Texas Instruments TPS92311D/NOPB

Overview

TPS92311D/NOPB from Texas Instruments is a primary-side sensing, off-line LED driver IC with integrated 600V/3.75Ω power MOSFET, adaptive constant-on-time (COT) control, and critical-conduction-mode (CRM) operation for inherent PFC. It delivers up to 8W output with ±7% LED current regulation, supports isolated/non-isolated flyback topologies, and targets A19, PAR30/38, and GU10 LED lamps.

For engineers reviewing the TPS92311D/NOPB datasheet, TPS92311D/NOPB pinout, TPS92311D/NOPB application, or TPS92311D/NOPB equivalent, key selection considerations include its 600V MOSFET breakdown voltage, programmable delay timing via DLY pin, ZCD-based valley switching, thermal shutdown at 165°C, and dual-mode configuration (MODE1/MODE2) for isolated vs. non-isolated designs.

Technical Context

The TPS92311D/NOPB implements CRM operation using zero-current detection via the ZCD pin, dynamically adjusting switch on-time based on auxiliary winding voltage and primary peak current. Its adaptive COT algorithm maintains high power factor without secondary-side feedback.

Control is implemented through two configurable modes: Constant ON-Time (COT) for high PF and Peak Current Mode (PCM) for lower output ripple. Protection includes cycle-by-cycle overcurrent detection (0.61V/3.4V thresholds), output overvoltage protection triggered by ZCD-PEAK exceeding 4.3V, and thermal shutdown with 20°C hysteresis.

Key Specifications

Pinout & Package

TPS92311D/NOPB is housed in a 16-pin narrow SOIC package (SOIC-16N) with exposed pad for thermal enhancement. Pin 1 is located at the top-left corner adjacent to the index mark.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with UCC28810DR and NCP1015ST100T3G, the TPS92311D/NOPB uniquely combines integrated 600V MOSFET, adaptive COT, and ZCD-based valley switching in a single SOIC-16 package - delivering best-in-class PF, efficiency, and design simplicity for 5–8W LED lamps.

Availability

TPS92311D/NOPB is available at Aetrix Electronics and suitable for LED lamp retrofit, directional lighting, and solid-state lighting modules requiring stable component supply, long-lifecycle assurance, and full traceability.

Supply support for TPS92311D/NOPB 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.

The TPS92311D/NOPB belongs to TI's LED lighting controller product line, engineered specifically for cost-effective, high-PF, primary-side regulated AC/DC LED drivers targeting residential and commercial retrofit lamps.

FAQ

What is the maximum output power supported by the TPS92311D/NOPB?

The TPS92311D/NOPB is optimized for LED loads up to 8W, as confirmed in the official datasheet's "Features" and "Typical Application" sections. This limit arises from thermal constraints of the integrated 3.75Ω/600V MOSFET and the SOIC-16 package's 95°C/W junction-to-ambient thermal resistance. Exceeding 8W risks thermal shutdown activation above 125°C junction temperature, making the TPS92311D/NOPB unsuitable for >10W designs without significant derating or heatsinking.

How does the TPS92311D/NOPB achieve power factor correction without a dedicated PFC controller?

The TPS92311D/NOPB achieves inherent power factor correction through adaptive constant-on-time (COT) control in critical-conduction-mode (CRM) operation. By synchronizing MOSFET turn-on with valley switching detected via the ZCD pin and dynamically adjusting on-time based on line voltage, it shapes input current to closely follow the sinusoidal input voltage waveform - yielding >0.9 PF across 85–265VAC without auxiliary PFC circuitry. This behavior is explicitly documented in the "APPLICATION INFORMATION" section of the SNVS811B datasheet.

What are the exact voltage thresholds for overvoltage protection on the TPS92311D/NOPB?

The TPS92311D/NOPB triggers overvoltage protection (OVP) when the ZCD pin voltage (V_ZCD-PEAK) exceeds 4.3V (typical), with a guaranteed threshold range of 4.1V to 4.5V across temperature and process variation. This condition must persist for three consecutive switching cycles before OVP activates, causing the IC to halt switching and discharge VCC until UVLO reset occurs. The threshold is set internally and cannot be adjusted externally, as specified in the "Electrical Characteristics" table under V_ZCD-OVP.

Can the TPS92311D/NOPB drive LEDs in a non-isolated configuration?

Yes, the TPS92311D/NOPB supports non-isolated operation using Constant ON-Time (COT) mode, configured by grounding MODE2 and leaving MODE1 floating (per Table 1 in the datasheet). In this mode, it functions as a buck-derived regulator with primary-side current sensing, offering higher efficiency and better load regulation than isolated topologies. However, non-isolated designs require careful attention to safety isolation requirements and user-accessible circuit separation per IEC 61347-1.

What is the purpose of the DLY pin on the TPS92311D/NOPB, and how is it configured?

The DLY pin on the TPS92311D/NOPB sets the delay time between ZCD trigger detection and MOSFET turn-on to minimize switching loss and EMI. It is configured by connecting a single resistor (R_DLY) from DLY to GND; typical values range from 1kΩ to 100kΩ, corresponding to delays of ~100ns to ~2000ns per Figure 18. The internal DLY reference voltage is 1.23V (±2%), and the source current is 250µA, enabling precise timing control without additional components.