Diodes Incorporated AR2003FV-13

Overview

AR2003FV from Diodes Incorporated is an active/synchronous rectification controller designed for secondary- or primary-side flyback and LLC-resonant power supplies, supporting 4.5V–21V VCC operation, up to 600kHz switching frequency, and 200V drain voltage rating. It implements programmable minimum on/off times (TON/TOFF), light-load detection, UVLO, and SYNC-driven CCM control for high-efficiency AC-DC adapters and USB PD chargers.

For engineers reviewing the AR2003FV datasheet, AR2003FV pinout, AR2003FV application, or AR2003FV equivalent, key selection criteria include its dual-mode (DCM/CCM/CrCM) compatibility, internal feedback resistor support for 5V/12V outputs, low turn-off threshold (−4mV typ), gate drive capability (>2A source / >4A sink), and thermal shutdown at +150°C.

Technical Context

The AR2003FV uses internal drain-to-source (VD–VS) voltage sensing to control external N-channel MOSFETs in synchronous rectification, with gate turn-on triggered at −150mV (typ) and turn-off at −4mV (typ) under VCC ≥ 4.2V. Its TON and TOFF timers are resistor-programmable (RTON: 8.25–100kΩ; RTOFF: 85–200kΩ), enabling noise blanking during MOSFET transitions.

It supports both primary-side and secondary-side configurations via SYNC input for forced turn-off in CCM, and integrates OVP (5.4V/6V thresholds selectable via OVS), over-temperature protection (+150°C trip), and sleep mode entered via TOFF/EN < 0.6V (typ), reducing ICC to 380–600µA.

Key Specifications

Pinout & Package

VDFN3535-14 package: 3.5mm × 3.5mm, 0.5mm pitch, exposed thermal pad (VD pin 9/10). Optimized for high-power density layouts with minimal parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectification controller applications.

Compared with MP6908A and SRK2001, the AR2003FV uniquely combines 200V drain rating, resistor-programmable timing, integrated 5V/12V feedback, and dual-side configurability - delivering lowest BOM count and highest layout flexibility for compact, high-efficiency adapters.

Availability

AR2003FV is available at Aetrix Electronics and suitable for USB PD adaptors, AC-DC battery chargers, and PoE auxiliary power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AR2003FV 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AR2003FV belongs to Diodes' Active Rectification Controller product line, engineered specifically to replace Schottky diodes in high-efficiency AC-DC and DC-DC converters while enabling compact, thermally optimized designs.

FAQ

What is the purpose of the SFB and OVS pins?

The SFB (Secondary Feedback) pin outputs the internal feedback resistor's node, connecting directly to a TL431 cathode to eliminate external resistors in 5V or 12V secondary-side systems. The OVS (Output Voltage Select) pin configures the internal resistor ratio to match either 5V or 12V output targets - reducing BOM count and improving accuracy over temperature versus discrete resistor dividers.

How does the AR2003FV handle light-load conditions?

The AR2003FV detects light-load operation by monitoring whether MOSFET conduction time falls below the programmed TON period. When triggered, it enters sleep mode - disabling gate drive, reducing ICC to 380–600µA, and halting switching until body-diode conduction exceeds TON again. This cuts no-load power loss significantly without requiring external control signals.

Can the AR2003FV be used in primary-side synchronous rectification?

Yes - the AR2003FV supports primary-side configuration using the SYNC pin to receive timing signals from the primary controller (e.g., QR flyback IC), while VD senses the primary switch drain. Its 200V VD rating, programmable TOFF, and low VTHOFF make it suitable for high-side primary-side rectification in resonant or quasi-resonant topologies where secondary-side placement is impractical.

What thermal protection features does the AR2003FV provide?

The AR2003FV includes over-temperature protection that trips at +150°C junction temperature and recovers at +125°C hysteresis. In secondary-side applications, it asserts optical coupler current to signal the primary controller to reduce power delivery - enabling system-level thermal throttling without external sensors or circuitry.