Controller, Fixed Frequency, Current Mode, for Flyback Converters

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Overview

The NCP1236 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.
In addition, the controller includes a new high voltage circuitry that combines a startup current source and a brown-out detector able to sense the input voltage either from the rectified ac line or the dc filtered bulk voltage. The high voltage sensing circuitry is used for the overpower protection purposes as well. Overpower protection, overload protection, and other protective features increase the safety and reliability of the final application.

  • AC-DC Adapters
  • Consumer Electronics Power Supplies
  • Auxiliary/Housekeeping power supplies
  • Notebooks
  • LCD TVs
  • Printers
  • 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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6

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

NCP1236AD100R2G

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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

$0.3895

More Details

NCP1236AD65R2G

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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

$0.3608

More Details

NCP1236BD100R2G

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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

$0.315

More Details

NCP1236BD65R2G

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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

$0.3608

More Details

NCP1236DD65R2G

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Last Shipments

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

Price N/A

More Details

NCP1236ED100R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

10.5

Yes

Yes

Yes

28

500 / 500

Price N/A

More Details

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