DIODES AL17052EV1 High Voltage Step Down Converter User Guide

AL17052EV1 High Voltage Step Down Converter

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Specifications

• Parameter: Value
• AC Input Voltage: 85Vac ~ 265Vac
• Output Power: 0.25W
• Output Current: 50mA
• Output Voltage: 5V
• Efficiency: >65%@120VAC/50mA
• Dimension: 32mm*15mm
• RoHS Compliance: Yes

Product Usage Instructions

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 the power supply to the 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.

Frequently Asked Questions (FAQ)

Q: What are the key features of the AL17052EV1?

A: The AL17052EV1 is a high-voltage step-down
converter with integrated 700V MOSFET, providing accurate constant
voltage output and good dynamic performance with very few external
components.

Q: Can I use the materials in this user guide as a reference

for my own product design?

A: Yes, the bill of materials, schematic, PCB
layout, and system performance data can be used as a reference
design to improve your product’s time to market.

Q: What is the system performance of the AL17052 evaluation

board?

A: The evaluation board has excellent system
performance with high efficiency, low-load regulation rates, low
ripple, and good load-transient performance at very low BOM
costs.

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AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER

General Description
This demonstration board utilizes the AL17052 to build a cost-effective solution for high-voltage buck converter applications.
The AL17052 integrates a 700V MOSFET and can work with a single winding inductor and very few external components to provide accurate constant voltage output and good dynamic performance.
This user guide contains valuable operation information for users. Included is a bill of materials that describes the parts used on this board. A schematic and PCB layout are also included, along with measured system performance characteristics and test waveforms. These materials can be used as a reference design for your products to improve your product’s time to market.
Key Features
1. Universal 85 to 300VAC 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 appliances · IoT applications · Industrial controls · Standby power

Specifications

Parameter AC Input Voltage Output Power Output Current Output Voltage Efficiency Dimension RoHS Compliance

Value 85Vac ~ 265Vac 0.25W 50mA 5V >65%@120VAC/50mA 32mm*15mm Yes

Evaluation Board

Figure 1: Top View
Connection Instructions AC Line Input: White L line AC Neutral Input: White N line Positive Output: Vout (Red) Negative Output: Gnd (Black)

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Board Layout

AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER

Figure 2: 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 the power supply to the “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

L

0.5A

1 1L

D1 S1M

F1

C1

N 1N
1

10nf/500V D4 S1M

L1 1mH 11 22
C2 2.2uF/400V

5

1

Drain Vcc

U1

Source 2

4 Source Source 3 AL17052

C3 0.33uF

D3 S1M L2 330uH

D2 US1J

C4 47uF/10V

Figure 3: Schematic Circuit

11

Vout

R1

C5

12k

100nF

1 1

Gnd

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AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER

Bill of Materials

Qty

Ref

Value

1

F1

500mA

3 D1,D3,D4

S1M

1

D2

US1J

1

C1

10nF

1

C2

2.2uF

1

C3

0.33uF

1

C4

47uF

1

C5

100nF

1

L1

1mH

1

L2

330uH

1

R1

12k

1

U1

AL17052

2

L, N

Input line

1

Vout

Output line

1

Gnd

Output line

1

–

PCB board

AL17052 EV1 BILL OF MATERIAL

Description

Package Manufacturer

Fuse 500mA

1206

Littelfuse

Diode,1000V,1A

SOD123

Diodes

Diode,600V,1A,trr=75ns

SMA

Diodes

Ceramic Capacitor,1KV,X7R,10%

1206

FengHua

Electrolytic Capacitor,400V,6.3*10.5

SMD

AISHI

Ceramic Capacitor,25V,X7R,10%

0603

FengHua

Ceramic Capacitor,10V,X5R,20%

1206

Wurth

Ceramic Capacitor,16V,X7R,10%

0603

FengHua

Inductor,1mH,Rdc=13.8,Isat=0.07A

SMD

Wurth

Inductor,330uH,Rdc=5,Isat=0.16A

SMD

Wurth

SMD Film Resistor,1%

0603

UniOhm

IC

SOT23-5

Diodes

White color,30mm

–

–

Red color,30mm

–

–

Black color,30mm

–

–

Single layer, 15.2mm*31.9mm, 1.6mm thick, green color solder mask

Part Number 0466.500NRHF S1MSWFM US1J 1206B103K102NT EMK2GM2R2EB0D00R 0603B334K250NT 885012108012 0603B104K160NT 7445530 74455233 0603WAF1202T5E AL17052 –

System Performance
The AL17052 evaluation board has excellent system performance. With very low BOM costs, the system can achieve high efficiency, low-load regulation rates, low ripple, and good load-transient performance.

System efficiency
Figure 6 shows the measured efficiency versus load. The system efficiency at a 50mA current load could reach 65.2% with a 120VAC input and 61.2% with a 230 VAC input.

70

60

50

Efficiency(%)

40

30

120VAC

20

230VAC

10

0

10

20

30

40

50

60

IO(mA)

Figure 4: Efficiency vs Load Current

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AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER
Load Regulation The measured output voltage versus load is shown in Figure 7. The output voltage ranges from 5.32V to 4.88V, indicating a load regulation rate lower than 5%.

5.4

5.3

5.2

Vo(V)

5.1
230VAC 120VAC
5.0

4.9

4.8 0

10

20

30

40

50

60

IO(mA)

Figure 5: Output Voltage vs Load Current

Note:

Vf of D2 will make slight differences in the output voltage.

Standby Power
The measured input voltage versus standby power is shown in Figure 8. The input voltage ranges from 85V to 265V, indicating a standby power lower than 12mW.

Standby power (mW)

14 13 12 11 10
9 8 7 6 5 4
80

100 120 140 160 180 200 220 240 260 280
AC Input (V)

Figure 6: Input voltage vs No load Power
Note: If you want to lower standby power, you need to increase R1, but it will increase the no-load voltage.

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AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER
Output Ripple The output voltage ripple is measured at 50mA load at both 120VAC and 230VAC input. In Figure 8, channel 1 (in red) shows the waveform of VOUT.
Figure 7: Output Voltage Ripple with 120VAC (Left) and 230VAC (Right) The output voltage ripple peak-to-peak value is 54mV 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 a 10Hz frequency. The load switching slew rate is 50mA/s. In Figure 9, channel 2 (in red) shows the waveform of VOUT and channel 4 (in green) shows IOUT.

Figure 8: Load Transient Waveform with 120VAC (Left) and 230VAC (Right)
With 120VAC input, the maximum undershoot caused by the load transient is 700mV. With 230VAC input, the maximum undershoot caused by the load transition is 800mV. Thus, the minimum output voltage in the worst case is 4.44V.

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AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER

EMI Conduction Test
Line Terminal (Vin=120VAC, Margin>9dB)

Neutral Terminal (Vin=120VAC, Margin>9dB)

Line Terminal (Vin=230VAC,Margin>7dB)

Neutral Terminal (Vin=230VAC,Margin>7dB)

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AL17052EV1 User Guide
HIGH-VOLTAGE STEP-DOWN CONVERTER

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