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Diodes Incorporated AP3776MTR-G1
- Part No.:
- AP3776MTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP3776MTR-G1.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,314
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Product details
Overview
AP3776MTR-G1 from Diodes Incorporated is a primary-side regulation (PSR) AC/DC controller IC for flyback converters in battery chargers and adapters. It delivers opto-coupler–free constant voltage (3.7 V feedback threshold) and constant current (450 mV current sense threshold) regulation, achieves ≤10 mW no-load input power, <1 s startup time, and operates in discontinuous conduction mode (DCM) with PFM control. It targets shaver, phone, and portable device chargers meeting "Super Star" standby criteria.
For engineers reviewing the AP3776MTR-G1 datasheet, AP3776MTR-G1 pinout, AP3776MTR-G1 application, or AP3776MTR-G1 equivalent, key selection considerations include its SO-8 package, 450 mV VCS threshold for CC accuracy, 3.7 V FB reference for CV stability, semi-valley turn-on for efficiency, and integrated cable compensation (7% typical) - all critical for low-noise, low-standby, single-stage charger designs.
Technical Context
The AP3776MTR-G1 implements primary-side regulation using auxiliary winding voltage sampling at the FB pin and primary current sensing at IS/VCS pins, eliminating secondary-side feedback components. Its PFM control dynamically adjusts switching frequency from ~5 kHz to 84 kHz across load conditions while maintaining DCM operation via peak current limiting and leading-edge blanking (500 ns).
It integrates three-segment current sensing thresholds (VCS_H/VCS_M/VCS_L) to sustain >24 kHz minimum switching frequency under light loads, preventing audible noise. Line compensation (0.7 µS transconductance) corrects CC deviation across input voltage ranges, and internal cable compensation (7% ΔVFB/VFB) offsets output cable voltage drop without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Method | Pulse Frequency Modulation (PFM) for DCM flyback operation - enables ultra-low standby power and variable-frequency efficiency optimization. |
| No-load Input Power | ≤10 mW - meets "Super Star" energy efficiency requirements for battery chargers without auxiliary bias winding. |
| Feedback Threshold (FB) | 3.70 V (typ) - sets precise constant output voltage via auxiliary winding sensing, eliminating opto-coupler and TL431. |
| Current Sense Threshold (VCS) | 450 mV (typ) - defines accurate constant current limit by sensing primary-side resistor voltage, enabling tight CC regulation. |
| Startup Threshold (VTH(ST)) | 13 V (typ) - ensures reliable IC activation from bulk rectified AC input; minimal operating voltage is 6.1 V after startup. |
| Cable Compensation | 7% (typ) ΔVFB/VFB - internally adjusts FB reference to offset fixed voltage drop across USB/cable wiring, improving load regulation. |
| Switching Frequency Range | 5 kHz to 84 kHz - dynamically scaled by load; multi-segment VCS prevents audio-band operation (<20 kHz) across full load range. |
Pinout & Package
AP3776MTR-G1 is housed in an SO-8 surface-mount package with standard 1.27 mm pitch, RoHS-compliant, lead-free, and halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IS | Primary current sense input | Connects to current-sense resistor (RCS); triggers MOSFET turn-off when sensed voltage reaches 450 mV threshold. |
| 2 EM | External MOSFET source connection | Directly ties to source of external power MOSFET; enables accurate high-side current sensing and semi-valley detection. |
| 3 VCC | IC power supply | Supplied by auxiliary winding; starts up at 13 V, sustains operation down to 6.1 V; internal UVLO ensures safe restart. |
| 4 OUT | MOSFET gate driver output | Drives external N-channel MOSFET gate with 500 mA sink / 67 mA source capability; includes 15 V clamp for robustness. |
| 5 GND | Analog/digital ground reference | Common return for all internal circuits; must be low-impedance and separated from power ground in layout. |
| 6 VCS | Current sense voltage input | Monitors voltage across RCS; used for peak current control, OCP, and line compensation current injection. |
| 7 CPC | Cable compensation capacitor terminal | Connects external capacitor to set cable compensation slope; enables 7% output voltage boost under load to counteract cable loss. |
| 8 FB | Voltage feedback input | Samples auxiliary winding voltage during secondary diode conduction; regulates output voltage to 3.7 V reference. |
Key Features
| Feature | Design Value |
|---|---|
| Opto-coupler–free PSR | Eliminates isolation barrier components (opto + TL431), reducing BOM cost, PCB area, and reliability risk in charger designs. |
| Semi-valley turn-on | Reduces switching loss and EMI by triggering MOSFET at valley of drain voltage waveform, improving efficiency above 75% load. |
| Random frequency adjustment | Spreads switching spectrum to lower peak EMI emissions, easing compliance with CISPR 22/32 Class B conducted and radiated limits. |
| Integrated protection suite | Includes FB overvoltage (7.5 V), short-circuit (2.5 V), overtemperature (130 °C), and RCS short detection - enables fully self-protected SMPS. |
| Audio noise suppression | Three-segment VCS thresholding maintains >24 kHz minimum switching frequency across 0–100% load, preventing audible transformer whine. |
Applications
| USB Wall Charger | Shaver Power Adapter |
|---|---|
|
Use Scenario: 5 V / 2 A USB charging adapter for smartphones and tablets with strict EU CoC Tier 2 and DOE Level VI standby requirements. IC Role / Device Role / Timing Role: Primary-side regulation controller managing PFM-based DCM flyback operation, real-time CV/CC loop control, and cable compensation without opto-coupler. Use Value: Achieves ≤10 mW no-load power and <1 s startup while maintaining ±5% output regulation across 0–2 A load and 90–264 VAC input. |
Use Scenario: Compact 5 V / 1 A AC-powered electric shaver adapter requiring silent operation and high reliability in humid environments. IC Role / Device Role / Timing Role: PSR controller implementing semi-valley switching and multi-segment current sensing to suppress audible noise below 20 kHz. Use Value: Enables fanless, whisper-quiet operation with <20 dB(A) acoustic noise and full protection against overvoltage, short circuit, and thermal runaway. |
| Portable Speaker PSU | Bluetooth Headset Charging Dock |
|
Use Scenario: 5 V / 1.5 A isolated power supply for rechargeable Bluetooth speakers with integrated Li-ion battery management. IC Role / Device Role / Timing Role: Constant-current regulator setting charge current via primary-side sensing; supports APR343/AP4341 wake-up signaling for dynamic load response. Use Value: Delivers ±3% CC accuracy across line/load/temperature and enables <50 mV output undershoot during load transients when paired with APR343. |
Use Scenario: Dual-port 5 V / 0.5 A charging dock for wireless earbuds with space-constrained PCB and zero-audible-noise requirement. IC Role / Device Role / Timing Role: Low-quiescent-current PSR controller (100 µA in LL mode) enabling <15 mW standby power and rapid wake-up from ultra-light load. Use Value: Reduces total system standby consumption to <20 mW while maintaining fast transient recovery (<500 µs) and stable 5 V output under pulsed charging loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side regulation controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3773MTR-G1 | Lacks integrated cable compensation and line compensation; uses fixed 400 mV VCS threshold; no LL mode. | Targeted at cost-sensitive, non-USB-C chargers where cable drop is negligible and line regulation <±5% is acceptable. | Select when BOM cost reduction outweighs need for tight load regulation and universal input line compensation. |
| PN8305H | Higher VCS threshold (500 mV); no semi-valley turn-on; requires external loop compensation; 15 mW typical no-load power. | Suitable for basic 5 V / 1 A adapters where EMI filtering budget allows higher peak emissions and audio noise is not critical. | Choose only if legacy design reuse is required and 10 mW standby compliance is not mandated. |
Compared with AP3773MTR-G1 and PN8305H, the AP3776MTR-G1 uniquely combines 7% cable compensation, adjustable line compensation, semi-valley switching, and LL-mode quiescent current (100 µA) - making it the only option among the three capable of achieving <10 mW standby while maintaining ±3% CV/CC accuracy across global AC inputs and long USB cables.
Availability
AP3776MTR-G1 is available at Aetrix Electronics and suitable for USB wall chargers, shaver adapters, portable speaker power supplies, and Bluetooth headset docks requiring stable component supply, full RoHS/Green compliance, and production-ready PSR controller qualification.
Supply support for AP3776MTR-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, specializing in power management, signal integrity, and connectivity solutions for consumer, industrial, and computing markets.
The AP3776 belongs to Diodes' AC/DC PSR controller product line, engineered specifically for ultra-low-standby, opto-coupler–free flyback chargers targeting international energy efficiency standards including "Super Star", DoE Level VI, and EU CoC Tier 2.
FAQ
What is the purpose of the CPC pin on the AP3776MTR-G1?
The CPC (Cable Compensation) pin connects to an external capacitor that sets the slope of internal cable compensation voltage. This feature injects a proportional boost into the FB reference to offset voltage drop across USB or DC cables, delivering 7% typical ΔVFB/VFB correction - ensuring stable 5 V output at the device port even with 0.5 Ω cable resistance.
How does the AP3776MTR-G1 achieve <10 mW no-load power?
The AP3776MTR-G1 achieves ≤10 mW no-load input power through multiple techniques: ultra-low standby quiescent current (100 µA in LL mode), automatic transition to low-frequency burst mode at light loads, elimination of opto-coupler and TL431 bias currents, and internal power gating of non-essential blocks during no-load operation - all verified per IEC 62301 Ed. 2 test conditions.
Can the AP3776MTR-G1 operate without an auxiliary winding?
No. The AP3776MTR-G1 requires an auxiliary winding on the flyback transformer to provide VCC supply and sample output voltage via the FB pin. The auxiliary winding voltage is magnetically coupled to the secondary, enabling primary-side regulation. Without it, the IC cannot start up or regulate output voltage - no bootstrap or capacitive VCC alternatives are supported.
What protection features are integrated into the AP3776MTR-G1?
The AP3776MTR-G1 integrates six hardware protections: FB overvoltage (7.5 V trip), short-circuit (2.5 V FB threshold), overtemperature (130 °C junction), RCS short detection, open-circuit feedback (OCKP), and maximum on-time limiting (40 µs). All trigger hiccup or shutdown modes with auto-restart, and no external components are needed to enable full-system fault coverage.
AP3776MTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Isolation:
- Isolated
- Internal Switch(s):
- No
- Voltage - Breakdown:
- -
- Topology:
- Flyback
- Voltage - Start Up:
- 13 V
- Voltage - Supply (Vcc/Vdd):
- 6.1V ~ 28V
- Duty Cycle:
- -
- Frequency - Switching:
- -
- Power (Watts):
- -
- Fault Protection:
- Over Temperature, Over Voltage, Short Circuit
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
AP3776MTR-G1 FAQ
1.How can I place an order for AP3776MTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3776MTR-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 AP3776MTR-G1 reliable?
The price and inventory of AP3776MTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3776MTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3776MTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3776MTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3776MTR-G1?
AP3776MTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3776MTR-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 AP3776MTR-G1?
For technical support, including AP3776MTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3776MTR-G1 requirements.
6.How does Aetrix verify that AP3776MTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3776MTR-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 AP3776MTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3776MTR-G1?
All AP3776MTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3776MTR-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 AP3776MTR-G1 part is unused and in its original packaging.
Return procedure for AP3776MTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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