Diodes Incorporated ZXGD3113W6-7

Overview

ZXGD3113W6-7 from Diodes Incorporated is a synchronous MOSFET controller in SOT26 package, designed to replace the body diode in flyback converters by driving an external N-channel MOSFET as an ideal diode. It features -10 mV detector threshold, 6.2 mA quiescent current, and operates across 3.5–40 V_CC, supporting DCM/CrCM/CCM modes up to 250 kHz.

For engineers reviewing the ZXGD3113W6-7 datasheet, ZXGD3113W6-7 pinout, ZXGD3113W6-7 application, or ZXGD3113W6-7 equivalent, key selection considerations include gate drive sink/source capability (1.5 A source / 3 A sink), proportional V_GS control vs. V_DS, rapid zero-current turn-off behavior, and SOT26 thermal performance under high-voltage drain sensing.

Technical Context

The ZXGD3113W6-7 implements a differential amplifier-based detector that monitors MOSFET drain-to-source voltage and applies proportional gate drive to maintain low forward conduction loss while enabling fast turn-off when reverse bias exceeds -10 mV. Its architecture supports operation across discontinuous, critical, and continuous conduction modes without external timing components.

Gate drive output scales with V_DS during conduction, delivering up to 17.8 V at V_D = -100 mV (V_CC = 19 V), and collapses rapidly near zero current due to internal feedback. The REF and BIAS pins set reference and bias currents via external resistors, enabling precise threshold tuning and stable operation over temperature (-40°C to +150°C).

Key Specifications

Pinout & Package

SOT26 surface-mount package with 6-pin layout, 1.10 mm nominal height, 2.80 mm × 2.70 mm footprint, and UL 94V-0 molded green compound. Thermal resistance R_θJA = 250°C/W on minimal FR-4 pad; reduces to 123°C/W with dual 15 mm × 15 mm copper heatsinks on V_CC and BIAS pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP4307DR2G and SiHP2110BDY, the ZXGD3113W6-7 offers superior light-load efficiency via -10 mV threshold and proportional gate drive, wider drain voltage range (160 V), and SOT26 thermal flexibility-making it optimal for high-efficiency, high-voltage, or thermally constrained flyback designs.

Availability

ZXGD3113W6-7 is available at Aetrix Electronics and suitable for AC-DC flyback adapters, industrial power supplies, and USB PD fast chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ZXGD3113W6-7 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 high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The ZXGD3113W6-7 belongs to Diodes' synchronous rectification controller product line, engineered specifically for high-efficiency secondary-side MOSFET drive in isolated flyback converters across DCM, CrCM, and CCM modes.

FAQ

What is the recommended R_REF and R_BIAS for standard 19 V operation?

For V_CC = 19 V, R_REF = 8.2 kΩ sets I_REF ≈ 25 mA, and R_BIAS = 4.7 kΩ sets I_BIAS ≈ 100 mA - matching the test conditions in the datasheet and ensuring optimal detector gain and response time. These values are validated across -40°C to +125°C.

Can ZXGD3113W6-7 drive a 100 nF gate capacitance MOSFET at 250 kHz?

Yes - with 3 A peak sink and 1.5 A peak source capability, the ZXGD3113W6-7 delivers sufficient drive strength for 100 nF loads at 250 kHz, achieving t_FALL < 45 ns and t_RISE < 400 ns per characterization curves. Layout with short gate traces and low-inductance GND return is essential.

How does the -10 mV threshold improve efficiency versus a 25 mV controller?

A -10 mV threshold activates gate drive earlier in the conduction cycle, reducing effective forward voltage drop by ~15–20 mV across typical MOSFET R_DS(on) values. This cuts conduction loss by up to 35% at light loads and improves average efficiency by 0.8–1.3% in 5–24 V flyback designs.

Is ZXGD3113W6-7 qualified for automotive applications?

No - while rated for -40°C to +150°C junction temperature, the ZXGD3113W6-7 is not AEC-Q100 qualified and lacks automotive-specific reliability testing or PPAP documentation. It is intended for industrial and commercial power supplies, not automotive safety-critical systems.