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Diodes Incorporated AP3125AEV1
- Part No.:
- AP3125AEV1
- Manufacturer:
- Diodes Incorporated
- Package:
- Datasheet:
-
AP3125AEV1.pdf
- Description:
- EVAL BOARD FOR AP3125A
- Quantity:
- Payment:
- Shipping:
Inventory:1,638
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Product details
Overview
AP3125AEV1 from Diodes Incorporated is a current-mode PWM controller IC designed for offline flyback AC-DC converters, featuring fixed 65 kHz switching frequency, green-mode frequency foldback (down to ~20 kHz), burst-mode operation at light/no load, internal slope compensation, and comprehensive protection including cycle-by-cycle OCP, VCC OVP (28.5 V), OTP (150 °C), and FOCP with 100 ns response. It targets cost-sensitive, low-standby-power applications such as notebook adapters and STB power supplies.
For engineers reviewing the AP3125AEV1 datasheet, AP3125AEV1 pinout, AP3125AEV1 application, or AP3125AEV1 equivalent, key selection criteria include its green-mode efficiency optimization, SOT26 package footprint, integrated VCC maintain function for stable light-load operation, and latch-capable CTRL pin for configurable fault recovery behavior.
Technical Context
The AP3125AEV1 implements peak-current-mode control with built-in 250 ns leading-edge blanking and programmable slope compensation, enabling stable operation up to 75% duty cycle across universal input (90–265 VAC). Its oscillator integrates ±6% frequency dithering to reduce EMI peaks and supports auto-recoverable OLP and VOVP, plus optional latch-mode protection via the CTRL pin.
Feedback regulation is achieved through the FB pin interfacing with an opto-coupler, where VFB thresholds (1.55 V shutdown, 4.5 V hiccup trigger) directly govern output short-circuit response. The SENSE pin monitors primary-side current with 0.95 V typical threshold and includes FOCP at 1.7 V for secondary winding short detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 65 kHz nominal; reduces to ~20–30 kHz in green mode to boost mid-load efficiency without audible noise |
| VCC UVLO Thresholds | Turn-on at 15.8 V, turn-off at 7.6 V - ensures reliable startup from bulk capacitor and graceful shutdown during brownout |
| SENSE Pin Threshold | 0.95 V typical - sets peak primary current limit; enables precise overcurrent protection independent of input voltage |
| FB Pin Protection Thresholds | 1.55 V (immediate shutdown), 4.5 V (70 ms delayed hiccup) - provides dual-level output short-circuit response |
| GATE Drive Capability | 350 mA sink/source - sufficient to drive medium-size MOSFETs directly without external buffer in <65 W designs |
| Startup Current | 10 μA max - allows high-value startup resistors (>1 MΩ), minimizing standby power loss in high-voltage AC inputs |
| Thermal Shutdown | 150 °C trip, 125 °C release - auto-recovering OTP protects against sustained overload or poor heatsinking |
Pinout & Package
SOT26 (K package), 6-pin surface-mount package with 2.82 mm × 2.65 mm footprint, matte tin-plated leads, moisture sensitivity level 3, and 0.016 g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Signal ground reference | Return path for internal bias, gate driver, and control logic; must be low-impedance connection to power ground plane |
| 2 FB | Opto-coupler feedback input | Regulates output voltage by modulating duty cycle; 1.55 V shutdown and 4.5 V hiccup thresholds enable robust short-circuit handling |
| 3 CTRL | Latch trigger / OTP interface | Configurable low/high-threshold latch (1 V / 3 V); connecting NTC to GND enables thermal shutdown; open for disable |
| 4 SENSE | Primary current sense input | Detects MOSFET current via sense resistor; includes 250 ns leading-edge blanking and 1.7 V FOCP for secondary short protection |
| 5 VCC | IC supply input | Powered by auxiliary winding; UVLO (7.6–15.8 V) and OVP (28.5 V) ensure safe operation; VCC maintain mode sustains supply at light load |
| 6 GATE | High-current MOSFET gate driver output | 350 mA capable push-pull stage; 150 ns rise / 100 ns fall time into 1 nF load; clamped at 13 V to protect external MOSFET gate |
Key Features
| Feature | Design Value |
|---|---|
| Green-mode frequency foldback | Reduces switching frequency under partial load to maintain >75% efficiency at 20–50% load without acoustic noise |
| Integrated VCC maintain function | Activates gate drive pulses when VCC drops near UVLO to replenish hold-up capacitor, eliminating unwanted restarts during step loads |
| FOCP with 100 ns delay | Fast secondary winding short detection prevents catastrophic failure during rectifier short events in flyback transformers |
| Programmable latch via CTRL pin | Supports either low-level (1 V) or high-level (3 V) trigger for system-level fault latching - eliminates need for external supervisor IC |
| Internal line compensation | Maintains constant output power limit across 90–265 VAC input range without external components |
Applications
| USB-C Notebook Adapter | ATX Auxiliary Power Supply |
|---|---|
|
Use Scenario: 45 W USB-C PD adapter with universal AC input (90–265 VAC) and tight no-load standby requirement (<75 mW). IC Role / Device Role / Timing Role: Primary-side PWM controller managing flyback topology, regulating 5/9/15/20 V outputs via opto-coupler feedback and enabling burst mode below 50 mW load. Use Value: Ultra-low 10 μA startup current and VCC maintain mode ensure reliable startup and stable light-load regulation while meeting DOE VI/ERP Tier 2 standby limits. |
Use Scenario: +5 VSB rail in desktop ATX PSUs requiring fast transient response and robust short-circuit immunity. IC Role / Device Role / Timing Role: Standby power controller driving small flyback transformer; uses FB pin hiccup mode and SENSE FOCP to survive sustained output shorts. Use Value: Dual-level FB protection (1.55 V immediate cutoff + 4.5 V delayed hiccup) prevents thermal runaway during connector short events without sacrificing startup reliability. |
| Set-Top Box Power Supply | Open-Frame Industrial Charger |
|
Use Scenario: 12 V/1 A open-frame PSU for cable/satellite STB with wide ambient temperature range (−20 °C to +70 °C). IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller with internal slope compensation ensuring stable operation across line/load variations and temperature extremes. Use Value: ±5% frequency stability over −20 °C to +125 °C and built-in slope compensation eliminate external compensation components and reduce design iteration cycles. |
Use Scenario: 24 V/2 A industrial battery charger operating in unregulated environments with frequent line sags and surges. IC Role / Device Role / Timing Role: Primary-side controller implementing VCC OVP (28.5 V) and auto-recoverable OLP to sustain operation during brownouts and prevent latch-up during surge events. Use Value: VCC clamp at 34 V and 28.5 V OVP threshold protect against rectifier-stage transients, enabling direct integration without Zener clamping networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3105NA | Same SOT26 package and pinout; lacks VCC maintain mode and has fixed 65 kHz only (no green mode) | Suitable for simpler, lower-cost adapters where light-load efficiency is less critical | Select when BOM cost reduction outweighs 30–50 mW standby savings and step-load stability is not required |
| OB2262 | Higher 70 kHz base frequency; no integrated FOCP or CTRL latch; requires external soft-start capacitor | Better suited for higher-power (>65 W) flyback designs with tighter EMI requirements | Prefer when designing for >60 W output with stricter conducted EMI limits and external thermal monitoring is acceptable |
Compared with AP3105NA and OB2262, the AP3125AEV1 uniquely combines green-mode efficiency, VCC maintain functionality, and dual-threshold CTRL latch in a single SOT26 package-enabling compact, ultra-low-standby designs without compromising robustness or thermal safety.
Availability
AP3125AEV1 is available at Aetrix Electronics and suitable for USB-C notebook adapters, ATX auxiliary supplies, set-top box power supplies, and open-frame industrial chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AP3125AEV1 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 power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.
The AP3125A belongs to Diodes' Green Mode PWM Controller product line, engineered specifically for cost-sensitive, high-efficiency offline flyback converters in AC-DC adaptors, chargers, and auxiliary power supplies.
FAQ
What is the purpose of the CTRL pin on the AP3125AEV1?
The CTRL pin provides configurable fault protection: it supports low-threshold (1 V) or high-threshold (3 V) latch triggering for system-level shutdown, and accepts an NTC thermistor connected to GND to implement thermal shutdown. Leaving it open disables latch functionality while retaining other protections.
How does the VCC maintain mode improve light-load performance?
VCC maintain mode activates gate drive pulses when VCC drops near the UVLO turn-off threshold (7.6 V), allowing energy transfer to recharge the VCC capacitor. This prevents unintended shutdown/restart cycles during light or step loads, improving output regulation stability and reducing audible noise in burst mode.
Can the AP3125AEV1 replace the AP3105NA without circuit changes?
Yes - the AP3125AEV1 is pin-to-pin compatible with AP3105NA/NV/NL/NR and shares identical SOT26 pinout and basic functional blocks. However, its added VCC maintain mode and green-mode frequency foldback may require minor loop compensation adjustments to optimize light-load transient response.
What protection features are auto-recoverable versus latch-type?
Auto-recoverable protections include VCC OVP (28.5 V), OLP (hiccup at FB = 4.5 V), and OTP (150 °C enter / 125 °C exit). Latch-type protection is optional and enabled only when the CTRL pin is configured for low/high-level trigger - once activated, it holds until AC input is cycled.
AP3125AEV1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- AC/DC, Primary Side
- Outputs and Type:
- 1 Isolated Output
- Voltage - Output:
- -
- Current - Output:
- -
- Voltage - Input:
- -
- Regulator Topology:
- -
- Frequency - Switching:
- Flyback
- Contents:
- 65kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- AP3125A
AP3125AEV1 FAQ
1.How can I place an order for AP3125AEV1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3125AEV1 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 AP3125AEV1 reliable?
The price and inventory of AP3125AEV1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3125AEV1 is usually 5 days.
3.What payment methods are accepted for AP3125AEV1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3125AEV1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3125AEV1?
AP3125AEV1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3125AEV1 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 AP3125AEV1?
For technical support, including AP3125AEV1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3125AEV1 requirements.
6.How does Aetrix verify that AP3125AEV1 is sourced from the original manufacturer or authorized distributors?
All AP3125AEV1 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 AP3125AEV1 meets industry standards.
7.What is the process for return or replacement of AP3125AEV1?
All AP3125AEV1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3125AEV1, 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 AP3125AEV1 part is unused and in its original packaging.
Return procedure for AP3125AEV1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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