Renesas R2A20135SP#W5

Overview

R2A20135SP#W5 from Renesas Electronics is an LED lighting power controller IC for non-isolated step-down (buck) topologies, featuring integrated dimming control (Triac, PWM, DC), constant-on-time regulation, and dual-mode operation (Zero Current Detection or Fixed Frequency). It delivers high power factor (>0.9) and efficiency while enabling precise LED current regulation with ±5% typical accuracy via its 0.204 V feedback reference. Used in commercial LED retrofit lamps and indoor luminaires requiring compact, cost-effective AC-DC driver solutions.

For engineers reviewing the R2A20135SP#W5 datasheet, R2A20135SP#W5 pinout, R2A20135SP#W5 application, or R2A20135SP#W5 equivalent, key selection considerations include UVLO thresholds (12 V ON / 9.2 V OFF), adjustable switching frequency (43–53 kHz), 8-pin SOP package thermal performance (θja = 120°C/W), and compatibility with Triac-dimmable mains input designs.

Technical Context

The R2A20135SP#W5 implements constant-on-time (COT) control with internal error amplifier (transconductance gm = 45 μs, Vfb = 0.204 V) and dual operating modes selected by RT pin configuration: open-circuit enables Zero Current Detection mode for superior noise immunity, while grounding RT selects Fixed Frequency mode optimized for THD reduction and power factor correction. Both modes maintain active PFC functionality without external compensation.

Its gate driver (OUT pin) delivers ±20 mA peak sink/source capability with 30–100 ns rise/fall times into 1000 pF, supporting discrete MOSFETs in buck converters up to 50 W. The IC integrates UVLO (hysteresis 2.8 V), ZCD comparator (8 mV threshold), and PWM dimming interface with 2.7 V logic threshold and 100 kHz max input frequency.

Key Specifications

Pinout & Package

Package: Pb-free SOP-8 (JEDEC PRSP0008DJ-A), 3.94 mm × 4.93 mm footprint, 1.27 mm pitch, 0.073 g mass, θja = 120°C/W on 40 × 40 mm² 10% copper board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP4007GN-Z and BP5758D, the R2A20135SP#W5 uniquely combines ZCD/Fixed Frequency dual-mode operation, native Triac/PWM/DC dimming, and high-precision 0.204 V current sense in a single SOP-8 package-making it optimal for non-isolated, dimmable commercial LED drivers requiring design flexibility and EMI resilience.

Availability

R2A20135SP#W5 is available at Aetrix Electronics and suitable for commercial LED retrofit lamps, indoor panel lights, and industrial high-bay lighting requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.

Supply support for R2A20135SP#W5 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 headquartered in Japan, specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and IoT applications.

The R2A20135SP#W5 belongs to Renesas' LED Lighting Power Controller product line, designed specifically for cost-sensitive, non-isolated AC-DC LED drivers requiring high power factor, low THD, and multi-standard dimming support in compact form factors.

FAQ

What dimming methods does the R2A20135SP#W5 support?

The R2A20135SP#W5 supports Triac phase-cut dimming (via FB+ pin filtering), PWM dimming (via dedicated PWM pin with 2.7 V logic threshold), and DC dimming (via analog voltage applied to FB+ pin). All three modes are implemented natively without external ICs or level shifters, and can be used independently or in combination depending on system architecture. This makes the R2A20135SP#W5 highly adaptable across residential, commercial, and industrial LED lighting platforms.

How does the R2A20135SP#W5 achieve power factor correction without a dedicated PFC stage?

The R2A20135SP#W5 achieves active power factor correction through its constant-on-time (COT) control architecture operating in either Zero Current Detection or Fixed Frequency mode. By dynamically adjusting on-time based on input voltage and output current demand, it shapes the input current waveform to closely follow the sinusoidal AC voltage, achieving >0.9 PF in typical non-isolated buck configurations. No boost pre-regulator or external PFC controller is required, reducing system complexity and cost.

What is the purpose of the RT pin on the R2A20135SP#W5?

The RT pin on the R2A20135SP#W5 serves two critical functions: mode selection and frequency setting. Leaving RT open configures the R2A20135SP#W5 for Zero Current Detection mode, optimizing noise immunity. Connecting RT to GND via a resistor selects Fixed Frequency mode and sets the switching frequency (43–53 kHz typical with 200 kΩ). This dual-role pin eliminates the need for separate mode-select jumpers or external clock generators, simplifying layout and bill-of-materials.

Can the R2A20135SP#W5 drive a MOSFET directly without a gate driver IC?

Yes, the R2A20135SP#W5 can drive discrete MOSFETs directly via its OUT pin, which provides ±20 mA peak sink/source current and 30–100 ns rise/fall times into 1000 pF. This is sufficient for driving small-to-medium power MOSFETs such as Si2302 or 2N7002 in buck converters up to 50 W. For higher-power applications or faster switching, an external gate driver may still be recommended-but the R2A20135SP#W5's integrated drive capability significantly reduces component count in most commercial LED driver designs.

What is the recommended PCB layout practice for the FB and COMP pins of the R2A20135SP#W5?

For stable operation, the FB pin of the R2A20135SP#W5 must be routed with a short, direct trace to the LED current-sense resistor, avoiding proximity to noisy nodes like OUT or switching inductors. The COMP pin requires a low-noise RC compensation network (typically 1–10 nF capacitor and 10–100 kΩ resistor) placed adjacent to the IC with ground plane underneath-no vias in the feedback path. These practices prevent oscillation and ensure loop stability, especially critical in high-gain error amplifiers like the one in the R2A20135SP#W5 (Av = 63 dB, gm = 45 μs).