Low Power Offline Constant Current PWM Current-Mode Controller

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Overview

The NCP1361 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 NCP1361 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 Charging
  • Cell Phones
  • Tablets
  • Portable Devices
  • 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
  • Built-in soft-start
  • Low Start-up current ( 2 μA typ.)
  • Less than 30 mW No-Load Performance at High Line
  • These are Pb-Free Devices

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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

NCP1361AABAYSNT1G

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Active

CAD Model

Pb

A

H

P

TSOP-6

3

260

REEL

3000

Y

Flyback

Current Mode

Variable

Yes

6.5

Yes

Yes

Yes

28

2000 / 1000

$0.207

More Details

NCP1361BABAYSNT1G

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Lifetime

CAD Model

Pb

A

H

P

TSOP-6

3

260

REEL

3000

N

Flyback

Current Mode

Variable

Yes

6.5

Yes

No

Yes

28

2000 / 1000

$0.427

More Details

NCP1361EABAYSNT1G

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Active

CAD Model

Pb

A

H

P

TSOP-6

3

260

REEL

3000

Y

Flyback

Current Mode

Variable

Yes

6.5

Yes

No

Yes

28

2000 / 1000

$0.3598

More Details

NCP1361FABAYSNT1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-6

3

260

REEL

3000

N

Flyback

Current Mode

Variable

Yes

6.5

Yes

Yes

Yes

28

2000 / 1000

Price N/A

More Details

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