Renesas R2A20104SP#U0

Overview

R2A20104SP#U0 from Renesas Electronics is a continuous conduction mode (CCM) interleaving PFC control IC in SOP-20 package, designed for high-efficiency AC-DC front-end power supplies. It supports current transformer–based current sensing, delivers 70–86 kHz fixed-frequency boost control, integrates dual-phase gate drivers (GD1/GD2), and operates across –40°C to +150°C junction temperature with 2.5 V ±1.5% feedback reference voltage.

For engineers reviewing the R2A20104SP#U0 datasheet, R2A20104SP#U0 pinout, R2A20104SP#U0 application, or R2A20104SP#U0 equivalent, key selection criteria include interleaved CCM PFC topology support, SOP-20 thermal performance (θ_JA = 120°C/W), brownout detection threshold (0.74–0.9 V at BO), and absence of OVP2 and phase-drop features compared to FP variants.

Technical Context

The R2A20104SP#U0 implements interleaved CCM PFC using two independent current-forming blocks synchronized with 180° phase shift, reducing input/output ripple and enabling smaller passive components. Its oscillator uses RT/SYNC and CT pins to set nominal switching frequency (78 kHz typ.), while FM pin enables fixed-period frequency modulation (6–14 kHz) for EMI reduction.

Protection architecture includes brownout detection (BO), dual overcurrent protection per phase (CS1/CS2), dynamic/static OVP on FB pin, feedback loop open detection (FBOPEN), and UVLO with 10.4 V turn-on and 8.9 V turn-off thresholds. It lacks OVP2, phase-drop (PD), and SYNC-O output-features reserved for LQFP-40 FP variants.

Key Specifications

Pinout & Package

Pb-free SOP-20 package (JEITA PRSP0020DD-B, Renesas FP-20DAV), 5.5 mm × 12.6 mm footprint, 1.27 mm lead pitch, 0.31 g typical mass. Thermal performance optimized for industrial power supply layouts with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC28070PW and FAN9612IN, R2A20104SP#U0 uniquely combines transformer-based current sensing, built-in brownout detection, and fixed-period frequency modulation in an SOP-20 package-making it optimal for high-reliability, EMI-constrained, transformer-coupled PFC designs where layout simplicity and thermal margin are prioritized.

Availability

R2A20104SP#U0 is available at Aetrix Electronics and suitable for server power supplies, industrial motor drive front-ends, medical imaging systems, telecom rectifiers, and high-reliability AC-DC converters requiring stable component supply and long-term industrial lifecycle support.

Supply support for R2A20104SP#U0 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise applications.

The R2A20114 Series-including R2A20104SP#U0-is engineered specifically for high-efficiency, interleaved CCM PFC in industrial and computing power supplies, emphasizing thermal resilience, EMI mitigation, and robust line-fault handling.

FAQ

What is the primary function of R2A20104SP#U0 in a power supply design?

R2A20104SP#U0 serves as a dedicated continuous conduction mode (CCM) interleaving PFC controller that regulates the DC bus voltage in AC-DC power supplies. It drives two boost converters with 180° phase shift using current transformer sensing, ensuring high power factor, low THD, and reduced ripple. The R2A20104SP#U0 integrates gate drivers, protection circuits, and analog control blocks to replace discrete solutions in industrial and computing power systems.

Does R2A20104SP#U0 support shunt resistor current sensing?

No, R2A20104SP#U0 supports current transformer–based current sensing only, as confirmed by the datasheet's Function List and Pin Functions tables. Shunt resistor sensing is exclusive to the R2A20114SP/FP variants. Attempting shunt-based sensing with R2A20104SP#U0 will result in incorrect current measurement and potential protection failure, because its CSO amplifiers are calibrated for transformer-derived signals-not mV-level shunt voltages.

What protection features are included in R2A20104SP#U0?

R2A20104SP#U0 includes brownout detection (BO), UVLO, dual-phase overcurrent protection (CS1/CS2), dynamic/static OVP on the FB pin, feedback loop open detection (FBOPEN), and gate driver current limiting. It does not include OVP2, phase-drop (PD), or SYNC-O output-features documented only for the LQFP-40 FP variants. All protections are hardware-based with defined thresholds and hysteresis, such as 0.82 V BO turn-on and 1.08×VREF static OVP.

Can R2A20104SP#U0 be synchronized to an external clock?

R2A20104SP#U0 accepts external synchronization signals on the RT/SYNC pin but does not provide a synchronization output (SYNC-O). This allows master-slave configuration in multi-channel systems but prohibits cascading or daisy-chaining. The absence of SYNC-O is explicitly noted in the Function List table for R2A20104SP, distinguishing it from R2A20104FP which includes SYNC-O. External sync must be TTL/CMOS compatible and meet the 2.0–3.0 V rising-edge threshold.

What is the thermal performance of R2A20104SP#U0 in its SOP-20 package?

R2A20104SP#U0 has a junction-to-ambient thermal resistance (θ_JA) of 120°C/W when mounted on a standard 50×50 mm glass epoxy PCB with 10% copper coverage. This value-documented on page 7 of the datasheet-supports continuous operation up to +150°C junction temperature under typical industrial loads. Derating is required above 85°C ambient; full 1 W power dissipation is only permissible below 30°C ambient due to the package's limited thermal mass and lack of exposed pad.