Diodes Incorporated APR34910S-13

Overview

APR34910S-13 from Diodes Incorporated is a secondary-side synchronous rectification (SR) combo IC integrating an N-channel MOSFET and gate driver for flyback AC-DC converters. It supports CCM, DCM, and quasi-resonant operation, delivers 100 V drain-source breakdown voltage, 10 mΩ R_DS(ON), and -200 mV turn-on threshold, enabling high-efficiency power delivery in compact smartphone quick chargers.

For engineers reviewing the APR34910S-13 datasheet, APR34910S-13 pinout, APR34910S-13 application, or APR34910S-13 equivalent, key selection criteria include its smart-blanking shoot-through prevention, internal PLR biasing down to 0 V output, -7 mV turn-off threshold, and SO-8 (Type CJ2) package compatibility with high-density PCB layouts.

Technical Context

The APR34910S-13 implements intelligent gate control using drain-voltage sensing (VDET) to trigger MOSFET conduction when V_DRAIN falls below -200 mV, with a 30 ns turn-on delay and 15 ns turn-off propagation delay. Its forward regulation maintains V_DS ≈ -40 mV during decreasing secondary current.

Smart-blanking logic detects ≥2 false turn-ons within 4 µs during T_OFF and blanks the gate driver for 20 µs to prevent transformer shoot-through. Internal PLR enables self-biasing from drain voltage across 3.3–24 V output range without external supply components.

Key Specifications

Pinout & Package

APR34910S-13 is housed in an SO-8 package (Type CJ2), with exposed thermal pad not connected internally and four parallel DRAIN terminals for low-inductance, high-current path routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6908GJ-Z and SRK1001TR, the APR34910S-13 uniquely combines zero-V_OUT startup capability, integrated smart-blanking, and four paralleled DRAIN terminals - delivering higher integration, lower system-level component count, and improved reliability in high-density, multi-mode flyback designs.

Availability

APR34910S-13 is available at Aetrix Electronics and suitable for smartphone quick chargers, notebook computer adaptors, and set-top box (STB) power supplies requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for APR34910S-13 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.

The APR34910S-13 belongs to Diodes' synchronous rectification controller product line, engineered specifically to replace Schottky diodes in high-efficiency flyback converters while eliminating external timing and protection components.

FAQ

What is the minimum output voltage required for APR34910S-13 to start operation?

The APR34910S-13 can initiate operation with 0 V output voltage due to its internal Pulse Linear Regulator (PLR), which derives bias from the drain node. This enables reliable startup in ultra-low-voltage applications such as 3.3 V USB-C PD sink designs where auxiliary windings are impractical.

How does the smart-blanking function prevent shoot-through in QR flyback converters?

Smart-blanking activates when the device detects two false turn-on events on the VDET pin within a 4 µs window during T_OFF. It then disables the gate driver for 20 µs - long enough to skip resonant ringing peaks that could otherwise cause simultaneous conduction of primary and secondary switches and destructive transformer shoot-through.

Can APR34910S-13 be used in high-side SR configuration?

Yes - the APR34910S-13 supports both high-side and low-side synchronous rectification configurations. Its VDET pin senses drain voltage relative to GND, and the four DRAIN pins allow flexible PCB routing; external gate drive isolation or level-shifting circuitry is required for high-side implementation per application schematics in DS43209.

What thermal derating applies above +85°C ambient temperature?

With θ_JA = 78 °C/W and maximum junction temperature T_J = +150°C, the APR34910S-13 must derate linearly above +85°C ambient: power dissipation drops from 0.6 W at +85°C to 0 W at +150°C, yielding ~9.7 mW/°C derating slope. Layout with thermal vias under GND pads improves real-world margin.