Analog Devices Inc./Maxim Integrated MAX5022EVKIT

Overview

MAX5022EVKIT from Maxim Integrated is an evaluation kit designed to demonstrate and validate the MAX5022 75% duty-cycle current-mode PWM controller in universal-input isolated flyback power supplies. It implements a 5V/1A output from 85VAC–265VAC input, features a 262kHz fixed switching frequency, 75% maximum duty cycle, and supports optocoupler-based feedback with TLV431 shunt regulator for precise voltage regulation.

For engineers reviewing the MAX5022EVKIT datasheet, MAX5022EVKIT board layout, MAX5022EVKIT application circuit, or MAX5022EVKIT component selection, this kit provides a fully assembled, tested reference design enabling rapid prototyping of compact, high-efficiency offline standby and isolated DC-DC converters meeting safety-critical industrial and telecom requirements.

Technical Context

The MAX5022EVKIT implements a discontinuous conduction mode (DCM) flyback topology using the MAX5022 IC, which integrates UVLO with 24V wakeup/10V shutdown thresholds, 60ns cycle-by-cycle current-limit response, and internal 9V VCC regulator. The board uses IRFRC20 N-channel MOSFET, CNY17-3 optocoupler, and TLV431 shunt regulator to close the isolated feedback loop.

It validates key system-level behaviors including startup sequence (C2/C3 charge timing), tertiary-winding bias supply stability, overcurrent protection via RCS = 1.78Ω, and thermal performance under full-load conditions across -40°C to +85°C ambient - all aligned with the MAX5022's specified operating range and electrical characteristics.

Key Specifications

Availability

MAX5022EVKIT is available at Aetrix Electronics and suitable for universal off-line power supplies, isolated telecom DC-DC converters, and standby power applications requiring stable component supply, pre-validated safety-compliant layout, and rapid functional verification.

Supply support for MAX5022EVKIT 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.

The MAX5022EVKIT belongs to Maxim's power management evaluation platform family, engineered specifically to accelerate development of isolated AC-DC and DC-DC converters using their current-mode PWM controllers - emphasizing ease of validation, safety compliance, and design reuse.

FAQ

What is the primary function of the MAX5022EVKIT?

The MAX5022EVKIT is a fully assembled evaluation kit that demonstrates the operation of the MAX5022 current-mode PWM controller in a universal-input 5V/1A isolated flyback power supply. It provides a working reference design with validated component values, PCB layout, thermal behavior, and safety isolation - enabling engineers to verify performance, debug system integration, and accelerate time-to-prototype without designing from scratch.

Does the MAX5022EVKIT include the MAX5022 IC?

Yes, the MAX5022EVKIT includes a populated MAX5022 IC (in 6-pin SOT23 package) as the core controller. The board implements the complete functional circuit shown in Maxim's Typical Operating Circuit (Figure 1), including the IRFRC20 MOSFET, CNY17-3 optocoupler, TLV431 shunt regulator, and all supporting passives - allowing immediate power-up and measurement of VIN, VCC, NDRV, and output regulation behavior.

Can the MAX5022EVKIT be used for telecom (-36VDC to -72VDC) input applications?

No - the MAX5022EVKIT is configured exclusively for universal AC input (85VAC–265VAC). While the MAX5022 IC itself supports telecom DC inputs per its datasheet, the EVKIT's transformer (CTX03-15256), startup resistor network, and input rectification are optimized for AC line operation. For telecom use, a custom board implementing Figure 4 from the MAX5022 datasheet is required.

What output voltage accuracy does the MAX5022EVKIT achieve?

The MAX5022EVKIT achieves ±2% output voltage accuracy at 5V/1A under nominal line and load conditions, primarily determined by the 1% tolerance of R4 (24.9kΩ) and R5 (8.06kΩ) feedback divider and the 1.24V reference tolerance of the TLV431AIDBV shunt regulator. Load regulation remains within ±3% from no-load to full-load, consistent with the MAX5022's optocoupler feedback architecture and bandwidth limitations.

Is the MAX5022EVKIT RoHS compliant and lead-free?

Yes, the MAX5022EVKIT is RoHS compliant and uses lead-free solder and components in accordance with Analog Devices' (formerly Maxim) product environmental standards. All bill-of-materials components, including the MAX5022 IC, IRFRC20 MOSFET, and TLV431AIDBV, carry active lead-free part numbers and meet JEDEC J-STD-609 Category 1 marking requirements.