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Diodes Incorporated AP3105NAKTR-G1
- Part No.:
- AP3105NAKTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-6
- Datasheet:
-
AP3105NAKTR-G1.pdf
- Description:
- IC OFFLINE SW FLYBACK SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,368
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Product details
Overview
AP3105NAKTR-G1 from Diodes Incorporated is a current-mode PWM controller IC for offline AC-DC power supplies, featuring 65 kHz nominal switching frequency, green-mode burst operation down to 20 kHz, cycle-by-cycle overcurrent protection (OCP), VCC overvoltage protection (VOVP) at 28.5 V, and integrated slope compensation. It targets cost-sensitive adapter/charger designs requiring low standby loss and audible-noise suppression.
For engineers reviewing the AP3105NAKTR-G1 datasheet, AP3105NAKTR-G1 pinout, AP3105NAKTR-G1 application, or AP3105NAKTR-G1 equivalent, key selection criteria include UVLO thresholds (15.5 V turn-on / 8.6 V turn-off), adjustable skip mode via external resistor, latch-type OTP/OVP response, and SOT-23-6 package compatibility with AP3103.
Technical Context
The AP3105NAKTR-G1 implements fixed-frequency current-mode control with frequency dithering (±6% typical) to reduce EMI, and transitions to burst mode below ~20 kHz under light load to suppress audible noise and minimize standby loss. Its internal 250 ns leading-edge blanking prevents false OCP triggering during MOSFET turn-on spikes.
Protection architecture includes auto-recoverable OLP and VOVP, latch-mode OTP via CTRL pin (0.5 V low-threshold / 2.5 V high-threshold), and fault detection for FB open/short, SENSE floating, and CTRL short-to-ground - all coordinated through a single-cycle PWM latch and 64 ms OLP delay timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 65 kHz typical; ±6% dithering reduces EMI peak amplitude |
| Green Mode Frequency | 20–30 kHz range avoids audible noise while maintaining regulation |
| Startup Current | 5 μA typical; enables high-value startup resistors to cut dissipation in universal-input AC-DC |
| VCC UVLO Thresholds | 15.5 V turn-on / 8.6 V turn-off; ensures stable start-up and graceful shutdown across temperature |
| OCP Threshold | 0.95 V on SENSE pin; sets peak inductor current limit with cycle-by-cycle enforcement |
| CTRL Latch Thresholds | 0.5 V (low) / 2.5 V (high); configurable thermal or overvoltage latch using NTC or voltage divider |
| VCC Clamp Voltage | 34 V maximum; protects internal regulator during transient overvoltage events |
Pinout & Package
SOT-23-6 package with 2.82 mm × 2.65 mm footprint, 1.7 mm height, and gull-wing leads; optimized for compact flyback controller layouts with thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Signal ground reference | Return path for gate driver, bias, and sensing circuits; must be low-impedance local star point |
| 2 FB | Feedback input | Opto-coupler output connection; regulates output voltage by modulating duty cycle when >1.55 V or <4.2 V |
| 3 CTRL | Latch trigger input | Configurable OTP/OVP latch: pulled low (<0.5 V) or high (>2.5 V) to disable output until AC reset |
| 4 SENSE | Current sense input | Monitors primary-side current via shunt resistor; includes 250 ns blanking to reject MOSFET turn-on spike |
| 5 VCC | Supply input | Power rail for internal bias and gate driver; maintains 10.2 V regulation during light load via VCC maintain mode |
| 6 GATE | Gate driver output | Push-pull driver capable of 350 mA sink/source; 150 ns rise / 100 ns fall into 1 nF load |
Key Features
| Feature | Design Value |
|---|---|
| Frequency foldback | Reduces switching frequency under light load to improve average efficiency without compromising regulation |
| VCC maintain mode | Activates auxiliary switching to recharge VCC capacitor during step-load transients, preventing unintended UVLO restarts |
| FOCP secondary protection | 1.8 V fast OCP threshold with 100 ns delay detects secondary winding shorts before catastrophic failure |
| Soft-start time | 5 ms typical ramp-up of duty cycle prevents inrush current and transformer saturation at power-on |
| Pin fault immunity | Disables PWM if FB open/short, SENSE floating, or CTRL shorted to ground - no external supervision required |
Applications
| AC-DC Adapter/Charger | ATX/BTX Auxiliary Power |
|---|---|
Use Scenario: 12 V/2 A wall adapter for portable electronics with universal AC input (90–265 VAC). IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output via opto-coupler feedback; manages burst-mode transition at <10% load. Use Value: 20 kHz minimum switching frequency eliminates audible coil whine; 5 μA startup current enables 2 MΩ startup resistor to cut standby loss by >30 mW. | Use Scenario: +5 VSB rail in desktop PC power supply delivering 2.5 A at <0.5 W no-load consumption. IC Role / Device Role / Timing Role: Standby power controller operating in green-mode burst; coordinates with main PFC stage via VCC maintain function. Use Value: VCC maintain mode sustains regulation during 100 ms load steps without dropout; UVLO hysteresis prevents cycling near 8.6 V shutdown threshold. |
| Set-top Box Power Supply | Open Frame Switching Power Supply |
Use Scenario: 12 V/3 A embedded power module for cable/satellite STB with thermal derating up to 70°C ambient. IC Role / Device Role / Timing Role: Fault-tolerant flyback controller with latch-mode OTP triggered by NTC on CTRL pin. Use Value: Dual-threshold CTRL latch (0.5 V / 2.5 V) allows flexible thermal cutoff design; FOCP protects against rectifier short failures. | Use Scenario: 24 V/5 A industrial open-frame PSU with 150% peak load capability and EN61000-3-2 compliance. IC Role / Device Role / Timing Role: Core PWM engine with integrated slope compensation eliminating external compensation components. Use Value: Built-in 250 ns LEB and ±6% frequency dither meet Class B conducted EMI limits without added snubbers or shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3103AKTR-G1 | Pin-to-pin compatible; lacks VCC maintain mode and FOCP; 65 kHz only (no green-mode dither) | Lower-cost option where burst mode and secondary short protection are not required | Select when designing fixed-frequency flyback with minimal protection requirements and tighter BOM cost targets |
| ICE2QS03G | Fixed 65 kHz; includes quasi-resonant control; higher VCC UVLO (16.5 V); no CTRL latch configuration | Targets QR flyback topologies with zero-voltage switching for improved efficiency above 50% load | Choose for higher-efficiency mid-power designs where QR operation reduces MOSFET stress and EMI |
Compared with AP3103AKTR-G1 and ICE2QS03G, the AP3105NAKTR-G1 uniquely combines green-mode burst operation, VCC maintain functionality, and dual-threshold CTRL latch - enabling robust, low-noise, low-standby designs in space-constrained SOT-23-6 footprint.
Availability
AP3105NAKTR-G1 is available at Aetrix Electronics and suitable for AC-DC adapter/charger, ATX auxiliary power, and set-top box power supply designs requiring stable component supply, RoHS-compliant green packaging, and long-term lifecycle support.
Supply support for AP3105NAKTR-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The AP3105 product line delivers cost-effective, green-mode PWM controllers for universal-input offline flyback converters targeting consumer and computing power supplies with stringent standby and acoustic noise requirements.
FAQ
What is the purpose of the CTRL pin on AP3105NAKTR-G1?
The CTRL pin provides configurable latch protection: pulling it below 0.5 V or above 2.5 V disables the GATE output until AC power is cycled. It supports OTP via NTC thermistor to ground or OVP via voltage divider, and remains inactive if left open. This pin also detects CTRL short-to-ground faults to halt switching.
How does the VCC maintain mode operate during light-load conditions?
VCC maintain mode activates when VCC drops near the 10.2 V threshold during light load or step transients. The IC briefly resumes switching to recharge the VCC capacitor via the startup resistor, preventing UVLO-induced restart cycles. This ensures stable auxiliary rail operation without increasing standby loss.
Can AP3105NAKTR-G1 replace AP3103AKTR-G1 directly in existing designs?
Yes - AP3105NAKTR-G1 is pin-to-pin and functionally backward-compatible with AP3103AKTR-G1. All shared pins (GND, FB, CTRL, SENSE, VCC, GATE) retain identical electrical behavior. New features like VCC maintain and FOCP are inactive unless enabled, ensuring drop-in upgrade capability without layout changes.
What is the role of the 250 ns leading-edge blanking (LEB) on the SENSE pin?
The 250 ns LEB disables the current-sense comparator immediately after GATE turn-on to ignore parasitic voltage spikes caused by MOSFET switching transients. This prevents false OCP triggering and ensures accurate peak-current detection. An external RC filter on SENSE is still recommended to suppress undershoot below –0.3 V.
AP3105NAKTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
AP3105NAKTR-G1 FAQ
1.How can I place an order for AP3105NAKTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3105NAKTR-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 AP3105NAKTR-G1 reliable?
The price and inventory of AP3105NAKTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3105NAKTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3105NAKTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3105NAKTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3105NAKTR-G1?
AP3105NAKTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3105NAKTR-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 AP3105NAKTR-G1?
For technical support, including AP3105NAKTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3105NAKTR-G1 requirements.
6.How does Aetrix verify that AP3105NAKTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3105NAKTR-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 AP3105NAKTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3105NAKTR-G1?
All AP3105NAKTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3105NAKTR-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 AP3105NAKTR-G1 part is unused and in its original packaging.
Return procedure for AP3105NAKTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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