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Diodes Incorporated AP3105DKTR-G1
- Part No.:
- AP3105DKTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-6
- Datasheet:
-
AP3105DKTR-G1.pdf
- Description:
- IC OFFLINE SW FLYBACK SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,723
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Product details
Overview
AP3105DKTR-G1 from Diodes Incorporated is a current-mode PWM controller IC for off-line AC/DC power supplies, featuring 65 kHz nominal switching frequency, green-mode burst operation down to 20 kHz, and cycle-by-cycle overcurrent protection (OCP) with 1.8 V FOCP threshold. It integrates leading-edge blanking (250 ns), internal slope compensation, soft-start (5 ms typ), and VCC maintain mode for stable light-load operation in audio power supplies.
For engineers reviewing the AP3105DKTR-G1 datasheet, AP3105DKTR-G1 pinout, AP3105DKTR-G1 application, or AP3105DKTR-G1 equivalent, key selection criteria include startup current (5 µA typ), UVLO thresholds (15.5 V on / 8.6 V off), adjustable skip mode via external resistor, latch-type OTP via CTRL pin, and SOT-23-6 package compatibility with AP3103.
Technical Context
The AP3105DKTR-G1 implements fixed-frequency current-mode control with frequency foldback and burst-mode transition below ~20% load to suppress audible noise and minimize standby loss. Its oscillator includes temperature- and voltage-stable frequency regulation (±5% over -20°C to 125°C, ±3% across VCC = 12–30 V).
Protection architecture combines auto-recoverable OLP (32 ms delay), latch-mode OTP triggered by CTRL pin (0.5 V low-threshold or 2.5 V high-threshold), VCC OVP (28.5 V), and pin-fault detection for floating SENSE/FB or shorted CTRL. FOCP responds within 100 ns at 1.8 V to prevent secondary winding short damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 65 kHz nominal; reduces to 20–30 kHz in green mode to avoid audible noise and cut standby loss |
| Startup Current | 5 µA typical - enables use of high-value startup resistors to minimize power loss on 265 VAC input |
| UVLO Thresholds | Turn-on at 15.5 V, turn-off at 8.6 V - ensures reliable start-up from hold-up capacitor and prevents brownout oscillation |
| Current Sense Threshold | 0.9 V max at SENSE pin - sets peak inductor current limit; FOCP triggers at 1.8 V with 100 ns response |
| Soft-Start Time | 5 ms typical - controls inrush current during power-up and prevents transformer saturation |
| VCC Maintain Voltage | 10.2 V typical - activates auxiliary switching to sustain VCC during light/step loads, avoiding unintended restarts |
| GATE Drive Capability | 350 mA sink/source - directly drives MOSFET gates without external buffer in ≤30 W designs |
Pinout & Package
SOT-23-6 (K package), 2.82 mm × 2.95 mm footprint, 1.45 mm max height, thermal resistance θJA = 250 °C/W. RoHS-compliant, green (Pb-free) construction with G1 suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Signal ground reference | Return path for control logic and gate driver; must be low-impedance connection to power ground plane |
| 2 FB | Feedback input | Connects to opto-coupler cathode; regulates output voltage via 1.55 V shutdown and 4.2 V OLP thresholds |
| 3 CTRL | Latch trigger input | Configurable OTP: pull below 0.5 V or above 2.5 V to enter non-auto-recoverable shutdown until AC cycle reset |
| 4 SENSE | Current sense input | Monitors MOSFET source voltage via shunt resistor; built-in 250 ns LEB avoids false OCP at switch turn-on |
| 5 VCC | Supply input | Power rail for internal bias and gate driver; includes UVLO, OVP (30 V clamp), and VCC maintain circuitry |
| 6 GATE | Gate driver output | PWM-controlled push-pull output driving external MOSFET gate; 8 V high / 1 V low level at 20 mA load |
Key Features
| Feature | Design Value |
|---|---|
| Green-mode burst control | Reduces switching frequency to 20–30 kHz under light load, eliminating audible coil whine while cutting standby power |
| Adjustable skip mode | External resistor on SENSE pin sets transition point between continuous and burst modes for optimized efficiency across load range |
| Integrated FOCP protection | 1.8 V fast overcurrent threshold with ≤100 ns delay prevents catastrophic failure during secondary rectifier short events |
| VCC maintain function | Activates auxiliary switching when VCC drops near 10.2 V, sustaining supply during step loads without requiring oversized VCC capacitor |
| Comprehensive pin fault immunity | Detects and disables PWM on SENSE/FB float or CTRL short-to-ground - eliminates need for external fault monitoring circuitry |
Applications
| Audio Power Supply | Compact AC/DC Adapter |
|---|---|
|
Use Scenario: 12–24 V DC output for Class D audio amplifiers with <500 mW standby requirement. IC Role / Device Role / Timing Role: Primary-side PWM controller regulating flyback converter; manages burst-mode timing and VCC sustain during mute/sleep states. Use Value: 20 kHz minimum switching frequency avoids audible noise in speaker enclosures; 5 µA startup current enables >1 MΩ startup resistor for <30 mW no-load loss. |
Use Scenario: Universal-input (90–265 VAC), 5–12 V/1–3 A wall adapter for IoT sensors and USB-C accessories. IC Role / Device Role / Timing Role: Current-mode flyback controller with integrated OCP, OLP, and VCC OVP; coordinates burst-mode entry/exit timing based on FB voltage decay rate. Use Value: Pin-fault protection eliminates need for external SENSE/FB pull-ups; VCC maintain mode sustains regulation during 100 ms load transients without output droop. |
| LED Driver Power Stage | Industrial Control PSU |
|
Use Scenario: Constant-voltage LED driver powering 12 V addressable RGB strips in smart lighting systems. IC Role / Device Role / Timing Role: Primary-side regulator with opto-coupled feedback loop; uses CTRL pin for thermal foldback via NTC to limit LED junction temperature. Use Value: Adjustable skip mode extends efficiency plateau to <10% load; soft-start prevents inrush-induced LED flash during cold start. |
Use Scenario: 24 V/0.5 A auxiliary supply for PLC I/O modules operating in 0–70 °C ambient with EMI-sensitive analog inputs. IC Role / Device Role / Timing Role: Isolated flyback controller implementing soft-switching and slope compensation to meet CISPR-22 Class B conducted emissions limits. Use Value: Built-in slope compensation stabilizes >50% duty cycles without external components; 150 ns gate rise/fall times reduce EMI generation at fundamental frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3103DKTR-G1 | Pin-to-pin compatible; lacks VCC maintain mode and CTRL latch configuration flexibility - only supports low-threshold OTP | Lower-cost option where VCC sustain during step loads is not required and thermal protection is implemented externally | Select when system design uses large VCC capacitor and does not require precise OTP de-latch timing control |
| OB2262MP | Higher startup current (25 µA), no built-in slope compensation, fixed 65 kHz only - requires external RC for frequency foldback | Better suited for cost-sensitive consumer adapters where full green-mode optimization is secondary to BOM count reduction | Choose when design prioritizes minimal external components over ultra-low standby power and robust light-load regulation |
Compared with AP3105DKTR-G1, AP3103DKTR-G1 omits VCC maintain and dual-threshold CTRL latching, simplifying design but limiting step-load resilience; OB2262MP trades green-mode sophistication for lower gate count and wider VCC operating range (8–36 V), making it more tolerant of unregulated bus variations.
Availability
AP3105DKTR-G1 is available at Aetrix Electronics and suitable for audio power supplies, compact AC/DC adapters, and industrial control PSUs requiring stable component supply, RoHS compliance, and green-mode efficiency certification.
Supply support for AP3105DKTR-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP3105D belongs to Diodes' Green-Mode PWM Controller product line, engineered specifically for cost-sensitive, low-noise, high-efficiency off-line flyback converters in audio and consumer power applications.
FAQ
What is the purpose of the CTRL pin on AP3105DKTR-G1?
The CTRL pin provides configurable latch-type overtemperature protection (OTP). It can be triggered by pulling below 0.5 V (low-threshold mode) or above 2.5 V (high-threshold mode), causing non-auto-recoverable shutdown until AC input is cycled. Connecting an NTC thermistor between CTRL and GND enables thermal foldback without external comparators.
How does the VCC maintain mode operate during light-load conditions?
VCC maintain mode activates when VCC drops to ~10.2 V, forcing brief PWM pulses to recharge the VCC capacitor via the startup resistor. This prevents VCC from falling to the 8.6 V UVLO shutdown threshold during extended no-load or light-load periods, eliminating unwanted restart cycles and maintaining regulation stability.
Can AP3105DKTR-G1 replace AP3103DKTR-G1 without circuit changes?
Yes - AP3105DKTR-G1 is pin-to-pin compatible with AP3103DKTR-G1 and shares identical SOT-23-6 pinout and basic functionality. However, AP3105DKTR-G1 adds VCC maintain mode and dual-threshold CTRL latching, which remain inactive unless explicitly enabled via external components.
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 drain-source capacitance and transformer leakage inductance. This prevents false OCP triggering and ensures accurate peak-current sensing during steady-state conduction.
AP3105DKTR-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 Temperature, Over Voltage
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
AP3105DKTR-G1 FAQ
1.How can I place an order for AP3105DKTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3105DKTR-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 AP3105DKTR-G1 reliable?
The price and inventory of AP3105DKTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3105DKTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3105DKTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3105DKTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3105DKTR-G1?
AP3105DKTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3105DKTR-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 AP3105DKTR-G1?
For technical support, including AP3105DKTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3105DKTR-G1 requirements.
6.How does Aetrix verify that AP3105DKTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3105DKTR-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 AP3105DKTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3105DKTR-G1?
All AP3105DKTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3105DKTR-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 AP3105DKTR-G1 part is unused and in its original packaging.
Return procedure for AP3105DKTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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