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Switching Controllers Fixed Freq (I) Mode For FlyBk Conv

Ovaga Certification

Brands: ON Semiconductor, LLC

Mfr.Part #: NCP1234AD65R2G

Datasheet: NCP1234AD65R2G Datasheet (PDF)

Package/Case: SOIC-7

Product Type: Power Management ICs

RoHS Status:

Stock Condition: 3947 pcs, New Original

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NCP1234AD65R2G General Description

The NCP1234 is a new fixed−frequency current−mode controller featuring Dynamic Self−Supply (DSS). This device is pin−to−pin compatible with the previous NCP12xx families.
The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients.



  • Fixed−Frequency Current−Mode Operation with Built−In Ramp Compensation
  • 65 kHz or 100 kHz Oscillator Frequency version
  • Frequency Foldback then Skip Mode for Maximized Performance in Light Load and Standby Conditions
  • Timer−Based Overload Protection with Latched (option A) or Auto−Recovery (option B) Operation
  • High−voltage Current Source with Dynamic Self−Supply, Simplifying the Design of the VCC Capacitor
  • Frequency Modulation for Softened EMI Signature, including during Frequency Foldback mode
  • Adjustable Overpower Compensation
  • Latch−off Input for Severe Fault Conditions, Allowing Direct Connection of an NTC for Overtemperature Protection (OTP)
  • VCC Operation up to 28 V, with Overvoltage Detection
  • 4.0 ms Soft−Start
  • Internal Thermal Shutdown
  • Pin−to−Pin Compatible with the Existing NCP12xx Series
  • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant




Parameter Value Parameter Value
Manufacturer: ON Semiconductor Product Category: Switching Controllers
RoHS: Y Switching Frequency: 65 kHz
Duty Cycle - Max: 85 % Output Current: 500 mA
Minimum Operating Temperature: - 40 C Maximum Operating Temperature: + 125 C
Mounting Style: SMD/SMT Package / Case: SOIC-7
Packaging: Reel Series: NCP1234
Type: Current Mode PWM Controllers Brand: ON Semiconductor
Fall Time: 70 ns Operating Supply Voltage: 28 V
Product Type: Switching Controllers Rise Time: 70 ns
Factory Pack Quantity: 2500 Subcategory: PMIC - Power Management ICs
Unit Weight: 0.008960 oz


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1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


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All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

  • ESD
  • ESD

Datasheet PDF

Preliminary Specification NCP1234AD65R2G PDF Download

Key points

  • The NCP1234AD65R2G chip is a high-performance offline PWM controller used in Power Factor Correction (PFC) applications. It incorporates a PFC controller and a high-voltage power MOSFET, providing advanced features like zero-voltage switching, low standby power consumption, and excellent line and load regulation. The chip is designed for AC/DC power supplies, LED drivers, and various other power management applications.
  • Features

    The NCP1234AD65R2G is an integrated circuit designed for offline flyback converters. It features overvoltage protection, overcurrent protection, auto-restart after a fault condition, and is capable of driving a power range of up to 60W. The IC also incorporates a frequency jitter feature to minimize EMI emissions.
  • Pinout

    The NCP1234AD65R2G is an integrated circuit with a 8-pin configuration. Its main function is a high-performance current-mode controller for Boost, Buck, and Buck-Boost power supplies.
  • Manufacturer

    The manufacturer of the NCP1234AD65R2G is ON Semiconductor. It is a semiconductor manufacturing company that specializes in power and energy efficient electronic components.
  • Application Field

    The NCP1234AD65R2G is a specific model of integrated circuit used in power management applications. It can be widely applied in various electronic devices like power adapters, chargers, and LCD TVs, where it provides control, regulation, and protection functions for efficient power delivery and reliable operation.
  • Package

    The NCP1234AD65R2G chip is available in a DPAK package type. It has a small form factor and measures approximately 6.5 mm x 9.15 mm in size.

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