Controller, Fixed Frequency, Current Mode, for Flyback Converters

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Overview

The NCP1246 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply. This function greatly simplifies the design of the auxiiary supply and the Vcc capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, stnad-by etc. This device contains a special HV detector which detects the application unplug from the AC input line and triggers the X2 discharge current. The HV structure also includes brown-out detection circuitry.
The NCP1246 features a timer-based fault detection that ensures the detection of overload and an adjustable power compensation to help keep the maximum power independent of the input voltage.
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 robust power supply designs.
A dedicated off mode allows the SMPS to reach extremely low no load input power consumption when combinded with secondary side contoller NCP4353 or NCP4354. When used together, the SMPS is capable of achieving <10 mW no load input power consumption. The secondary side contoller signals the NCP1246 to enter a sleep mode, minimizing the power consumption of the control circuitry.
This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.

  • AC-DC Adapters
  • LCD TV power supplies
  • Notebook Computers
  • Frequency foldback and skip mode
  • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
  • High-voltage startup with dynamic self supply
  • Integrated brown-out detection
  • Frequency Modulation
  • Adjustable overpower protection
  • Latch off input

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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

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Reference Price

NCP1246AD065R2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1246AD100R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1246ALD065R2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1246ALD100R2G

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

NCP1246BD065R2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

$0.5143

More Details

NCP1246BD100R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

$0.5143

More Details

NCP1246BLD065R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

65

Yes

8.9

Yes

Yes

Yes

28

500 / 800

$0.5143

More Details

NCP1246BLD100R2G

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

100

Yes

8.9

Yes

Yes

Yes

28

500 / 800

Price N/A

More Details

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