Offline Controllers | NCP1237

コントローラ、固定周波数、電流モード、フライバック・コンバータ用

Obsolete

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Overview

NCP1237 は、新世代の NCP12xx 固定周波数電流モード・コントローラで、ダイナミックセルフサプライ (DSS) が特長で、前の世代とのピン間の互換性があります。この DDS により、補助電源や VCC キャパシタの設計が大幅にシンプル化します。遷移のときに、内部スタートアップ電流源をアクティブ化して、コントローラへ供給します。独自の Soft-Skip™ モードと周波数フォールドバックを組み合わせることにより、軽負荷状態での優れた効率を示しながら、超低スタンバイ電力消費を達成します。このソフトスキップ機能は、音響ノイズのリスクも劇的に低減します。これにより、クランプ・ネットワークで安価なトランスとキャパシタを使用できます。NCP1237 は、コントローラが限られた時間に提供できる過渡ピーク電力の量を制御する、デュアルレベル・タイマベースの障害検出を備えています。内部周波数ジッタリング、ランプ補償、多用途ラッチ入力により、頑丈さとコンポーネント・コストが主な制約であるコンバータの有力候補となります。さらに、スタートアップ電流源と、整流 AC 線または DC フィルタ済みバルク電圧のどちらかからの入力電圧を感知できる電圧低下 / ライン OVP ディテクタを組み合わせた新しい高電圧回路を搭載しています。最後に、慎重な設計により、重要なパラメータの精度は全温度範囲 (-40°C 〜 + 125°C) にわたって適切に制御され、設計が容易になり、安全性が向上します (たとえば、ピーク電流制限には ±5%、発振器には ±7%)。

  • Ac-dc Adapters for Notebooks, LCD, and Printers
  • Offline Battery Chargers
  • Consumer Electronic Power Supplies
  • Auxiliary/Housekeeping Power Supplies

  • Timer-Based Transient Power and Overload Protections with AutoRecovery (Option B) or Latched (Option A) Operation
  • High-Voltage Current Source with DSS with Built-in Brown-out and Line Overvoltage Protections
  • Fixed-Frequency Current-Mode Operation with Built-in Ramp Compensation
  • Frequency Jittering
  • Adjustable Overpower Compensation
  • Latch-off Input for Severe Fault Conditions, with Direct Connection of an NTC for Overtemperature Protection (OTP)
  • Protection Against Winding Short-Circuit
  • Frequency Foldback transitioning into Soft-Skip
  • 65 kHz Oscillator (100 kHz and 133 kHz Versions Available Upon Request)
  • VCC Operation up to 28 V
  • Increased Precision on Critical Parameters
  • ±1.0 A Peak Current Drive Capability
  • 4.0 ms Soft-Start
  • Internal Thermal Shutdown with Hysteresis
  • These Devices are Pb-Free, Halogen free/BFR free and are ROHS compliant

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fsw Typ (kHz)

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Reference Price

NCP1237AD65R2G

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Obsolete

Similar Products
CAD Model

Pb

A

H

P

SOIC-7

751U

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

1000 / 1000

Price N/A

More Details

NCP1237BD65R2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-7

751U

1

260

REEL

2500

N

Flyback

Current Mode

65

Yes

9.5

Yes

Yes

Yes

28

1000 / 1000

Price N/A

More Details

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信頼性データ

Die Related Summary Data

Device: NCP1237AD65R2G

Equivalent to wafer fab process: VHVIC

製品技術

製品技術

等価デバイス時間

MTBF/MTTF (時間)

FITS

VHVIC

2

2577173853

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Re-calculate Data

Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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