STMicroelectronics STNRGPF02

Overview

STNRGPF02 from STMicroelectronics is a digital 2-channel interleaved CCM boost PFC controller with embedded inrush current limiter (resistive bypass type), fixed-frequency average current mode control, mixed-signal architecture (analog inner current loop + digital outer voltage loop), and programmable thermal/overcurrent protection. It targets >600 W industrial power supplies including UPS, air conditioners, and welding equipment.

For engineers reviewing the STNRGPF02 datasheet, STNRGPF02 pinout, STNRGPF02 application, or STNRGPF02 equivalent, key selection criteria include its TSSOP38 package, dual PWM outputs with 180° interleaving, VIN/VOUT/IOUT/TEMP measurement channels, UART-based configuration via eDesignSuite, and dedicated inrush control on Pin 21 for relay/SCR bypass of series limiting resistors.

Technical Context

The STNRGPF02 implements a cascaded mixed-signal control architecture: the outer digital PI voltage loop generates a peak current reference, which is multiplied by an input-voltage-synchronized LUT to produce a sinusoidal current reference; this feeds an analog hardware PI current compensator that drives PWM generation. Input voltage feedforward (via Pins 31 & 38) and load feedforward (via Pin 33) enable fast transient response to line and load steps.

Its interleaving engine produces two 180° phase-shifted PWM signals (Pins 1 & 16) for channel balancing, while channel current sensing (Pins 35 & 36) enables real-time current balance correction. The device supports burst-mode operation post-soft-start, with configurable Vburst_min/Vburst_max thresholds and status signaling via dedicated open-drain pins (Pins 14 & 15).

Key Specifications

Pinout & Package

TSSOP38 package (7.0 mm × 4.4 mm, 0.65 mm pitch), thermally enhanced with exposed pad for PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28070 and ICE3PCS01G, STNRGPF02 delivers full digital configurability, integrated inrush control, and dual-channel interleaving-enabling higher power density, lower EMI, and simplified system design for >600 W applications without external microcontrollers or discrete inrush circuits.

Availability

STNRGPF02 is available at Aetrix Electronics and suitable for industrial UPS systems, air conditioning compressors, welding power supplies, and high-power battery chargers requiring stable component supply, long-term lifecycle support, and programmable PFC functionality.

Supply support for STNRGPF02 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, sensors, and analog devices for industrial, automotive, and consumer markets.

The STNRGPF02 belongs to ST's STNRG digital PFC controller product line, engineered specifically for high-efficiency, digitally configurable, interleaved boost PFC stages in industrial-grade power supplies above 600 W.

FAQ

What is the function of Pin 21 on the STNRGPF02?

Pin 21 is the INRUSH_CTRL output, an active-high signal that directly drives a relay or SCR (S1) to short the series inrush limiting resistor after the bulk capacitors reach ~90% of peak AC voltage. This eliminates steady-state conduction losses while maintaining robust inrush suppression during cold starts.

How does the STNRGPF02 implement interleaving between its two PFC channels?

The STNRGPF02 generates two PWM outputs (Pins 1 and 16) with precisely controlled 180° phase shift using an internal SET/RESET flip-flop architecture synchronized to the CLOCK signal (Pin 2). This ensures balanced current sharing, reduced input/output ripple, and minimized EMI without requiring external timing components or complex synchronization circuitry.

Can the STNRGPF02 operate without external programming?

No-the STNRGPF02 requires initial configuration via ST's eDesignSuite software and STSW-STNRGPF01 programming tool over UART. Its flash memory contains no default operational firmware; parameters such as switching frequency, protection thresholds, burst mode levels, and feedforward gains must be programmed before first use.

What is the role of Pins 35 and 36 in system operation?

Pins 35 (I[0]) and 36 (I[1]) are dedicated analog inputs for per-channel current sensing. The internal circuitry uses these measurements to dynamically adjust PWM duty cycles and enforce real-time current balance between the two interleaved boost channels-critical for thermal uniformity, reliability, and achieving specified ripple reduction.