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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > AC DC Converters, Offline Switches

Diodes Incorporated AP3103AKTR-G1

Name: AP3103AKTR-G1
Brand: Diodes Incorporated
SKU: AP3103AKTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3103AKTR-G1

Manufacturer:: Diodes Incorporated

Category:: AC DC Converters, Offline Switches

Package:: SOT-23-6

Datasheet:: AP3103AKTR-G1.pdf

Description:: IC OFFLINE SW FLYBACK SOT23-6

Quantity:: RFQ Add To RFQ list

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Inventory:5,600

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Product details

Overview

AP3103AKTR-G1 from Diodes Incorporated is a cost-effective, green-mode current-mode PWM controller in SOT26 package, featuring externally programmable switching frequency (65 kHz typical), 250 ns leading-edge blanking, and burst-mode operation below 20 kHz to eliminate audible noise. It delivers cycle-by-cycle OCP, VCC OVP (28.5 V), and FOCP (1.8 V) for AC-DC adapters and auxiliary power supplies.

For engineers reviewing the AP3103AKTR-G1 datasheet, AP3103AKTR-G1 pinout, AP3103AKTR-G1 application, or AP3103AKTR-G1 equivalent, key selection criteria include startup current (5 µA typ), green-mode frequency foldback, VCC maintain mode (10.2 V), soft-start time (5 ms), and SOT26 thermal resistance (250 °C/W).

Technical Context

The AP3103AKTR-G1 implements fixed-frequency current-mode control with internal slope compensation to ensure stability at >50% duty cycle. Its oscillator uses an external RI resistor to set frequency (6500/R_RI kHz), with ±6% dithering to reduce EMI peaks.

Protection logic integrates auto-recoverable OLP (32 ms delay), FOCP with 100 ns response, and pin-fault detection: FB open/short, SENSE floating, and RI short-to-ground disable PWM output. VCC maintain mode sustains regulation during light-load transients by enabling periodic switching when VCC drops near 10.2 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Startup Current	5 µA typical - enables high-value startup resistors to minimize loss in universal-input AC-DC designs
Oscillation Frequency	65 kHz typical (R_RI = 100 kΩ) - programmable via external resistor for EMI optimization
Green Mode Frequency	20–30 kHz - reduces audible noise and standby power in low-load conditions
VCC OVP Threshold	28.5 V - protects against primary-side overvoltage or opto-coupler failure
FOCP Threshold	1.8 V - provides fast secondary winding short protection with ~100 ns delay
Soft-Start Time	5 ms typical - controls inrush current and prevents transformer saturation during power-up
LEB Duration	250 ns - blanks turn-on current spike on SENSE pin to prevent false OCP triggering

Pinout & Package

SOT26 package: 6-pin, surface-mount, lead-free, RoHS-compliant, 2.82 × 3.10 × 1.45 mm body with 0.95 mm pitch; thermal resistance θ_JA = 250 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Signal ground reference	Return path for control logic and gate driver; must be low-impedance to avoid noise coupling into SENSE/FB
2 FB	Feedback input	Opto-coupler output node; regulates output voltage via 1.55 V shutdown and 4.2 V OLP thresholds
3 RI	Oscillator bias input	Resistor-to-ground sets switching frequency; sensitive to noise-requires clean layout
4 SENSE	Current sense input	Monitors MOSFET peak current; includes 250 ns LEB and FOCP comparator with 1.8 V threshold
5 VCC	Supply input	Power rail for internal circuitry; UVLO (15.5 V on / 8.6 V off) and OVP (28.5 V) protect operation
6 GATE	Gate driver output	350 mA sink/source capable; drives external MOSFET with 150 ns rise / 50 ns fall time (CL = 1 nF)

Key Features

Feature	Design Value
VCC Maintain Mode	Activates at ~10.2 V to sustain regulation during light load, reducing need for oversized VCC capacitor
Adjustable Skip Mode	Set via external resistor on RI pin to optimize efficiency vs. transient response trade-off
Auto-Recoverable OLP	Hiccup-mode restart after 32 ms fault duration-prevents thermal runaway without manual reset
Pin Fault Protection	Detects SENSE floating, FB open/short, and RI short-to-ground-disables PWM to prevent system damage
Soft Switching Control	Reduces EMI by minimizing dv/dt during switching transitions without external snubbers

Applications

AC-DC Adapter/Charger

ATX/BTX Auxiliary Power

Use Scenario: 12–19 V output adapter for notebook computers with universal AC input (90–264 VAC).

IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output via opto-coupler feedback; manages burst mode below 20 kHz to meet <30 mW no-load requirement.

Use Value: 5 µA startup current enables 2 MΩ start-up resistor, cutting standby loss by >40% vs. legacy controllers.

Use Scenario: +5 VSB rail generation in desktop PC power supplies operating continuously at <100 mW load.

IC Role / Device Role / Timing Role: Standby power controller maintaining regulation during sleep states using VCC maintain mode and frequency foldback.

Use Value: VCC maintain threshold (10.2 V) prevents brown-out restarts during step-load transients, improving system reliability.

Set-Top Box Power Supply

Open Frame Switching Power Supply

Use Scenario: Compact 5–12 V isolated supply for cable/satellite STBs with tight EMI limits (CISPR-22 Class B).

IC Role / Device Role / Timing Role: Green-mode PWM controller implementing ±6% frequency dithering and soft switching to pass conducted/radiated emissions.

Use Value: Built-in slope compensation eliminates external compensation components, reducing BOM count by 2–3 parts.

Use Scenario: Industrial open-frame PSU delivering 12–24 V at 5–15 A with overtemperature and overvoltage fault tolerance.

IC Role / Device Role / Timing Role: Core controller executing FOCP (1.8 V), OCP, and VCC OVP to protect against secondary rectifier shorts and primary overvoltage events.

Use Value: FOCP response <100 ns limits energy dissipation during fault, preventing MOSFET avalanche failure in unregulated conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PWM controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC2801DTR	Fixed 65 kHz frequency, no green-mode dithering or burst mode; higher 100 µA startup current	Lacks VCC maintain mode and FOCP-requires external OVP and additional protection circuitry	Select for cost-sensitive, fixed-frequency designs where EMI filtering is handled externally
ICE2PCS01G	Integrated PFC + PWM combo; 700 V startup capability; no SOT26 package-available only in DSO-8	Targets high-power (>100 W) applications requiring active PFC; not drop-in for standalone flyback controllers	Choose when combined PFC + PWM integration reduces board area and total system cost above 65 W

Compared with UCC2801DTR and ICE2PCS01G, the AP3103AKTR-G1 uniquely balances ultra-low startup current, integrated green-mode behavior, and SOT26 compactness-making it optimal for sub-65 W adapters where size, audible noise, and no-load efficiency are critical.

Availability

AP3103AKTR-G1 is available at Aetrix Electronics and suitable for AC-DC adapters, ATX auxiliary power supplies, and set-top box power supplies requiring stable component supply, RoHS compliance, and long-term lifecycle support.

Supply support for AP3103AKTR-G1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient solutions for power management and signal integrity.

The AP3103A belongs to Diodes' green-mode PWM controller product line, designed specifically for cost-sensitive, low-power offline AC-DC conversion in consumer and computing power supplies.

FAQ

What is the minimum recommended value for the RI resistor to achieve stable 65 kHz operation?

The datasheet specifies R_RI = 100 kΩ for 65 kHz nominal frequency. Using lower values risks exceeding max frequency (70 kHz) and degrading EMI performance. Values below 82 kΩ may cause instability due to oscillator timing margin loss and increased sensitivity to PCB noise on the RI node.

How does the VCC maintain mode interact with burst-mode operation during no-load conditions?

VCC maintain mode activates when VCC falls near 10.2 V-typically during prolonged no-load or light-load periods. It triggers brief PWM bursts independent of FB voltage, replenishing VCC without full regulation. This prevents UVLO-induced restart cycles while keeping average frequency below 20 kHz to avoid audible noise.

Can the AP3103AKTR-G1 drive a 600 V MOSFET directly without a gate driver IC?

Yes-the GATE pin sources/sinks 350 mA with 8 V high-level output (at 20 mA load), sufficient to drive standard 600 V MOSFETs with Q_g ≤ 25 nC. Layout must minimize gate loop inductance; a 10 Ω series resistor is recommended to damp ringing and limit peak current.

What failure modes does FOCP protect against, and how does its 1.8 V threshold improve safety?

FOCP detects secondary winding shorts (e.g., rectifier diode failure) by sensing abnormal current rise before main OCP triggers. Its 1.8 V threshold and <100 ns response limit fault energy to <10 µJ, preventing MOSFET avalanche breakdown and transformer insulation stress-critical for UL/IEC 62368-1 compliance.

AP3103AKTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Isolation:: Isolated

Internal Switch(s):: No

Voltage - Breakdown:: -

Topology:: Flyback

Voltage - Start Up:: 15.5 V

Voltage - Supply (Vcc/Vdd):: 10V ~ 25V

Duty Cycle:: 75%

Frequency - Switching:: 65kHz

Power (Watts):: -

Fault Protection:: Current Limiting, Over Load, Over Voltage

Control Features:: -

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Supplier Device Package:: SOT-23-6

Mounting Type:: Surface Mount

AP3103AKTR-G1 FAQ

1.How can I place an order for AP3103AKTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3103AKTR-G1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP3103AKTR-G1 reliable?

The price and inventory of AP3103AKTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3103AKTR-G1 is usually 5 days.

3.What payment methods are accepted for AP3103AKTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3103AKTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3103AKTR-G1?

AP3103AKTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3103AKTR-G1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP3103AKTR-G1?

For technical support, including AP3103AKTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3103AKTR-G1 requirements.

6.How does Aetrix verify that AP3103AKTR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3103AKTR-G1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP3103AKTR-G1 meets industry standards.

7.What is the process for return or replacement of AP3103AKTR-G1?

All AP3103AKTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3103AKTR-G1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP3103AKTR-G1 part is unused and in its original packaging.

Return procedure for AP3103AKTR-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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