DIODES AL17052EV1 High Voltage Step Down Converter User Guide
- September 6, 2024
- DIODES
Table of Contents
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
-
Ensure that the AC source is switched OFF or disconnected.
-
Connect the AC line wires of the power supply to the L and N
wires on the left side of the board. -
Connect the red terminal of the electronic load to the VOUT
wire. -
Connect the black terminal of the electronic load to the GND
wire. -
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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