产品概要
描述
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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性能一览
- 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
电路原理图
EDA Symbols, Footprints and 3D Models
STMicroelectronics - L4981
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | 符合RoHS级别 | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| L4981AD | Active 产品已量产 | SO-20 | Industrial | Ecopack2 | - | - | |
| L4981AD013TR | Active 产品已量产 | SO-20 | Industrial | Ecopack2 | - | - | |
| L4981BD | Active 产品已量产 | SO-20 | Industrial | Ecopack2 | - | - | |
| L4981BD013TR | Active 产品已量产 | SO-20 | Industrial | Ecopack2 | - | - |
(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此，它们可能不是100%适用于特定的设备。有关特定设备的信息，请联系 销售支持。
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Sample & Buy
| Part Number | 供货状态 | Budgetary Price (US$)*/Qty | 从ST订购 | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L4981BD | | | distributors 无法联系到经销商，请联系我们的销售办事处 | ||||||||||
| L4981BD013TR | | | distributors 无法联系到经销商，请联系我们的销售办事处 | ||||||||||
| L4981AD | | | distributors 无法联系到经销商，请联系我们的销售办事处 | ||||||||||
| L4981AD013TR | | | distributors 无法联系到经销商，请联系我们的销售办事处 |
L4981BD Active
L4981BD013TR Active
L4981AD Active
L4981AD013TR Active