100% to less than 5%. The component functions as an offline switcher with a minimum supply voltage of 2.6V and a maximum of 3.6V. It operates at a frequency of 12.5kHz and supports surface mount installation in a 32-HVQFN(5x5) package.

Feature Summary

• Integrates a dimmer conduction phase detector for compatibility with phase cut dimmers
• Includes hysteretic controller for the power converter suitable for linear LED current sources
• Features dual embedded PI controllers and high-resolution PWM generator for stable LED current
• Supports wide dimming range from 100% down to less than 5%

Applications

• Low voltage dimmable LED lighting systems
• LED drivers operating with 12 V electronic transformers
• LED drivers operating with 12 V magnetic transformers
• Phase cut dimmer compatible lighting fixtures

Procurement Notes

This component is officially classified as obsolete and no longer manufactured by NXP USA Inc. End of Life notification was issued on June 1, 2016. Procurement must rely on available surplus stock or verified replacement parts. Verify RoHS3 compliance and moisture sensitivity level 3 status before integration. Confirm package integrity for the 32-HVQFN form factor.

Selection Notes

Select this controller for designs requiring precise dimming control with phase cut dimmers. The integrated PI controllers and PWM generator provide high current stability. Ensure the design utilizes a 12 V AC or DC transformer input. The 32-HVQFN package requires appropriate thermal management considerations. Verify compatibility with linear LED current source topologies.

Part Context

The SSL3401HN belongs to the SSL3401 family of low voltage dimmable controllers for LED lighting. It is specifically engineered to work in conjunction with external transformers and dimmers. The device addresses the need for stable LED current regulation in low voltage applications. It represents NXP's solution for integrating dimming detection and power conversion control in a single IC.

Replacement Considerations

Richtek USA Inc. RT7320GSP is documented as a similar substitute part number.