DIODES AP3125A Dual Output Smart Power Adaptor User Guide

DIODES AP3125A Dual Output Smart Power Adaptor

USER GUIDE

General Description

Based on flyback topology, the AP3125A EV1 board is designed to serve as an example for cost-effective power solutions suitable for IoT applications. Rated at 25W power output, AP3125A EV1 board accepts universal AC voltage input while delivers 12V@2A and 5V@0.2A for IoT main functions as well as for IoT connectivity. The AP3125A EV1 meets DOE VI and CoC Tier 2 energy efficiency requirement with standby power lower than 0.2W.

Key Features

• 90 ~265VAC input range
• Current mode control & 65KHz operation switching frequency
• Over 85% Efficiency
• Very low standby input power <0.2W
• Low start-up operating and quiescent currents
• Soft start during startup process.
• Working at CCM mode when AC input is lower and at DCM mode when AC input is higher
• Frequency fold back for high average efficiency
• Built-in Jittering Frequency
• Soft Switching for Reducing EMI
• Internal Auto Recovery OCP, OVP, OLP, OTP Power Protection, cycle by cycle current limit, also with DC polarity protection

Applications

• Switching AC-DC Adaptor & Charger
• Power home Appliances
• Set-top box power supply
• Open frame switching power supply
• Gaming system

AP3125A universal AC input EV1 Specifications (CV mode)

Evaluation Board

AP3125 (90 VAC ~ 230VAC 2 outputs 25W Transformer Spec.)

1. Core& Bobbin: RM8, 6+6 pin

2. Transformer Parameters
   1. Primary Inductance (Pin1-Pin6), all other windings are open
   Lp = 0.85mH ± 5 %@1KHz

3. Transformer Winding Construction Diagram

Pin 2.
2| Insulation| 1 Layer of insulation tape
3| Shielding Winding| Start from Pin 4, 34# AWG2 with full layer winding, end flowing wire.
4| Insulation| 1 Layer of insulation tape
5| WD2 Aux Winding| Start from Pin 5, 32# AWG x2, 11TsT one layers, end at Pin 4.
6| Insulation| 2 Layers of insulation tape
7| WD3      NS1      Secondary
Winding| Start from FL1 with white tube, triple of insulation 26# AWG2, 8Ts, one layer,
end fold back to top side with black tube.
8| WD4      NS2      Secondary Winding| Start from FL3, triple of insulation 32# AWG2, 4Ts, one layer, end fold back to top side with FL4 with black tube.
9| Insulation| 2 Layers of insulation tape
10| WD5-Primary Winding| Start from Pin 2, 28# AWG1, 26Ts, Two layers, end at Pin 6.
11| Insulation| 2 Layers of insulation tape

Evaluation Board Schematic

Figure 3: Evaluation Board Schematic

Evaluation Board Layout

Quick Start Guide

1. The evaluation board is preset at 12V/2A from TH1 ~TH3 & 5V/0.2A from TH2~TH3
2. Ensure that the AC source is switched OFF or disconnected.
3. Connect the AC line wires of power supply to “L and N” on the left side of the board.
4. Turn on the AC main switch.
5. Measure TH1~TH3 and TH2~TH3 to ensure correct output voltages at 12V and 5V, respectively.

Build of Material:

Input & Output Characteristics

Input Standby Power

Input power Efficiency at different loading

Output Characteristics:

Line Regulation (at full loading condition):

Cross Load Regulation (at nominal line AC input voltage):

Current setting with at different AC line

Note: All output voltages are measured at output PCB board Edge.

Key Performance Waveforms:

Note: All output voltages are measured at output PCB board Edge.

Key Performance Waveforms:

Please see the recommand Application note for reference (Web page – http://www.diodes.com/appnote_dnote.html)

1. For AP3125 operation & set up, please review the Application note:
   Application note 1120 Green Mode PWM Controller
2. For PSU PCB layout consideration, please review the App note: AN1062 High Voltage Green Mode PWM Controller AP3105
3. For the basic Flyback topology calculation, please review the App note: AN1045 Design Guidelines for Off-line AC-DC Power Supply Using BCD. PWM Controller AP3103
   Thermal Test data at room Temperature after running 1 hr

IMPORTANT NOTICE

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LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2016, Diodes Incorporated

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Specifications:

• Input Voltage Range: 90 ~ 265VAC

• Output Voltage: 12V @ 2A, 5V @ 0.2A

• Power Output: 25W

• Efficiency: Over 85%

• Standby Power: Lower than 0.2W

• Protections: OCP, OVP, OLP, OTP

• Dimensions: 69 x 42 x 24 mm

FAQ:

Q: What is the input voltage range of the AP3125A EV1 board?

A: The input voltage range is 90 ~ 265VAC.

Q: What are the output voltages of the AP3125A EV1 board?

A: The board delivers 12V @ 2A and 5V @ 0.2A.

Q: What are the dimensions of the AP3125A EV1 board?

A: The dimensions are 69 x 42 x 24 mm.

Q: Does the AP3125A EV1 board meet energy efficiency requirements?

A: Yes, it meets DOE VI and CoC Tier 2 energy efficiency requirements with standby power lower than 0.2W.

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