Low Power Offline Constant Current PWM Current-Mode Controller with High Voltage Startup Current Source

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Overview

The NCP1366 offers a new solution targeting output power levels from a few watts up to 20 W in a universal-mains flyback application.Thanks to a novel method this new controller saves the secondary feedback circuitry for constant current regulation while achieving excellent line and load regulation with traditional opto coupler and TL431 voltage reference.The NCP1366 operates in valley lockout quasi-resonant peak current mode control mode at high load to provide high efficiency. When the power on the secondary side starts to diminish, the controller automatically adjusts the duty-cycle then at lower load the controller enters in pulse frequency modulation at fixed peak current with a valley switching detection. This technique allows keeping the output regulation with tiny dummy load. Valley lockout at the first 4 valleys prevent valley jumping operation and then a valley switching at lower load provides high efficiency.

  • AC-DC USB chargers for cell phones, tablets, and other portable devices
  • AC-DC USB chargers for cell phones, tablets, and other portable devices
  • 560-V Startup Current Source
  • No frequency clamp, 80 or 110 kHz Maximum Switching Frequency
  • Quasi-Resonant with Valley Switching Operation
  • Fixed Peak Current & Deep frequency foldback @ light load operation
  • Wide Operation VCC range (up to 28 V)
  • Cycle by Cycle peak current limit
  • CS & Vs/ZCD pin Short and Open Protection
  • Internal Temperature Shutdown
  • Constant Current Primary-side feedback eliminates secondary controller
  • ±10% Current Regulation
  • Clamped Gate-drive Output for Mosfet
  • Build-in soft-sart
  • Low Start-up current ( 2 μA typ.)
  • Less than 10 mW No-Load Performance at High Line with NCP1366 version
  • Less than 30 mW No-Load Performance at High Line with NCP1361 version
  • These are Pb-Free Devices

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Reference Price

NCP1366AABAYDR2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

6.5

Yes

Yes

Yes

28

2000 / 1000

$0.4037

More Details

NCP1366BABAYDR2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

6.5

Yes

No

Yes

28

2000 / 1000

$0.3694

More Details

NCP1366BABCYDR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

1

260

REEL

2500

N

Flyback

Current Mode

Variable

Yes

6.5

Yes

Yes

Yes

28

2000 / 1000

Price N/A

More Details

NCP1366EABAYDR2G

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Active

CAD Model

Pb

A

H

P

SOIC-7

3

260

REEL

2500

Y

Flyback

Current Mode

Variable

Yes

6.5

Yes

No

Yes

28

2000 / 1000

$0.2872

More Details

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