Analog Devices Inc. DC1038A-A

Overview

DC1038A-A from Analog Devices (formerly Linear Technology) is a demonstration circuit board built around the LT3837 synchronous flyback PWM controller, delivering 3.3V/10A isolated output with primary-side regulation and synchronous rectification. It operates from 9–36V input, switches at 200kHz, achieves ≥88% efficiency, and provides 1500VDC isolation - designed for automotive and industrial power supply evaluation.

For engineers reviewing the DC1038A-A datasheet, DC1038A-A pinout, DC1038A-A application, or DC1038A-A equivalent, key selection considerations include its isolated flyback topology, primary-side regulation without optocoupler, synchronous rectification via pulse transformer drive, 3.3V fixed output, and compact eighth-brick footprint.

Technical Context

The DC1038A-A implements a primary-side regulated isolated flyback converter using the LT3837 controller, which senses output voltage indirectly via the transformer's auxiliary winding during flyback time-eliminating need for optocoupler or secondary-side feedback components. Regulation accuracy is ±1.2% over line and load (9–36V, 0–10A), with output ripple ≤20mVP–P at 18VIN/10AOUT.

It employs burst-mode operation under light load and "burp-mode" protection during overload or short-circuit, where VCC decay to 7.0V triggers shutdown to limit dissipation. Synchronous rectification is driven by the LT3837's SG signal, transmitted via pulse transformer T2 and buffered on the secondary side.

Key Specifications

Availability

DC1038A-A is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC I/O module power rails, and isolated sensor interface converters requiring stable component supply and proven reference design validation.

Supply support for DC1038A-A 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

Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio. The company specializes in precision signal conditioning, power conversion, and reliable mixed-signal ICs for demanding applications.

The DC1038A-A belongs to Linear's demonstration circuit series for DC/DC controllers, specifically developed to validate the LT3837's capability in compact, isolated, optocoupler-free flyback designs targeting automotive and industrial environments.

FAQ

What is the purpose of the DC1038A-A demonstration circuit?

The DC1038A-A is a fully assembled evaluation board that demonstrates the LT3837 synchronous flyback controller in an isolated 3.3V/10A power supply. It validates primary-side regulation, synchronous rectification timing, thermal performance under airflow, and compliance with 1500VDC isolation - enabling rapid prototyping and design-in verification of the DC1038A-A in real-world systems.

Does the DC1038A-A require an optocoupler for regulation?

No. The DC1038A-A uses primary-side regulation via the LT3837's sensing of the transformer's housekeeping winding voltage during flyback time. This eliminates the need for an optocoupler or secondary-side TL431 circuit, reducing component count, improving reliability, and simplifying layout - a core feature validated on the DC1038A-A.

What input voltage range does the DC1038A-A support, and why is this important?

The DC1038A-A supports 9V to 36V input, covering nominal 12V and 24V automotive and industrial bus ranges including cold-crank (down to ~6V) and load-dump transients (up to 40V with derating). This wide range ensures robust operation across vehicle battery fluctuations and factory automation power rails - a key specification confirmed in the DC1038A-A performance summary.

How is synchronous rectification implemented on the DC1038A-A?

Synchronous rectification on the DC1038A-A is driven by the LT3837's SG (Synchronous Gate) output, transmitted via pulse transformer T2 to the secondary-side MOSFET gate. This precise timing avoids shoot-through and maximizes conduction efficiency - directly contributing to the DC1038A-A's measured 88% peak efficiency at full load.

Can the DC1038A-A be used for design-in without modification?

The DC1038A-A is intended as a functional reference design, not a drop-in production module. While its schematic and layout are provided for reuse, production use requires validation of thermal performance under target airflow (200LFM specified), input/output filtering for EMI compliance, and safety certification for end-equipment - all documented in the DC1038A-A quick start guide and performance summary.