DIODES AL17051V33EV1 High-Voltage Step-Down Converter User Guide

DIODES AL17051V33EV1 High-Voltage Step-Down Converter

AL17051V33EV1 User Guide

High-Voltage, Step-Down Converter

The AL17051V33EV1 is a cost-effective solution for high-voltage buck converter applications. It integrates a 700V MOSFET and works with a single, winding inductor and minimal external components to provide accurate constant voltage output and good dynamic performance. This product is suitable for home appliance applications, IoT applications, industrial controls, and low standby power applications.

Key Features

• 700V MOSFET integrated
• Single winding inductor
• Minimal external components
• Accurate constant voltage output
• Good dynamic performance

Specifications

Board Layout

Refer to the user manual for the top and bottom view of the PCB
layout.

Connection Instructions

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

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 3.3V output.

Bill of Material

The bill of materials is included in the user manual, which describes the parts used on this board. Refer to the user manual for details.

System Performance:

The AL17051V33 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.

General Description

This demonstration board utilizes the AL17051V33 to build a cost-effective solution for high-voltage buck converter applications.
AL17051V33 integrates a 700V MOSFET and works with a single, winding inductor and minimal 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 their 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 Lockout (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

Figure 3. PCB Layout Top View

Figure 4. PCB Layout Bottom View

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 3.3V output.

Schematic

Figure 5. Schematic Circuit

Bill of Material

System Performance

The AL17051V33 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 output loading. The system efficiency at 55mA current load could reach 65.7% with 120Vac input and 62.5% with 230Vac input.

Figure 6. Efficiency vs. Output Loading:
Load Regulation
The measured output voltage versus load is shown in Figure 7. The output voltage ranges from 3.43V to 3.17V, indicating the load regulation rate is lower than 8%.
Figure 7. Output voltage vs. load current:

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 is lower than 13mW.

Figure 8. Input voltage vs. No load Power:

Note : To lower standby power, the R1 value must be increased, but output voltage at no-load condition must be checked.
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.
Figure 9. Output voltage ripple with 120Vac (Left) and 230Vac (Right ):

The output voltage ripple peak to peak value is 52mV for 120Vac input and 64mV 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.

Figure 10. Load transient waveform with 120Vac (Left) and 230Vac (Right) :

With 120Vac input, the maximum undershoot caused by the load transient is 444mV. With 230Vac input, the maximum undershoot caused by the load transition are 480mV. Thus, the minimum output voltage in worst case is 2.99V.

EMI Conduction Emission Test (EN55022)

Line Terminal
(Vin=230VAC,Margin>9dB):

Neutral Terminal
(Vin=230VAC,Margin>9dB):

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