Diodes Incorporated APR3415CMTR-G1

Overview

APR3415CMTR-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) @ 4.5 V, 15 A continuous drain current, and output voltage detect functionality for primary-side control coordination. Designed for 5 V output adapters and chargers, it reduces secondary-side conduction loss by replacing Schottky diodes.

For engineers reviewing the APR3415CMTR-G1 datasheet, APR3415CMTR-G1 pinout, APR3415CMTR-G1 application, or APR3415CMTR-G1 equivalent, key selection criteria include SR timing accuracy (t_DON = 70–130 ns), V_THOFF = −20 to −5 mV turn-off threshold, volt-second product detection via AREF, and SO-8 thermal performance (θ_JA = 170 °C/W).

Technical Context

The APR3415CMTR-G1 implements a dual-function architecture: a high-speed SR driver with adaptive gate turn-on/off thresholds (V_THON = 0–1 V, V_THOFF = −20 to −5 mV) and a dynamic output voltage monitor that generates periodic pulses at VDET when V_CC < V_TRIGGER (5.25–5.35 V), enabling primary-side transient response improvement.

Its internal oscillator operates at 18–37.5 μs period (t_OSC) and integrates a minimum on-time blanking circuit triggered by (V_DET−V_CC)×t_ONP, with K_qs = 0.325–0.515 mA·μs defining AREF resistor scaling for ringing immunity in DCM flyback topologies.

Key Specifications

Pinout & Package

APR3415CMTR-G1 is housed in a standard SO-8 package with exposed thermal pad (non-leaded, RoHS/Green compliant). Pin 1 (DRISR) delivers gate drive; pins 5–6 (GND) and 7–8 (DRAIN) are internally connected to MOSFET source and drain terminals respectively.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP4341CMTR-G1, APR3415CMTR-G1 saves board space and improves light-load efficiency via integrated MOSFET and lower I_OP; versus SRK1001MTR, it offers tighter timing control and PSR feedback support essential for 5 V adapter compliance.

Availability

APR3415CMTR-G1 is available at Aetrix Electronics and suitable for USB-C adapters, DSL modem power supplies, and portable audio charger designs requiring stable component supply, RoHS/Green compliance, and SO-8 thermal reliability.

Supply support for APR3415CMTR-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.

The APR3415 belongs to Diodes' secondary-side synchronous rectification product line, engineered specifically for high-efficiency, low-component-count DCM flyback converters in compact AC/DC adapters and auxiliary 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 rejecting primary-side ringing noise during DCM flyback operation. Its resistor value is calculated using K_qs (0.325–0.515 mA·μs) and the target (V_DET−V_CC)×t_ONP area, typically 25–50 V·μs. For example, with K_qs = 0.4 mA·μs and target area = 25 V·μs, R_AREF ≈ 62.5 kΩ. A 100 nF capacitor (CAREF) is recommended in parallel for stability.

How does APR3415CMTR-G1 improve transient response in PSR-controlled flyback converters?

It improves transient response by generating periodic pulses at the VDET pin when output voltage drops below V_TRIGGER (5.25–5.35 V), signaling the primary-side controller to increase duty cycle before output droop occurs. This feedforward-like action reduces recovery time by up to 40% compared to systems without VDET coordination, especially under sudden load steps.

Can APR3415CMTR-G1 be used in CCM-mode flyback converters?

No - APR3415CMTR-G1 is explicitly designed for DCM-mode operation only. Its V_THOFF threshold (−20 to −5 mV) and minimum on-time blanking logic rely on the natural zero-current crossing inherent to DCM. In CCM, continuous secondary current prevents reliable zero-crossing detection, causing erratic SR switching and potential shoot-through.

What is the maximum allowable drain-source voltage stress during startup or fault conditions?

The absolute maximum V_DRAIN rating is 50 V, verified per datasheet Absolute Maximum Ratings. During startup, V_DRAIN may reach up to 45 V due to transformer leakage inductance ringing; sustained operation above 45 V risks exceeding safe operating area limits. Layout best practices (snubbers, minimized loop area) are required to keep peak V_DRAIN < 42 V in production designs.