Offline Controllers | NCP1251

PWMコントローラ、電源モード、オフライン電源用

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Overview

NCP1251は高集積PWMコントローラで、頑丈で高性能のオフライン電源が小型のTSOP-6パッケージで実現できます。電源範囲は最大28 V、ピーク電流モード制御で動作するジッタード65 kHz/100 kHzのスイッチング回路をホストします。セカンダリ・サイドの電力が下がり始めると、スイッチング周波数を最低レベルの26 kHzまで自動的にフォールドバックします。電力がさらに下がると、スキップ・サイクルへ移行してピーク電流を制限します。過電力保護（OPP）は、無負荷スタンバイ要件でコンバータを仕様どおりに駆動する場合、特に困難です。当社独自の内蔵OPPなら、外部抵抗器2つだけで、スタンバイ性能に影響することなく最大供給電力を活用できます。ラッチされた過電圧保護（OVP）が同じピンに組み合わされています。実装しやすくするため、自動リカバリOVPでVccラインの監視もします。この機能により、オプトカプラの障害や反転開ループ動作が発生した場合、効率的に保護します。最後に、タイマベースのショート保護により最高の保護スキームを実現しているため、保護トリップ・ポイントを高精度で選択できます。補助巻線と電力巻線との間が疎結合であっても関係ありません。

  • Offline Adapters
  • AC-DC converters
  • 45W Adapter
  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks
  • Non-dissipative internal and adjustable Over Power Protection (OPP)
  • Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions
  • Internal Ramp Compensation
  • Frequency jittering from full load to skip-cycle
  • Latch input for OVP and OTP implementations
  • Over Voltage Protection (OVP) monitoring on the Vcc pin
  • See NCP1250 for no Over Voltage Protection (OVP) on the Vcc pin

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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)

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Reference Price

NCP1251ASN100T1G

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Obsolete

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

N

Flyback

Current Mode

100

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

NCP1251ASN65T1G

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Last Shipments

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

NCP1251BSN100T1G

Loading...

Active

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

Y

Flyback

Current Mode

100

Yes

8.8

Yes

OVP

Yes

28

300 / 500

$0.276

More Details

NCP1251BSN65T1G

Loading...

Active

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

Y

Flyback

Current Mode

65

Yes

8.8

Yes

OVP

Yes

28

300 / 500

$0.2382

More Details

NCP1251CSN65T1G

Loading...

Active

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

Y

Flyback

Current Mode

65

Yes

8.8

Yes

NO

Yes

28

300 / 500

$0.1682

More Details

NCP1251FSN65T1G

Loading...

Obsolete

CAD Model

Pb

A

H

P

TSOP-6

318G-02

1

260

REEL

3000

N

Flyback

Current Mode

65

Yes

8.8

Yes

Yes

Yes

28

300 / 500

Price N/A

More Details

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