Controller, Fixed Frequency, Current Mode, for Flyback Converters

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Overview

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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4

Product

Status

CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

Topology

Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

Latch

Soft Start

VCC Max (V)

Drive Cap. (mA)

Reference Price

NCP1234AD100R2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

100

Yes

9.5

Yes

Yes

Yes

28

500 / 500

$0.5193

More Details

NCP1234AD65R2G

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Lifetime

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

500 / 500

$0.4608

More Details

NCP1234BD100R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

500 / 500

$0.5193

More Details

NCP1234BD65R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-7

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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