Quasi-Resonant Flyback Controller with Valley Lock-Out Switching

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Overview

The NCP1342 is a highly integrated quasi-resonant flyback controller suitable for designing high-performance off-line power converters. With an integrated active X2 capacitor discharge feature, the NCP1342 can enable no-load power consumption below 30 mW.

The NCP1342 features proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1342 enters quiet-skip mode to manage the power delivery while minimizing acoustic noise.

To ensure light load performance with high frequency designs, the NCP1342 incorporates Minimum Peak Current Modulation (MPCM) to reduce the switching frequency quickly. To help ensure converter ruggedness, the NCP1342 implements several key protective features such as internal brownout detection, a non-dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched overvoltage and NTC-ready overtemperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the ac line is removed.

  • Medium or High Power AC-DC Adapters
  • Ultra High Density AC-DC Adapters
  • USB PD Compliant
  • Notebook Adapters
  • Flat TV SMPS
  • Computer Power Supplies
  • Phone and Tablet Adapters
  • Minimum Peak Current Modulation for Rapid Frequency Foldback (RFF)
  • QR Frequency Jittering
  • Quiet-Skip Technology
  • Integrated HV Startup with Brownout Protection
  • Valley Switching Operation with Valley Lockout
  • Integrated X2 Capacitor Discharge Capability
  • NTC Compatible Fault Pin
  • High Drive Capability: -500 mA / +800 mA
  • Latch input for OVP and OTP implementation

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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

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Drive Cap. (mA)

Reference Price

NCP1342ADDCDAD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.56

More Details

NCP1342AMAACD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.4984

More Details

NCP1342AMDADGD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.493

More Details

NCP1342AMDCCDR2G

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Active

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.4543

More Details

NCP1342AMDCDAD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.4912

More Details

NCP1342AMDCDD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.483

More Details

NCP1342AMDCDHD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.483

More Details

NCP1342ANACCED1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.493

More Details

NCP1342ANACECD1R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

N

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

Price N/A

More Details

NCP1342ANACED1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.493

More Details

NCP1342ANDAAD1R2G

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Lifetime

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

N

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.483

More Details

NCP1342ANDBDD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.483

More Details

NCP1342ANDCDAD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

No

Yes

30

500 / 800

$0.5695

More Details

NCP1342BKDCDAD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.493

More Details

NCP1342BMDCDAD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.493

More Details

NCP1342BMDCDD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.5007

More Details

NCP1342BMDCDDD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.493

More Details

NCP1342DADBDD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.4893

More Details

NCP1342DADBDGD1R2G

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Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.5673

More Details

NCP1342ENACEFD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.483

More Details

NCP1342ENDCEAD1R2G

Loading...

Active

CAD Model

Pb

A

H

P

SOIC-9 NB

1

260

REEL

2500

F

Flyback

Current Mode

Variable

Yes

9

Yes

Yes

Yes

30

500 / 800

$0.483

More Details

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