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Diodes Incorporated AP3105NVKTR-G1
- Part No.:
- AP3105NVKTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-6
- Datasheet:
-
AP3105NVKTR-G1.pdf
- Description:
- IC OFFLINE SW FLYBACK SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,128
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Product details
Overview
AP3105NVKTR-G1 from Diodes Incorporated is a current-mode PWM controller IC for off-line AC-DC power supplies, featuring 65 kHz nominal switching frequency, burst-mode operation at ≤30 kHz under light load to suppress audible noise, and integrated cycle-by-cycle overcurrent protection (OCP) with 1.8 V FOCP threshold. It operates in SOT-23-6 package and is used in notebook adapters and LCD monitor auxiliary supplies.
For engineers reviewing the AP3105NVKTR-G1 datasheet, AP3105NVKTR-G1 pinout, AP3105NVKTR-G1 application, or AP3105NVKTR-G1 equivalent, key selection criteria include UVLO thresholds (15.5 V turn-on / 8.6 V turn-off), adjustable skip mode via external resistor, VCC maintain mode for stable light-load operation, and latch-type OVP/OTP protection behavior per AP3105NV version.
Technical Context
The AP3105NVKTR-G1 implements fixed-frequency current-mode control with ±6% frequency dithering to reduce EMI, internal slope compensation for >50% duty-cycle stability, and leading-edge blanking (250 ns) on the SENSE pin to reject MOSFET turn-on spikes. Its oscillator supports green-mode frequency foldback down to 20–30 kHz.
Protection architecture includes latch-mode VCC OVP (28.5 V trip), latch-mode OTP triggered via CTRL pin (0.5 V low-threshold / 2.5 V high-threshold), and hiccup-mode OLP with 64 ms delay. The VCC maintain comparator (10.2 V typical) sustains bias during light-load conditions without restarting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 65 kHz typical; dithered ±6% to reduce EMI peak energy |
| Startup Current | 5 µA typical; enables high-value startup resistors to minimize HV-side power loss |
| UVLO Thresholds | Turn-on at 15.5 V, turn-off at 8.6 V; ensures reliable start-up and hold-up during brownout |
| FOCP Threshold | 1.8 V at SENSE pin; provides fast 100 ns response for secondary short-circuit protection |
| VCC Maintain Voltage | 10.2 V typical; activates gate drive to recharge VCC capacitor during light-load standby |
| CTRL Latch Thresholds | 0.5 V (low) and 2.5 V (high); configurable thermal or overvoltage latch using NTC or voltage divider |
| Gate Drive Output | 8 V high / 1 V low @ 20 mA; sufficient to drive small-signal MOSFETs directly |
Pinout & Package
SOT-23-6 package (3.0 × 2.8 × 1.3 mm, 0.95 mm pitch), thermally enhanced with exposed pad not electrically connected.
| 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 | Connects to opto-coupler cathode; regulates output by terminating PWM when VFB ≥ 4.2 V (OLP) or ≤ 1.55 V (short-circuit shutdown) |
| 3 CTRL | Latch trigger input | Configurable OTP/OVP latch: pulled low (<0.5 V) or high (>2.5 V) to disable output until AC cycle reset |
| 4 SENSE | Current sense input | Monitors primary-side current via shunt resistor; includes 250 ns leading-edge blanking to ignore MOSFET turn-on spike |
| 5 VCC | Supply input | Bias supply (10–25 V operating range); includes 28.5 V latch OVP and 10.2 V maintain mode activation |
| 6 GATE | Gate driver output | PWM-controlled push-pull output driving external MOSFET gate; 350 mA sink/source capability |
Key Features
| Feature | Design Value |
|---|---|
| Non-audible green-mode control | Frequency foldback to 20–30 kHz under light load eliminates coil whine while maintaining <100 mW standby loss |
| Adjustable skip mode | External resistor on SENSE pin sets burst-mode entry point, enabling optimization for efficiency vs. output ripple trade-off |
| VCC maintain mode | Prevents unintended restart during step-load transients by actively recharging VCC capacitor below 10.2 V |
| Secondary short-winding protection | FOCP with 100 ns delay and 1.8 V threshold detects secondary rectifier shorts before catastrophic failure occurs |
| Comprehensive pin fault tolerance | Disables PWM if FB open/short, SENSE floating, or CTRL shorted to GND - prevents uncontrolled operation |
Applications
| AC-DC Notebook Adapter | ATX Auxiliary Power Supply |
|---|---|
|
Use Scenario: 19 V/3.42 A adapter for ultrabook with universal AC input (90–265 VAC). IC Role / Device Role / Timing Role: Primary-side PWM controller regulating flyback output via opto-coupler feedback loop; manages burst mode during USB-C sleep states. Use Value: 65 kHz base frequency + dithering meets CISPR-22 Class B conducted EMI limits; 5 µA startup current enables 2 MΩ startup resistor, cutting no-load dissipation by 40% vs. legacy controllers. |
Use Scenario: +5 VSB rail in ATX v2.4 PSUs powering motherboard standby logic and USB charging ports. IC Role / Device Role / Timing Role: Standby-mode flyback controller operating in burst mode at ~25 kHz; synchronized to main PFC stage enable signal. Use Value: VCC maintain mode sustains regulation during 100 ms load steps from 10 mA to 2 A without dropout; latch-mode OVP protects against transformer saturation faults. |
| Set-Top Box Power Supply | Open-Frame Industrial PSU |
|
Use Scenario: 12 V/1.5 A isolated supply for cable STB with zero-power IR wake-up requirement. IC Role / Device Role / Timing Role: Green-mode PWM controller entering deep burst mode (<25 kHz) during HDMI-CEC sleep; resumes full 65 kHz on IR signal detection. Use Value: Adjustable skip mode allows tuning burst threshold to match IR receiver quiescent current, achieving <75 mW no-load consumption per DOE Level VI. |
Use Scenario: 24 V/5 A open-frame PSU for industrial HMI panel with extended temperature (-40°C to +85°C) operation. IC Role / Device Role / Timing Role: Primary-side controller with NTC-connected CTRL pin providing latch-mode OTP; monitors heatsink temp via 10 kΩ thermistor. Use Value: Latch protection prevents thermal runaway during fan failure; 150°C max junction rating and 250°C/W θJA allow convection-cooled design without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3103KTR-G1 | Pin-to-pin compatible but lacks VCC maintain mode and CTRL latch; uses auto-recoverable OVP only | Suitable for cost-sensitive adapters where hiccup-mode restart is acceptable after overload | Select when system-level thermal management is handled externally and VCC hold-up time is >100 ms |
| ICE2QS03G | Higher integration (built-in HV starter), 65 kHz fixed frequency, no burst mode; requires external OCP | Used in compact wall-plug adapters with integrated HV startup; no light-load frequency modulation | Choose when eliminating startup resistor simplifies layout and audible noise is mitigated by mechanical damping |
Compared with AP3105NVKTR-G1, AP3103KTR-G1 offers lower BOM count but sacrifices latch safety for thermal events, while ICE2QS03G reduces external components at the cost of green-mode efficiency and programmable protection flexibility.
Availability
AP3105NVKTR-G1 is available at Aetrix Electronics and suitable for AC-DC notebook adapters, ATX auxiliary power supplies, and set-top box power supplies requiring stable component supply with RoHS-compliant green packaging.
Supply support for AP3105NVKTR-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 centers across Asia and manufacturing in China, Taiwan, and the US.
The AP3105 product line delivers cost-effective, green-mode PWM controllers optimized for universal-input offline flyback converters in consumer and computing power applications.
FAQ
What is the function of the CTRL pin in AP3105NVKTR-G1?
The CTRL pin provides dual-threshold latch protection: pulling it below 0.5 V or above 2.5 V disables the GATE output until AC power is cycled. When connected to an NTC thermistor to GND, it enables hardware-based OTP latching without software intervention - critical for fanless industrial designs.
How does the VCC maintain mode improve light-load performance?
VCC maintain mode activates when VCC drops to ~10.2 V, briefly enabling GATE pulses to recharge the VCC capacitor. This prevents the IC from falling into UVLO shutdown during standby, eliminating repeated cold starts and associated inrush stress on bulk capacitors and primary MOSFETs.
Can AP3105NVKTR-G1 replace AP3105NAKTR-G1 in existing designs?
Yes, with functional trade-offs: AP3105NVKTR-G1 uses latch-mode OVP and OLP instead of auto-recovery, so fault conditions require AC cycle reset. Layout and passive components remain identical, but system firmware must accommodate non-auto-recovering protection behavior.
What is the purpose of the 250 ns leading-edge blanking 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 drain-source capacitance discharge. This prevents false OCP triggering during normal switching, especially with high-dV/dt transformers or long PCB traces.
AP3105NVKTR-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
AP3105NVKTR-G1 FAQ
1.How can I place an order for AP3105NVKTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3105NVKTR-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 AP3105NVKTR-G1 reliable?
The price and inventory of AP3105NVKTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3105NVKTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3105NVKTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3105NVKTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3105NVKTR-G1?
AP3105NVKTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3105NVKTR-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 AP3105NVKTR-G1?
For technical support, including AP3105NVKTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3105NVKTR-G1 requirements.
6.How does Aetrix verify that AP3105NVKTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3105NVKTR-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 AP3105NVKTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3105NVKTR-G1?
All AP3105NVKTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3105NVKTR-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 AP3105NVKTR-G1 part is unused and in its original packaging.
Return procedure for AP3105NVKTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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