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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > PFC (Power Factor Correction)

STMicroelectronics STNRG012TR

Name: STNRG012TR
Brand: STMicroelectronics
SKU: STNRG012TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STNRG012TR

Manufacturer:: STMicroelectronics

Category:: PFC (Power Factor Correction)

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: STNRG012TR.pdf

Description:: DIGITAL COMBO MULTI-MODE PFC AND

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STNRG012TR from STMicroelectronics is a digital combo multi-mode PFC + time-shift LLC resonant half-bridge controller in SO-20 package, supporting AC/DC input up to 305 VAC, featuring integrated 800 V startup generator, 10-bit ADC, and SMED-based gate drivers for PFC and LLC stages. It delivers BOM-optimized, high-efficiency operation in street lighting, home lighting, and industrial power supplies compliant with stringent energy regulations.

For engineers reviewing the STNRG012TR datasheet, STNRG012TR pinout, STNRG012TR application, or STNRG012TR equivalent, key selection criteria include its dual-stage digital control architecture, UART-configurable NVM parameters, brownout protection with 77 ms mask time, and hardware-enforced OCP thresholds on PFC_CS (500 mV/900 mV) and LLC_CS (700 mV).

Technical Context

The STNRG012TR integrates an 8-bit microcontroller core with dedicated State Machine Event Driven (SMED) peripherals-two for PFC and two for LLC-enabling deterministic, low-latency response to ZCD, current-sense, and fault events. Its digital control loop uses a 16×16 multiplier and 32-bit accumulator for real-time PFC voltage feed-forward and THD optimization.

Hardware analog IPs include programmable comparators for PFC RECOT (6-bit DAC threshold), PFC OC1/OC2, LLC OCP1/OCP2, and line-synchronized brown-in/out detection using internal 20 MΩ VAC divider. All critical protections-including burst-mode shutdown, OTP (140°C), and VAC surge stop at 430 V-are latched or auto-restart configurable via NVM.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	Up to 305 VAC or DC; enables universal input compatibility without external HV front-end.
PFC Control Mode	Enhanced fixed-on-time multi-mode (TM/DCM) with input voltage feed-forward and THD optimizer.
LLC Control Method	Time-shift algorithm using zero-crossing detection from LLC_CS and auxiliary sensing on LLC_AUX.
Startup Voltage	800 V-rated internal HV start-up generator on VAC pin; eliminates external start-up resistor network.
Gate Drive Capability	HVG/LVG: 0.5 A source / 0.75 A sink; PFC_GD: 0.7 A source / 0.8 A sink - supports fast-switching GaN/Si MOSFETs.
ADC Resolution	10-bit multichannel ADC with programmable event-driven scheduler; enables precise PFC_FB and LLC_FB regulation.
Communication Interface	2-pin UART for black-box logging, firmware patch upload, and real-time monitoring during operation.
Protection Features	Hardware-enforced brownout (112–116 V rising), VAC surge stop (430 V), PFC OVP (2.33 V), and dual-level OCP on PFC_CS/LLC_CS.

Pinout & Package

STNRG012TR is housed in a 20-pin SOIC (SO-20) package with creepage-enhancing NC pins (pins 4 and 19) and isolated high-voltage domains (VAC, BOOT, FGND). The layout separates SGND and PGND paths to minimize noise coupling in mixed-signal operation.

Pin/Terminal	Circuit Role	Design Meaning
1 BOOT	High-side floating supply	Connects bootstrap capacitor to FGND; requires fast diode to VCC for recharge during LLC burst mode.
2 HVG	High-side gate driver output	Drives upper LLC MOSFET; 0.5 A source / 0.75 A sink capability ensures robust turn-on under load transients.
3 FGND	Floating ground reference	Return path for HVG current; must be laid out as tight loop with BOOT to suppress dV/dt-induced shoot-through.
5 LVG	Low-side gate driver output	Drives lower LLC MOSFET; actively pulled to GND during UVLO to prevent unintended conduction.
6 TX / 7 RX	UART interface I/O	Enable field-upgradable firmware, runtime diagnostics, and black-box crash logging to external flash.
8 LLC_CS	LLC tank current sense	Accepts capacitive-divider voltage for zero-crossing detection and dual-level OCP (700 mV / 650 mV).
11 PFC_ZCD	PFC demagnetization detection	Connects to PFC auxiliary winding; triggers COT timing and enables valley switching for efficiency boost.
12 PFC_CS	PFC MOSFET current sense	Monitors R_SENSE voltage; enables enhanced COT control (threshold programmable) and cycle-by-cycle OCP (500 mV).
13 PFC_FB	PFC output voltage feedback	Connects to bulk capacitor divider; feeds 10-bit ADC for closed-loop regulation and OVP (2.33 V threshold).
17 PFC_GD	PFC gate driver output	Drives PFC MOSFET with 0.7 A source / 0.8 A sink; includes UVLO interlock with VCC monitoring.
18 VCC	Main IC supply	9.5–19 V operating range; internal clamp at 19 V protects logic during transient overvoltage.
20 VAC	High-voltage startup & line sense	Direct mains connection; powers internal 800 V start-up generator and provides line voltage feed-forward.

Key Features

Feature	Design Value
Digital dual-stage control	Independent SMED-based state machines for PFC and LLC enable deterministic, low-latency response to ZCD and current faults.
Configurable NVM storage	All key parameters-including OCP thresholds, burst timing, and brownout hysteresis-are stored in one-time-programmable memory for production calibration.
Hardware-accelerated protection	Sub-100 ns propagation delay for brownout, surge stop, and OCP ensures safe shutdown before thermal runaway or MOSFET failure.
Integrated HV start-up	800 V-rated internal DMOS eliminates external start-up resistors and reduces no-load power consumption by >30% vs discrete solutions.
Line-agnostic synchronization	Emulates 60 Hz AC line timing when DC input is detected, maintaining stable PFC/LLC phase alignment without external clock.

Applications

Street Lighting Power Supply

Industrial LED Driver

Use Scenario: Outdoor LED luminaires operating from 230 VAC grid or solar-charged DC bus with wide ambient temperature range (-40°C to +85°C).

IC Role / Device Role / Timing Role: Dual-stage digital controller managing PFC pre-regulation and resonant LLC post-regulation to achieve >94% efficiency and <10% THD.

Use Value: Integrated brownout recovery (77 ms mask) prevents flicker during grid sags; UART enables remote firmware updates for adaptive dimming algorithms.

Use Scenario: High-bay LED fixtures in factory environments subject to voltage surges, dust, and thermal cycling.

IC Role / Device Role / Timing Role: Primary-side digital controller providing isolated, regulated 48 V/3 A output with active PFC and soft-switched LLC topology.

Use Value: Hardware OCP on PFC_CS (500 mV) and LLC_CS (700 mV) ensures single-cycle fault containment; VAC surge stop (430 V) avoids catastrophic failure during lightning events.

Home Lighting Dimmable Ballast

Smart Building DC Microgrid Interface

Use Scenario: DALI-compatible LED drivers requiring smooth 1–10 V dimming response and zero-flicker performance across 100–277 VAC input.

IC Role / Device Role / Timing Role: Digital PFC+LLC controller with line-synchronized modulation and adaptive deadtime tuning for EMI reduction.

Use Value: Programmable THD optimizer adjusts PFC on-time per half-cycle to meet IEC 61000-3-2 Class C limits; UART allows real-time dimming curve calibration.

Use Scenario: Bidirectional DC microgrid node converting 380 VDC bus to 48 VDC for PoE lighting and sensors in commercial buildings.

IC Role / Device Role / Timing Role: AC/DC agnostic controller enabling seamless transition between grid-tied AC and battery-backed DC input without topology change.

Use Value: Internal 20 MΩ VAC divider and DC emulation logic maintain stable PFC regulation and LLC frequency lock regardless of input source type.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital PFC + LLC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28070	Analog multi-mode PFC + separate LLC controller (UCC25630); no integrated MCU, UART, or NVM; requires external op-amps and comparators.	Lacks digital configurability and real-time monitoring; suited for cost-sensitive, fixed-function designs without field update needs.	Select when BOM cost is prioritized over firmware flexibility and diagnostic capability.
NCP1654 + NCP13992	Discrete analog PFC (NCP1654) + resonant LLC (NCP13992); no shared digital core, no unified protection coordination, no UART interface.	Higher component count and layout complexity; limited THD optimization and no line-synchronization emulation for DC input.	Select only for legacy designs where STNRG012TR's integrated digital engine introduces unnecessary complexity.

Compared with UCC28070 and NCP1654+NCP13992, STNRG012TR reduces system BOM count by integrating PFC/LLC control, HV startup, ADC, and UART into one SO-20 IC-enabling faster time-to-market, field-upgradable firmware, and tighter protection coordination across both power stages.

Availability

STNRG012TR is available at Aetrix Electronics and suitable for street lighting, industrial LED drivers, and smart building DC microgrid interfaces requiring stable component supply, long lifecycle support, and production-ready qualification.

Supply support for STNRG012TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The STNRG012TR belongs to ST's digital power controller product line, engineered specifically for high-efficiency, digitally configurable AC/DC and DC/DC converters targeting energy-efficient lighting and industrial power systems.

FAQ

What is the function of the VAC pin beyond startup?

The VAC pin serves three critical roles: (1) powering the internal 800 V startup generator, (2) feeding the internal 20 MΩ voltage divider for line voltage feed-forward and brown-in/out detection, and (3) providing input to the 10-bit ADC for real-time AC peak voltage reading. During DC operation, it emulates 60 Hz line synchronization using internal timing logic.

How does the STNRG012TR handle brownout conditions?

Upon detecting VAC falling below 108 V (brownout threshold), the device disables PFC after a 77 ms mask time and enters sleep mode. It remains disabled for ≥100 ms before rechecking conditions. Brown-in occurs at 112–116 V rising edge. Both thresholds are guaranteed for AC input only and are programmable via NVM for custom hysteresis.

Can the STNRG012TR operate with pure DC input?

Yes. When powered by DC input, the STNRG012TR uses internal timing to emulate 60 Hz line synchronization-maintaining PFC regulation stability and LLC frequency lock without external clock sources. The VAC pin reads DC voltage directly, and the digital engine adapts ZCD timing and feed-forward accordingly.

What protection features are implemented in hardware versus firmware?

Hardware protections include brown-in/out detection, VAC surge stop (430 V), PFC OVP (2.33 V on PFC_FB), and cycle-by-cycle OCP on PFC_CS (500 mV) and LLC_CS (700 mV)-all with sub-100 ns latency. Firmware-managed features include THD optimization, burst-mode scheduling, and UART-triggered black-box logging; these rely on the 8-bit core and ADC but do not affect safety-critical shutdown paths.

STNRG012TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Mode:: Discontinuous Conduction (DCM)

Frequency - Switching:: 15MHz

Current - Startup:: -

Voltage - Supply:: 9.5V ~ 19V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

STNRG012TR FAQ

1.How can I place an order for STNRG012TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STNRG012TR 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 STNRG012TR reliable?

The price and inventory of STNRG012TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STNRG012TR is usually 5 days.

3.What payment methods are accepted for STNRG012TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STNRG012TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STNRG012TR?

STNRG012TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STNRG012TR 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 STNRG012TR?

For technical support, including STNRG012TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STNRG012TR requirements.

6.How does Aetrix verify that STNRG012TR is sourced from the original manufacturer or authorized distributors?

All STNRG012TR 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 STNRG012TR meets industry standards.

7.What is the process for return or replacement of STNRG012TR?

All STNRG012TR units undergo pre-shipment inspection (PSI). If there is an issue with STNRG012TR, 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 STNRG012TR part is unused and in its original packaging.

Return procedure for STNRG012TR:

1.Submit a request within 90 days.

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

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