Offline Controllers | NCP1234

Controller, Fixed Frequency, Current Mode, for Flyback Converters

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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.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where component cost is the key constraint.
It features a timer-based fault detection that ensures the detection of overload independently of an auxiliary winding, and an adjustable compensation to help keep the maximum power independent of the input voltage.

  • Consumer Electronics Power Supplies
  • Auxiliary/Housekeeping power supplies

  • Notebooks

  • Frequency Foldback then Skip Mode in light load and standby conditions
  • High voltage current source with brown-out detection and dynamic self-supply
  • Frequency Jittering
  • 4.0 ms Soft-Start
  • Adjustable Overpower Compensation
  • Latched / Autorecovery Timer-Based Overload Protection

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Reference Price

NCP1234AD100R2G

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CAD Model

Pb

A

H

P

SOIC-7

751U

1

260

REEL

2500

Y

Flyback

Current Mode

100

Yes

9.5

Yes

Yes

Yes

28

500 / 500

$0.5193

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NCP1234AD65R2G

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CAD Model

Pb

A

H

P

SOIC-7

751U

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

500 / 500

Price N/A

More Details

NCP1234BD100R2G

Contact Sales

Active

CAD Model

Pb

A

H

P

SOIC-7

751U

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

500 / 500

$0.5193

More Details

NCP1234BD65R2G

Contact Sales

Active

CAD Model

Pb

A

H

P

SOIC-7

751U

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

500 / 500

$0.4388

More Details

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可靠性数据

Die Related Summary Data

Device: NCP1234AD100R2G

Equivalent to wafer fab process: VHVIC

产品技术

产品技术

等效器件小时

平均故障间隔时间/平均无故障时间（按小时计算）

FITS

VHVIC

2

2577173853

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Re-calculate Data

Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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