Diodes Incorporated APR3415BMTR-G1

Overview

APR3415BMTR-G1 from Diodes Incorporated is a secondary-side synchronous rectification (SR) Combo IC integrating an N-channel MOSFET and gate driver for DCM-mode flyback converters. It features 12 mΩ R_DS(ON) (typ), 15 A continuous drain current, and V_THOFF = −12.5 mV for precise zero-current turn-off detection-enabling high-efficiency 5 V output adapters and chargers.

For engineers reviewing the APR3415BMTR-G1 datasheet, APR3415BMTR-G1 pinout, APR3415BMTR-G1 application, or APR3415BMTR-G1 equivalent, this device delivers verified SR timing control, integrated OVP discharge response (t_{OVP_LAST} = 2.0 ms), and volt-second product–based ringing immunity critical for stable PSR feedback in compact AC/DC power supplies.

Technical Context

The APR3415B operates exclusively in discontinuous conduction mode (DCM) flyback topologies, using drain-to-source voltage sensing (V_THOFF = −12.5 mV) to trigger MOSFET turn-off before reverse current flow. Its dynamic VDET oscillator (t_OSC = 18–37.5 μs) provides periodic signals for primary-side regulation when output voltage drops below V_TRIGGER = 5.2 V.

It integrates a programmable volt-second threshold via AREF resistor to reject resonant ringing false triggers, with K_qs = 0.325–0.625 mA·μs linking R_AREF to the integration threshold. The internal OVP circuit asserts 40–100 mA discharge current (IOVP) at VOVP = 5.7–5.9 V and holds for t_{OVP_LAST} = 2.0 ms.

Key Specifications

Pinout & Package

APR3415BMTR-G1 is housed in a standard SO-8 package (6.20 × 5.10 mm, 1.75 mm height) with exposed thermal pad (not electrically connected). Dual GND and DRAIN pins provide low-inductance source/drain routing for high-frequency SR operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP4341GMT-13 and MP6908GJ-Z, APR3415BMTR-G1 uniquely combines MOSFET + driver + VDET signaling + volt-second discrimination in one SO-8 package-reducing BOM count by 3 components and eliminating gate loop layout sensitivity in cost-sensitive 5 V adapter designs.

Availability

APR3415BMTR-G1 is available at Aetrix Electronics and suitable for USB-C wall adapters, DSL modem power supplies, wireless phone chargers, and IoT sensor hub auxiliary rails requiring stable component supply, green compliance, and DCM-specific synchronous rectification performance.

Supply support for APR3415BMTR-G1 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 leader in discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The APR3415B belongs to Diodes' secondary-side SR controller product line, engineered specifically for cost-sensitive, high-volume 5 V DCM flyback adapters where integration, ringing immunity, and PSR compatibility are mandatory design constraints.

FAQ

What is the minimum output voltage required for APR3415BMTR-G1 to initiate synchronous rectification?

The device requires V_CC ≥ 3.1 V (typical startup voltage) to begin operation, but SR activation depends on the (V_DET − V_CC) differential exceeding an internal reference. Per datasheet Note 6, the effective minimum SR operating voltage is V_{S_MIN} = 4.5 V - meaning the system output must sustain ≥4.5 V under load for reliable gate drive enablement.

How does the AREF resistor value affect noise immunity in high-frequency flyback designs?

The AREF resistor sets the volt-second product threshold (Area2 = K_qs × R_AREF) that distinguishes true flyback conduction from parasitic ringing. A higher R_AREF raises the threshold, increasing immunity to 10–30 MHz ringing but risking missed turn-on during light loads; typical values range 10–47 kΩ depending on transformer leakage and snubber design.

Can APR3415BMTR-G1 be used in quasi-resonant (QR) flyback topologies?

No - the APR3415B is explicitly designed for DCM-only operation. Its timing logic, V_THOFF threshold, and VDET oscillator behavior assume zero-current switching with clear dead-time intervals. In QR mode, continuous conduction and variable frequency disrupt its detection window, causing erratic SR turn-on and potential shoot-through.

What thermal derating applies when operating APR3415BMTR-G1 at 85°C ambient?

With θ_JA = 170 °C/W and T_J(MAX) = 150 °C, maximum allowable power dissipation at 85°C ambient is P_D = (150 − 85) / 170 = 0.382 W. At 15 A and 12 mΩ R_DS(ON), conduction loss alone is 2.7 W - confirming the need for substantial copper pour, thermal vias, and/or forced airflow to maintain safe junction temperature.