Diodes Incorporated AL17150EV1

Overview

AL17150EV1 from Diodes Incorporated is an evaluation board for the AL17150 high-voltage buck converter IC, integrating a 500V MOSFET and supporting universal 85–265V_AC input to deliver regulated 3.3V/300mA output with >52% efficiency and <75mW standby power. It serves as a reference design for cost-sensitive, low-power offline AC/DC conversion in compact IoT and home appliance power supplies.

For engineers reviewing the AL17150EV1 datasheet, AL17150EV1 pinout, AL17150EV1 application, or AL17150EV1 equivalent, this board enables rapid validation of AL17150-based buck topologies, including system-level efficiency, load transient response (±280–420mV undershoot), EMI compliance (EN55015 pass margin ≥4.6dB), and protection behavior (OTP, OLP, open-loop, short-circuit).

Technical Context

The AL17150EV1 implements a primary-side controlled, constant-voltage flyback-derived buck converter using the AL17150 IC - a monolithic 500V HVIC with internal MOSFET, UVLO (12.5V turn-on / 8.5V turn-off), and integrated protections. It operates in discontinuous conduction mode (DCM) with fixed-frequency PWM control.

System-level performance is defined by external passive selection: two 1mH inductors (L1, L2), 2.2µF/400V and 330µF/16V electrolytics (C1/C2, C4), and feedback network (R1 = 3.01kΩ, R2 = 5.6kΩ) setting 3.3V output. No optocoupler or secondary-side sensing is required.

Key Specifications

Availability

AL17150EV1 is available at Aetrix Electronics and suitable for IoT sensor node power supplies, smart home appliance standby rails, and industrial control auxiliary power requiring stable component supply, fast prototyping turnaround, and regulatory-compliant reference designs.

Supply support for AL17150EV1 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 industrial, computing, and consumer markets.

The AL17150EV1 belongs to Diodes' high-voltage AC/DC evaluation platform family, designed to accelerate development of ultra-low-cost, no-opto offline converters for sub-1W applications where size, BOM count, and regulatory compliance are critical.

FAQ

What is the purpose of the dual inductor configuration (L1 and L2) on AL17150EV1?

L1 (77F102J-RC) and L2 (RLB0912) form a coupled inductor structure that functions as a single-winding high-voltage buck choke. L1 provides main energy storage while L2 adds leakage inductance damping to reduce EMI and improve load transient stability - confirmed by measured 95mV ripple and <420mV undershoot during 0–350mA switching.

Does AL17150EV1 support constant-current (CC) regulation?

No. The AL17150EV1 implements constant-voltage (CV) regulation only, per the AL17150 IC's architecture. Its feedback loop uses a resistive divider (R1/R2) to sense V_OUT; no current-sense resistor or CC control path is present in the schematic or BOM. Protection features (OLP, OTP) respond to overloads but do not regulate output current.

How is EMI performance achieved with minimal filtering components?

EMI suppression relies on the AL17150's frequency-jittering PWM controller, optimized transformer-less layout, and strategic placement of C1/C2 (X-capacitors), FR1 (fuse resistor), and D1–D4 (bridge rectifier + snubbing diodes). Measured conduction emissions passed EN55015 with -4.6dB margin at 230V_AC, validating the design's self-shielding capability.

Can AL17150EV1 be modified to deliver 5V output?

Yes - by recalculating the feedback resistor divider (R1/R2) to scale the 0.6V internal reference to 5V. For example, replacing R2 (5.6kΩ) with ~12.3kΩ yields ~5.0V output. All other components (inductors, capacitors, MOSFET stress margins) remain valid, as the AL17150's 500V rating and 300mA capability accommodate the change without hardware revision.