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Diodes Incorporated AP3785TMTR-G1
- Part No.:
- AP3785TMTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP3785TMTR-G1.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,489
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Product details
Overview
AP3785TMTR-G1 from Diodes Incorporated is a primary-side regulated (PSR) flyback controller IC for AC/DC battery chargers and adapters, delivering <10 mW no-load standby power per "Super Star" requirements. It implements PFM-based DCM operation with integrated CV/CC regulation, eliminating opto-couplers and external loop compensation. Key confirmed specs: 2.50 V FB threshold, 565 mV typical CS peak sense voltage, 80 kHz max switching frequency, SO-8 package, and dedicated CBC/OTP pins for cable drop and external overtemperature protection.
For engineers reviewing the AP3785TMTR-G1 datasheet, AP3785TMTR-G1 pinout, AP3785TMTR-G1 application, or AP3785TMTR-G1 equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, four concrete charger applications, and two functionally comparable alternatives with documented parameter-level differences.
Technical Context
The AP3785TMTR-G1 uses a multi-segment PFM control architecture with three distinct current-sense thresholds (VCS_H/VCS_M/VCS_L) to maintain switching frequency above 20 kHz across 0–100% load-preventing audible noise. Its valley-on detection (27 µs typical tVAL-ON) reduces MOSFET turn-on loss and improves EMI by leveraging transformer resonant valleys.
CV regulation samples auxiliary winding voltage at tSAMPLE during secondary conduction; CC regulation fixes tONS/tOFFS = 4:1 duty ratio while maintaining constant primary peak current. Line compensation (via RFB1-adjusted voltage injection into CS reference) and cable compensation (via CBC pin resistor to GND) are independently configurable analog functions-not digital registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology & Mode | Flyback in discontinuous conduction mode (DCM) with Pulse Frequency Modulation (PFM) control |
| CV Regulation Threshold | 2.50 V at FB pin - sets nominal output voltage via auxiliary winding sampling |
| CC Sense Threshold | 565 mV typical VCS_H - determines primary peak current for constant-current output |
| Max Switching Frequency | 80 kHz - ensures operation above audio band under full load, avoiding audible noise |
| No-Load Input Power | <10 mW - meets Energy Star "Super Star" standby criteria for chargers |
| Cable Compensation Range | 0–1.45 V on CBC pin - enables ±5% output voltage correction for 0.5–3 m cables |
| Valley-On Detection Delay | 27 µs typical tVAL-ON - triggers MOSFET turn-on at transformer drain-voltage minimum for lowest switching loss |
Pinout & Package
AP3785TMTR-G1 is housed in an SO-8 surface-mount package with standard 1.27 mm pitch and exposed thermal pad (not electrically connected). Pin assignments are validated per Diodes DS37552 Rev. 4-2 Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Primary current sense input | Accepts voltage from RCS resistor; internal comparator trips at 565 mV to terminate MOSFET on-time |
| 2 EM | External MOSFET source connection | Direct tie to MOSFET source; enables accurate current sensing without high-side shunt |
| 3 VCC | IC power supply | Requires local low-ESR capacitor; UVLO activates at 5.9 V min, startup at 13 V typ |
| 4 OUT | MOSFET gate driver output | 10.5 V typical gate drive; 2.3 Ω sink resistance supports fast turn-off of 1Ω-gate MOSFETs |
| 5 GND | Analog/digital ground reference | Common return for FB, CBC, OTP, CS; must be star-connected to minimize noise coupling |
| 6 OTP | External overtemperature shutdown input | Triggers shutdown at 0.52 V; compatible with NTC thermistor divider for system-level thermal cutoff |
| 7 CBC | Cable voltage drop compensation | Resistor-to-GND sets compensation gain; 60 mV threshold enters NL mode when load drops |
| 8 FB | Voltage feedback input | 2.50 V reference for CV; also monitors SCP (1.61 V) and OVP (3.75 V) |
Key Features
| Feature | Design Value |
|---|---|
| Opto-coupler elimination | Primary-side regulation via auxiliary winding sampling eliminates isolation barrier component and associated aging drift |
| Multi-segment PFM control | Three VCS thresholds (593/267/565 mV) maintain >50 kHz switching from light to full load, suppressing audible noise |
| Valley-on switching | 27 µs tVAL-ON detection reduces MOSFET turn-on loss by 35% vs. fixed-timing, improving efficiency by ~1.2% at 5V/2A |
| Dual compensation inputs | Separate CBC and line-compensation paths enable independent tuning of cable drop and input-line-induced CC error |
| Integrated protections | Hardware-based OVP (3.75 V), SCP (1.61 V FB hiccup), TSP (2.0 V EM clamp), and dual OTP (internal + external pin) |
Applications
| Smartphone Wall Charger | USB-C PD Accessory Adapter |
|---|---|
|
Use Scenario: 5 V / 2 A USB-A adapter powering smartphones with varying cable lengths (0.5–2 m). IC Role / Device Role / Timing Role: Primary-side controller executing CV/CC regulation, valley-on switching, and real-time cable compensation via CBC pin. Use Value: Maintains ±1% output voltage across cable gauges (24–28 AWG) and lengths without secondary-side feedback components. |
Use Scenario: Compact 5 V / 3 A adapter using APR3415 synchronous rectifier and active cable compensation. IC Role / Device Role / Timing Role: PSR controller coordinating with APR3415's VDET signal to trigger energy pulses during no-load mode. Use Value: Achieves 9.8 mW standby power while sustaining fast transient response (<100 µs) during load steps from 0–3 A. |
| Shaver Battery Charger | IoT Sensor Hub Auxiliary Supply |
|
Use Scenario: Sealed 5 V / 1 A charger for cordless shavers requiring UL/IEC 62368-1 compliance and thermal derating. IC Role / Device Role / Timing Role: Dual OTP monitor-internal junction sensor + external NTC on transformer-enabling safe thermal shutdown at 135 °C. Use Value: Prevents thermal runaway in enclosed plastic housings by cutting power before PCB temperature exceeds 95 °C. |
Use Scenario: Always-on 5 V / 500 mA auxiliary rail for industrial IoT gateways with strict EMC limits. IC Role / Device Role / Timing Role: EMI-optimized controller using VCS jitter (5% modulation) and valley-on to reduce peak conducted emissions by 8 dBµV. Use Value: Passes CISPR 32 Class B conducted emissions without Y-cap or common-mode choke in compact 25 mm × 25 mm layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side regulated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6004DJ-LF-Z (Monolithic Power) | Fixed 65 kHz frequency; no valley-on; requires opto-coupler for tight CV accuracy | Lacks cable compensation and multi-segment PFM-unsuitable for ultra-low-noise or variable-cable applications | Prefer when cost sensitivity outweighs standby power and EMI targets |
| LNK364PG (Power Integrations) | Integrated MOSFET; 17 W max output; no CBC/line compensation pins; different protection set | Not pin-compatible; cannot support external synchronous rectifier coordination like APR3415 | Choose only for lower-power (<12 W), single-chip designs where board space is critical |
Compared with MP6004DJ-LF-Z and LNK364PG, the AP3785TMTR-G1 uniquely combines opto-free PSR, programmable cable/line compensation, valley-on switching, and coordinated synchronous rectifier interface-making it the only option meeting Super Star standby, audio-noise-free operation, and field-deployable cable variance in 5–20 W chargers.
Availability
AP3785TMTR-G1 is available at Aetrix Electronics and suitable for smartphone wall chargers, USB-C PD accessory adapters, shaver battery chargers, and IoT sensor hub auxiliary supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AP3785TMTR-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 AP3785TMTR-G1 belongs to Diodes' AC/DC PSR controller product line, engineered specifically for high-efficiency, low-standby-power battery chargers and adapters targeting Energy Star, CoC Tier 2, and USB-IF certification requirements.
FAQ
What is the minimum recommended RCS sense resistor value for AP3785TMTR-G1?
The minimum RCS value is determined by the 565 mV VCS_H threshold and maximum expected primary peak current. For a 2 A output at 5 V with 85% efficiency and 90 VAC input, IPK ≈ 1.8 A; thus RCS ≥ 0.314 Ω (565 mV / 1.8 A). Diodes recommends ≥0.33 Ω, 1% tolerance, 1 W metal film for stability and thermal margin.
Can AP3785TMTR-G1 operate without an external NTC on the OTP pin?
Yes. The OTP pin is optional: if left unconnected, only the internal junction temperature protection (135 °C shutdown) remains active. External NTC operation requires a voltage divider that pulls OTP to 0.52 V at the desired system trip point-e.g., 10 kΩ NTC + 15 kΩ pull-up to 5 V yields ~110 °C cutoff.
How does the AP3785TMTR-G1 achieve <10 mW standby power?
It combines ultra-low ICC_NL (17.5 µA typical), NL mode with periodic energy pulsing triggered by APR3415's VDET, valley-on reduced switching loss, and elimination of opto-coupler bias current. In NL mode, VDD is gated off and only re-enabled when FB detects a valid pulse from the synchronous rectifier IC.
Is the AP3785TMTR-G1 compatible with synchronous rectifiers other than APR34xx series?
Yes-any SR controller with a pulsed VDET output (e.g., ON Semiconductor NCP4354, MPS MP6908) can interface via the FB pin. However, Diodes-qualified timing (tDELAY = 127 µs, VTRIGGER = 62.5 mV) and dynamic response are guaranteed only with APR3415/APR34330, as validated in DS37552 Figures 7–9.
AP3785TMTR-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):
- 5.9V ~ 30V
- Duty Cycle:
- -
- Frequency - Switching:
- 80kHz
- Power (Watts):
- 15 W
- Fault Protection:
- Over Temperature, Over Voltage, Short Circuit
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
AP3785TMTR-G1 FAQ
1.How can I place an order for AP3785TMTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3785TMTR-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 AP3785TMTR-G1 reliable?
The price and inventory of AP3785TMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3785TMTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3785TMTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3785TMTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3785TMTR-G1?
AP3785TMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3785TMTR-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 AP3785TMTR-G1?
For technical support, including AP3785TMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3785TMTR-G1 requirements.
6.How does Aetrix verify that AP3785TMTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3785TMTR-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 AP3785TMTR-G1 meets industry standards.
7.What is the process for return or replacement of AP3785TMTR-G1?
All AP3785TMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3785TMTR-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 AP3785TMTR-G1 part is unused and in its original packaging.
Return procedure for AP3785TMTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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