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Diodes Incorporated AP3105VKTR-G1
- Part No.:
- AP3105VKTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-6
- Datasheet:
-
AP3105VKTR-G1.pdf
- Description:
- IC OFFLINE SW FLYBACK SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
AP3105VKTR-G1 from Diodes Incorporated is a green-mode current-mode PWM controller in SOT-23-6 package, designed for off-line AC-DC power supplies. It delivers 65 kHz nominal switching frequency with ±6% dithering, burst-mode operation below 30 kHz to suppress audible noise, and cycle-by-cycle OCP with 0.85 V current-sense threshold. Used in notebook adapters and LCD monitor auxiliary supplies, it integrates leading-edge blanking (250 ns), internal slope compensation, and VCC maintain mode for stable light-load regulation.
For engineers reviewing the AP3105VKTR-G1 datasheet, AP3105VKTR-G1 pinout, AP3105VKTR-G1 application, or AP3105VKTR-G1 equivalent, this controller supports design of cost-sensitive, low-standby-loss SMPS with adjustable skip mode, latch-type OTP/OVP protection via CTRL pin, and secondary short-winding protection using FOCP at 1.8 V.
Technical Context
The AP3105VKTR-G1 implements fixed-frequency current-mode control with frequency foldback and burst-mode transition under light load, reducing average switching loss while maintaining output regulation. Its oscillator includes jitter modulation to improve EMI performance without external components.
Protection architecture combines auto-recoverable OLP and VOVP (28.5 V trigger) with latch-mode OTP and OVP triggered via CTRL pin thresholds (0.5 V low / 2.5 V high). The integrated 250 ns LEB, 0.85 V current-sense comparator, and 1.8 V FOCP comparator enable robust primary-side overcurrent response within 100 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 65 kHz typical; ±6% dithering reduces EMI peak emissions |
| Startup Current | 5 µA typical; enables high-value startup resistor to minimize standby loss |
| VCC UVLO Thresholds | Turn-on at 15.5 V, turn-off at 8.6 V; ensures reliable start-up and brown-out recovery |
| Current Sense Threshold | 0.85 V max; sets peak inductor current limit with cycle-by-cycle OCP |
| FOCP Threshold | 1.8 V; triggers fast overcurrent protection with ≤100 ns delay for secondary short detection |
| Burst Mode Frequency | 20–30 kHz; avoids audible noise while sustaining regulation during ultra-light load |
| CTRL Pin Latch Thresholds | 0.5 V (low) and 2.5 V (high); configurable latch protection for OTP/OVP events |
Pinout & Package
SOT-23-6 (K package), 2.82 mm × 2.95 mm × 1.45 mm body, thermal resistance θJA = 250 °C/W, rated for -40 °C to +150 °C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Signal ground reference | Return path for gate driver and internal bias circuits; must be low-impedance connection to power ground plane |
| 2 FB | Feedback input | Connects directly to opto-coupler cathode; voltage >4.2 V for 32 ms triggers hiccup-mode OLP protection |
| 3 CTRL | Latch control input | Configurable latch trigger: low-level (≤0.5 V) or high-level (≥2.5 V); open if unused |
| 4 SENSE | Current sense input | Monitors MOSFET source voltage via external shunt; built-in 250 ns LEB prevents false OCP triggering |
| 5 VCC | Supply voltage input | Power rail for internal circuitry; includes 28.5 V overvoltage clamp and 10.2 V VCC maintain mode activation |
| 6 GATE | Gate driver output | Push-pull CMOS output driving external MOSFET gate; 8 V high / 1 V low level at 20 mA load |
Key Features
| Feature | Design Value |
|---|---|
| Green-mode burst operation | Reduces switching loss at light load by lowering frequency to 20–30 kHz, eliminating audible coil whine |
| Adjustable skip mode | External resistor on SENSE pin sets burst entry point, enabling optimization of efficiency vs. output ripple trade-off |
| VCC maintain mode | Activates when VCC drops near 10.2 V to sustain gate drive and prevent unintended restart during step-load transients |
| Secondary short-winding protection (FOCP) | 1.8 V threshold with ≤100 ns response detects secondary rectifier shorts before catastrophic failure occurs |
| Integrated slope compensation | Eliminates need for external ramp generator in >50% duty-cycle applications, improving loop stability |
Applications
| Switching AC-DC Adapter/Charger | ATX/BTX Auxiliary Power |
|---|---|
|
Use Scenario: 19 V/3.42 A notebook adapter with universal AC input (90–265 VAC) and <300 mW standby consumption. IC Role / Device Role / Timing Role: Primary-side PWM controller regulating output via opto-coupler feedback; manages burst-mode transitions and VCC sustain during no-load. Use Value: Achieves DOE VI/CoC Tier 2 compliance with 65 kHz base frequency and dithering, reducing EMI filter cost by 25% versus fixed-frequency alternatives. |
Use Scenario: +5 VSB rail in ATX power supply delivering 2.5 A at 5 V with <0.5 W no-load consumption. IC Role / Device Role / Timing Role: Standby power controller managing auxiliary converter; uses CTRL pin for latch-mode OVP triggered by primary-side overvoltage. Use Value: Enables single-chip solution for auxiliary rail with integrated VCC maintain mode, eliminating need for auxiliary winding or linear regulator. |
| Set-top Box (STB) Power Supply | Open Frame Switching Power Supply |
|
Use Scenario: Dual-output (12 V/1 A, 3.3 V/2 A) STB supply operating in enclosed plastic housing with ambient up to 70 °C. IC Role / Device Role / Timing Role: Main PWM controller implementing thermal foldback via NTC-connected CTRL pin; monitors VCC for brown-out recovery. Use Value: Latch-mode OTP via CTRL pin prevents repeated cycling during overtemperature, improving system reliability in thermally constrained enclosures. |
Use Scenario: 24 V/5 A open-frame industrial supply with 100% load step response requirement and 1500 VAC isolation. IC Role / Device Role / Timing Role: Primary-side controller executing cycle-by-cycle OCP and FOCP; coordinates soft-start with 5 ms ramp time to limit inrush. Use Value: Built-in 250 ns LEB and 0.85 V current-sense threshold ensure clean MOSFET turn-on detection despite transformer leakage spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3125AVKTR-G1 | Higher VCC OVP (32 V), enhanced burst-mode resolution, 100 µA lower operating current | Supports wider input range (up to 305 VAC) and tighter standby regulation in high-line applications | Select for new designs requiring extended voltage margin and improved light-load efficiency |
| UC3842BD1R2G | Voltage-mode control, no burst mode, no integrated LEB or slope compensation, 16-pin SOIC package | Requires external compensation network and discrete OCP circuit; lacks green-mode features | Choose only for legacy redesign where footprint compatibility with UC3842 is mandatory |
Compared with AP3105VKTR-G1, AP3125AVKTR-G1 offers higher voltage tolerance and lower quiescent current for next-gen adapters, while UC3842BD1R2G provides basic voltage-mode control but demands additional components for protection and efficiency optimization.
Availability
AP3105VKTR-G1 is available at Aetrix Electronics and suitable for switching AC-DC adapters, ATX auxiliary power rails, and set-top box power supplies requiring stable component supply, RoHS/Green compliance, and long-term lifecycle support.
Supply support for AP3105VKTR-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 ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.
The AP3105 product line targets cost-sensitive, high-efficiency off-line SMPS designs-particularly AC-DC adapters and auxiliary supplies-where green-mode operation, integrated protection, and minimal external component count are critical.
FAQ
What is the function of the CTRL pin in AP3105VKTR-G1?
The CTRL pin provides configurable latch protection: it triggers shutdown when pulled below 0.5 V (low-threshold mode) or above 2.5 V (high-threshold mode). When used with an NTC thermistor to ground, it enables precise overtemperature protection. If unused, the pin must be left open-not tied to VCC or GND-to avoid false triggering.
How does the VCC maintain mode operate during light-load conditions?
VCC maintain mode activates when the VCC voltage drops to approximately 10.2 V. The IC briefly resumes switching to recharge the VCC capacitor via the startup resistor, preventing UVLO-induced restart cycles. This sustains regulation during no-load or micro-load conditions without requiring an auxiliary winding or linear regulator.
Can AP3105VKTR-G1 replace AP3103 in existing designs?
Yes-AP3105VKTR-G1 is pin-to-pin compatible with AP3103 and offers identical SOT-23-6 pinout and core functionality. However, it adds burst-mode operation, VCC maintain mode, and enhanced FOCP response. No layout changes are needed, but review timing parameters and protection thresholds to confirm system-level behavior matches requirements.
What is the purpose of the 250 ns leading-edge blanking (LEB) on the SENSE pin?
The 250 ns LEB disables the current-sense comparator immediately after MOSFET turn-on to ignore parasitic voltage spikes caused by transformer leakage inductance and PCB layout. This prevents false OCP triggering during normal switching transitions, ensuring reliable current limiting only during actual overcurrent events.
AP3105VKTR-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 Temperature, Over Voltage
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
- Mounting Type:
- Surface Mount
AP3105VKTR-G1 FAQ
1.How can I place an order for AP3105VKTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3105VKTR-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 AP3105VKTR-G1 reliable?
The price and inventory of AP3105VKTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3105VKTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3105VKTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3105VKTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3105VKTR-G1?
AP3105VKTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3105VKTR-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 AP3105VKTR-G1?
For technical support, including AP3105VKTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3105VKTR-G1 requirements.
6.How does Aetrix verify that AP3105VKTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3105VKTR-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 AP3105VKTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3105VKTR-G1?
All AP3105VKTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3105VKTR-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 AP3105VKTR-G1 part is unused and in its original packaging.
Return procedure for AP3105VKTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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