Diodes Incorporated APR3415MTR-G1

Overview

APR3415MTR-G1 from Diodes Incorporated is a secondary-side synchronous rectification (SR) Combo IC integrating an N-channel MOSFET and driver for DCM-mode flyback converters. It features 12 mΩ R_DS(ON) at V_GS = 4.5 V, 15 A continuous drain current, and output voltage detect functionality for primary-side control coordination. It enables high-efficiency 5 V output adapters and chargers with fast turn-on/turn-off timing (t_DON = 70 ns, t_DOFF = 100 ns).

For engineers reviewing the APR3415MTR-G1 datasheet, APR3415MTR-G1 pinout, APR3415MTR-G1 application, or APR3415MTR-G1 equivalent, this device supports precise SR timing in low-voltage flyback systems, integrates dynamic OVP discharge (IOVP = 40–100 mA), and delivers stable operation across –40°C to +85°C ambient.

Technical Context

The APR3415 implements a voltage-sensing SR controller with dual-threshold detection (V_THON = 0 V, V_THOFF = –12.5 mV) and blanking via minimum on-time timer (t_{LEB_L} = 6.5 μs max). Its internal oscillator (t_OSC = 18–37.5 μs) and dynamic OVP circuit (VOVP = 5.8–6.0 V, t_{OVP_LAST} = 2.0 ms) coordinate with primary-side controllers through periodic VDET pulses and discharge signaling.

It uses volt-second product detection (K_qs = 0.325–0.515 mA·μs) referenced to AREF to reject resonant ringing interference during DCM flyback dead time. The integrated MOSFET's low gate charge (Q_g = 15.2 nC) and fast switching (t_RG/t_FG = 50–100 ns) minimize conduction and switching losses in compact AC/DC power supplies.

Key Specifications

Pinout & Package

APR3415MTR-G1 is housed in a standard SO-8 package with exposed thermal pad (pin 5–6 GND and pin 7–8 DRAIN internally connected to die source/drain). The 8-pin layout supports compact PCB placement and efficient thermal management in high-density AC/DC adapters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP4341MTR-G1, APR3415MTR-G1 adds autonomous OVP discharge and enhanced ringing immunity-critical for unattended consumer adapters. Versus MP6908GJ-Z, it offers lower R_DS(ON), faster timing, and configurable volt-second rejection-enabling higher efficiency and reliability in cost-sensitive DCM flyback systems.

Availability

APR3415MTR-G1 is available at Aetrix Electronics and suitable for USB-C wall adapters, DSL modem power supplies, MP3 player chargers, and IoT sensor node auxiliary supplies requiring stable component supply, green compliance, and DCM-mode synchronous rectification performance.

Supply support for APR3415MTR-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

APR3415 belongs to Diodes' secondary-side synchronous rectification product line, designed specifically to replace Schottky diodes in DCM flyback converters-delivering higher efficiency, tighter regulation, and simplified layout for compact AC/DC power supplies.

FAQ

What is the purpose of the AREF pin and how is its resistor value determined?

The AREF pin sets the volt-second product threshold for ringing immunity using an external resistor to GND. Its value is calculated via R_AREF = Area₂ / K_{qs, where Area2 lies between the worst-case ringing (Area3) and primary-switch-on (Area1) volt-second integrals. Diodes recommends 100 nF CAREF in parallel to stabilize the threshold against noise.}

How does APR3415 handle output overvoltage protection?

APR3415 implements two-stage OVP: first, V_DIS (5.28–5.52 V) triggers a 1.5–4.5 mA discharge current into VCC for soft clamping; second, V_OVP (5.8–6.0 V) activates a 40–100 mA pulse lasting exactly 2.0 ms (t_{OVP_LAST}). Both stages disable VDET pulses during discharge to prevent PSR interference.

Can APR3415 operate in continuous conduction mode (CCM) flyback topologies?

No-APR3415 is explicitly designed for discontinuous conduction mode (DCM) operation only. Its timing architecture, including minimum on-time blanking and VDET pulse generation, relies on the presence of a distinct secondary current zero-crossing and primary-side dead time inherent to DCM. CCM operation will cause erratic SR switching and potential shoot-through.

What thermal considerations apply to the SO-8 package under 15 A continuous current?

With θ_JC = 24 °C/W and P_D = 0.7 W at T_A = 25°C, junction temperature rise is ~17°C above case. To sustain 15 A continuously, the PCB must provide ≥1 inch² 2 oz copper thermal pad connected to pins 5–6 (GND) and pins 7–8 (DRAIN), per Diodes' recommended layout-ensuring T_J stays ≤125°C at 85°C ambient.