DIODES AL17051V5EV1 High-Voltage Step-Down Converter User Guide

AL17051V5EV1 User Guide
High-Voltage, Step-Down Converter

General Description

This demonstration board utilizes the AL17051V5 to build a cost-effective solution for high-voltage buck converter applications. AL17051V5 integrates a 700V MOSFET and works with a single winding inductor and very few external components to provide accurate constant voltage output and good dynamic performance. A bill of materials is included in this user guide which describes the parts used on this board.
A schematic and PCB layout is also included along with measured system performance characteristics and test waveforms. These materials can be used as a reference design for products to improve the product’s time to market.

Key Features

1. Universal 85 to 265VAC Input Range
2. Constant Voltage (CV) Control
3. Internal MOSFET up to 700V
4. Low Operation Current: 100µA (Static)
5. Undervoltage Lock Out (UVLO)
6. Output Short Protection
7. Overload Protection
8. Overtemperature Protection (OTP)
9. Lower Standby Power

Applications

• Home Appliance Applications
• IoT Applications
•  Industrial Controls
• Low Standby Power Applications

Specifications

Evaluation Board

Connection Instructions:
AC Line Input: White L line
AC Neutral Input: White N line
Positive Output: Vout (Red)
Negative Output: Gnd (Black)

Board Layout

Quick Start Guide

1. Ensure that the AC source is switched OFF or disconnected.
2. Connect the AC line wires of power supply to “L” and “N” wires on the left side of the board.
3. Connect the red terminal of the electronic load to the “Vout” wire.
4. Connect the black terminal of the electronic load to the “Gnd” wire.
5. Turn on the main switch. The electronic load should show a 5V output.

Schematic

Bill of Material

System Performance

The AL17051V5 evaluation board has excellent system performance. With very low BOM cost, the system can achieve high efficiency, low load regulation rate, low ripple and good load transient performance.
System efficiency
Figure 6 shows the measured efficiency versus load. The system efficiency at 55mA current load could reach 71.4% with 120Vac input and 66.7% with 230Vac input.

Load Regulation
The measured output voltage versus load is shown in Figure 7. The output voltage ranges from 5.34V to 4.95V, indicating the load regulation rate lower than 8%.

Note: Forward voltage drop of D2 will make slight differences on the output voltage. Heavy dummy load (R1) also helps to decrease output voltage at no load condition.
Standby Power
The measured input voltage versus standby power is shown in Figure 8. The input voltage ranges from 85V to 265V, indicating the standby power lower than 10mW.

Note: If want to lower standby power, need to increase R1 value, but need to double check output voltage at no-load condition.
Output Ripple
The output voltage ripple is measured at 60mA load at both 120Vac and 230Vac input. In Figure 9, channel 1 (Red color) shows the waveform of Vout.

The output voltage ripple peak to peak value is 42mV for 120Vac input and 47mV for 230Vac.
Load Transient Response
The load transient response is tested with the load repeatedly switching from 0mA to 60mA in 10Hz frequency. The load switching slew rate is 60mA/us. In Figure 10, channel 2 (Red color) shows the waveform of Vout and channel 4 (Green color) shows Iout.

With 120Vac input, the maximum undershoot caused by the load transient is 414mV. With 230Vac input, the maximum undershoot caused by the load transition are 484mV. Thus, the minimum output voltage in worst case is 4.72V.
EMI Conduction Test

IMPORTANT NOTICE

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2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes’ products described herein and application examples. Diodes does not assume any liability arising out of the applicati on or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. Diodes’ products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for
   (a) selecting the appropriate Diodes products for their applications,
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   (d) ensuring they design with appropriate safeguards (including testing, validation, quality control t echniques, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications.

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www.diodes.com
AL17051V5
March 2023
www.diodes.com

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