Product overview
概要
The L4981 I.C. provides the necessary features to achieve a very high power factor up to 0.99.
Realized in BCD 60II technology this power factor corrector (PFC) pre-regulator contains all the control functions for designing a high efficiency-mode power supply with sinusoidal line current consumption.
The L4981 can be easily used in systems with mains voltages between 85V to 265V without anyline switch. This new PFC offers the possibility to work at fixed frequency (L4981A) or modulated frequency (L4981B) optimizing the size of the input filter; both the operating frequency modes working with an average current mode PWM controller, maintaining sinusoidal line current without slope compensation.
Besides power MOSFET gate driver, precise voltage reference (externally available), error amplifier, under voltage lockout, current sense and the soft start are included. To limit the number of the external components, the device integrates protections as overvoltage and overcurrent. The overcurrent level can be programmed using simple resistor for L4981A. For a better precision and for L4981B an external divider must be used.
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All features
- PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
- OVERVOLTAGE, OVERCURRENT PROTECTION
- SOFT START
- LOW START-UP CURRENT (0.3mA TYP.)
- HIGH CURRENT BIPOLAR AND DMOS TOTEM POLE OUTPUT
- CONTROL BOOST PWM UP TO 0.99P.F.
- UNIVERSAL INPUT MAINS
- LIMIT LINE CURRENT DISTORTION TO < 5%
- AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY
- UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
- FEED FORWARD LINE AND LOAD REGULATION
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EDA Symbols, Footprints and 3D Models
STMicroelectronics - L4981
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHSコンプライアンスグレード | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| L4981AD | Active 交換品交換品 | SO-20 | Industrial | Ecopack2 | - | - | |
| L4981AD013TR | Active 交換品交換品 | SO-20 | Industrial | Ecopack2 | - | - | |
| L4981BD | Active 交換品交換品 | SO-20 | Industrial | Ecopack2 | - | - | |
| L4981BD013TR | Active 交換品交換品 | SO-20 | Industrial | Ecopack2 | - | - |
(**) st.comで提供している材料宣誓書は、パッケージ･ファミリ内で最も一般的に使用されているパッケージに基づく汎用ドキュメントの場合があります。そのため、特定の製品では100%正確ではない可能性があります。特定の製品情報については、セールスサポートまでお問い合わせください
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Sample & Buy
| Part Number | 製品ステータス | Budgetary Price (US$)*/Qty | STから購入 | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L4981BD | | | distributors 販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください | ||||||||||
| L4981BD013TR | | | distributors 販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください | ||||||||||
| L4981AD | | | distributors 販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください | ||||||||||
| L4981AD013TR | | | distributors 販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください |
L4981BD Active
販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください
L4981BD013TR Active
販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください
L4981AD Active
販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください
L4981AD013TR Active
販売代理店に在庫がない場合は、STのセールス･オフィスまでお問い合わせください
（*）概算用の参考価格（US$）です。現地通貨でのお見積りについては、STのセールス･オフィスまたは販売代理店までお問い合わせください。