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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > PFC (Power Factor Correction)

Diodes Incorporated AP1661P-G1

Name: AP1661P-G1
Brand: Diodes Incorporated
SKU: AP1661P-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP1661P-G1

Manufacturer:: Diodes Incorporated

Category:: PFC (Power Factor Correction)

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: AP1661P-G1.pdf

Description:: IC PFC CTRLR BCM 8DIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,700

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Product details

Overview

AP1661P-G1 from BCD Semiconductor Manufacturing Limited is a DCM boundary-conduction-mode active power factor correction (PFC) controller IC designed for pre-converter stages in AC-DC adapters, off-line SMPS, and electronic ballasts. It integrates a one-quadrant multiplier, zero-current detector (ZCD), totem-pole gate driver (600mA source / 800mA sink), 2.5V ±1% internal reference, and under-voltage lockout with 2.5V hysteresis.

For engineers reviewing the AP1661P-G1 datasheet, AP1661P-G1 pinout, AP1661P-G1 application, or AP1661P-G1 equivalent, key selection criteria include DCM boundary-mode operation capability, precise OVP threshold (2.25V static), low start-up current (50μA typ), and compatibility with 8-pin DIP-8 packaging for through-hole high-reliability PFC designs.

Technical Context

The AP1661P-G1 implements a current-mode DCM PFC architecture where the ZCD input (Pin 5) triggers MOSFET turn-on at inductor current zero-crossing, and the multiplier output (Pin 4) sets cycle-by-cycle current limit based on error amplifier output (Pin 2) and rectified AC voltage (Pin 3). Its internal 2.5V reference feeds the error amplifier's non-inverting input for regulated DC bus voltage control.

Protection logic includes dynamic OVP detection via 40μA current sensing at COMP (Pin 2), static OVP clamping at 2.25V, UVLO with 12V turn-on/9.5V turn-off thresholds, and ZCD-based disable function activated below 150mV. The BiCMOS process enables 4mA typical operating supply current and 50μA start-up current.

Key Specifications

Parameter	Value and Actual Design Meaning
V_REF	2.5V ±1% - provides precision voltage regulation reference for error amplifier feedback loop
I_START-UP	50μA typical - enables reliable start-up from high-impedance VCC bias networks in offline applications
I_CC (operating)	4mA typical - minimizes auxiliary supply loading in high-efficiency PFC pre-regulators
UVLO Hysteresis	2.5V - prevents oscillation during brown-out conditions in universal-input AC-DC systems
OVP Threshold	2.25V static / 40μA dynamic - dual-stage overvoltage protection ensures fast shutdown and latch-off during output overvoltage events
ZCD Disable Threshold	150–250mV - allows hardware-level enable/disable control via external signal or ground tie
Driver Output	600mA source / 800mA sink - directly drives medium-power MOSFETs without external buffer stages

Pinout & Package

AP1661P-G1 is housed in an industry-standard 8-pin DIP package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with legacy PCB layouts and wave-soldering processes.

Pin/Terminal	Circuit Role	Design Meaning
1 (INV)	Inverting input of error amplifier	Connects to resistor divider from PFC output bus; sets regulated DC voltage level (e.g., 385V)
2 (COMP)	Error amplifier output	Drives multiplier input and senses OVP current; requires external compensation network to ground
3 (MULT)	Multiplier AC voltage input	Accepts scaled rectified line voltage (0–3.5V); shapes input current waveform to match voltage phase
4 (CS)	Current sense comparator input	Compares sensed MOSFET current against multiplier output; terminates conduction each cycle
5 (ZCD)	Zero-current detection input	Detects boost inductor demagnetization; triggers MOSFET turn-on at zero current crossing (DCM mode)
6 (GND)	Power and signal ground reference	Common return for gate driver, control circuits, and current sense path; must be low-impedance
7 (GD)	Totem-pole gate driver output	Directly drives N-channel MOSFET gate; supports fast rise/fall times (40–100ns) into 1nF load
8 (VCC)	Supply voltage input	Accepts 10.3–20V DC; includes UVLO and internal zener clamp (22V max) for robust biasing

Key Features

Feature	Design Value
DCM Boundary Conduction Control	Enables high-efficiency, low-EMI PFC operation without complex current reconstruction circuitry
Adjustable OVP with 1% Threshold Accuracy	Allows precise DC bus overvoltage cutoff (e.g., 400V ±2V) using external resistor divider on INV pin
Integrated Start-up Timer	Eliminates need for external RC timing components during initial VCC charge phase
Disable Function via ZCD Pin	Reduces quiescent current to 20–50μA when ZCD < 150mV, enabling standby-mode power savings
BiCMOS Process Implementation	Delivers low power dissipation (0.65W SOIC-8 / 1W DIP-8 @ 50°C ambient) and thermal stability

Applications

AC-DC Adapter

Off-line SMPS

Use Scenario: 85–265V AC input, 90W universal-input adapter with regulated 385V DC bus.

IC Role / Device Role / Timing Role: Primary-side PFC controller enforcing sinusoidal input current and unity power factor in DCM boundary mode.

Use Value: Meets IEC 61000-3-2 Class D harmonic limits while maintaining >92% system efficiency at full load.

Use Scenario: 300W industrial off-line SMPS with boost PFC front-end and LLC resonant secondary stage.

IC Role / Device Role / Timing Role: Pre-converter controller synchronizing MOSFET switching to zero-current crossings for minimal switching loss.

Use Value: Enables stable 380–400V DC bus across wide input range with THD < 5% at 100% load.

Electronic Ballast

LED Driver Power Supply

Use Scenario: Magnetic-core fluorescent lamp ballast with integrated PFC for 220V mains operation.

IC Role / Device Role / Timing Role: Regulates boost converter output to sustain lamp arc voltage while shaping input current waveform.

Use Value: Achieves PF > 0.98 and eliminates flicker by ensuring continuous conduction at lamp ignition phase.

Use Scenario: High-bay LED fixture with 200–400V DC output for constant-current LED strings.

IC Role / Device Role / Timing Role: Front-end PFC controller delivering stable high-voltage DC bus to downstream buck or flyback LED drivers.

Use Value: Supports dimmable operation with 10–100% load range while maintaining PF > 0.95 and OVP-safe bus voltage.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PFC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28019DR	Fixed-frequency CCM PFC controller; no ZCD input; requires external current sense transformer	Designed for higher-power (>250W), fixed-frequency continuous conduction mode systems	Select when CCM operation, tighter output voltage regulation, or higher power density is required
FAN7930C	DCM boundary-mode controller with integrated MOSFET driver; lower drive strength (500mA sink)	Optimized for cost-sensitive compact adapters; lacks adjustable OVP and ZCD disable function	Select for space-constrained consumer adapters where disable functionality is not needed

Compared with UCC28019DR and FAN7930C, AP1661P-G1 uniquely combines DCM boundary-mode operation, hardware disable via ZCD, and precise 2.25V static OVP-making it optimal for industrial-grade adapters requiring robust fault handling and flexible enable control.

Availability

AP1661P-G1 is available at Aetrix Electronics and suitable for AC-DC adapters, off-line SMPS, and electronic ballasts requiring stable component supply, RoHS-compliant green packaging, and long-term industrial lifecycle support.

Supply support for AP1661P-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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC design house specializing in high-performance, cost-effective power management solutions for industrial, consumer, and lighting applications.

The AP1661 belongs to BCD's Active PFC Controller product line, engineered specifically for DCM boundary-mode operation in universal-input AC-DC converters where high power factor, low THD, and robust protection are critical.

FAQ

What is the function of the ZCD pin on AP1661P-G1?

The ZCD (Pin 5) detects zero-current crossing of the boost inductor to trigger MOSFET turn-on in DCM boundary mode. When ZCD voltage falls below 1.6V (with 0.5V hysteresis), the gate driver activates. Pulling ZCD below 150mV disables the IC, reducing supply current to 20–50μA - a feature used for standby-mode control in energy-efficient designs.

How does the AP1661P-G1 implement overvoltage protection?

AP1661P-G1 uses dual-stage OVP: dynamic OVP triggers at 40μA current flow into COMP (Pin 2), causing immediate shutdown; static OVP activates if COMP voltage drops below 2.25V, latching off until the error amplifier recovers. This ensures both fast transient response and fail-safe bus voltage limiting in boost PFC topologies.

Can AP1661P-G1 operate without an external startup resistor?

No - AP1661P-G1 requires an external high-voltage startup resistor from rectified AC line to VCC (Pin 8) to charge the VCC capacitor before UVLO release. The internal start-up timer begins only after VCC reaches 12V; the 50μA start-up current specification assumes this external bias network is present and properly sized.

What is the maximum allowable VCC voltage for AP1661P-G1?

The absolute maximum VCC rating is 20V. Exceeding this risks permanent damage. The internal zener clamp activates at ~22V, but sustained operation above 20V violates Absolute Maximum Ratings. In practice, VCC should be regulated between 10.3V and 18V using a series regulator or resistive dropper with Zener clamp for reliability across temperature and line variations.

AP1661P-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Mode:: Boundary Conduction (BCM)

Frequency - Switching:: -

Current - Startup:: 50 µA

Voltage - Supply:: 14.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-PDIP

AP1661P-G1 FAQ

1.How can I place an order for AP1661P-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP1661P-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 AP1661P-G1 reliable?

The price and inventory of AP1661P-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1661P-G1 is usually 5 days.

3.What payment methods are accepted for AP1661P-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1661P-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP1661P-G1?

AP1661P-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP1661P-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 AP1661P-G1?

For technical support, including AP1661P-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1661P-G1 requirements.

6.How does Aetrix verify that AP1661P-G1 is sourced from the original manufacturer or authorized distributors?

All AP1661P-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 AP1661P-G1 meets industry standards.

7.What is the process for return or replacement of AP1661P-G1?

All AP1661P-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP1661P-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 AP1661P-G1 part is unused and in its original packaging.

Return procedure for AP1661P-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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