L4981 L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode
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
技术特性
- CONTROL BOOST PWM UP TO 0.99P.F.
- LIMIT LINE CURRENT DISTORTION TO < 5%
- UNIVERSAL INPUT MAINS
- FEED FORWARD LINE AND LOAD REGULATION
- AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY
- HIGH CURRENT BIPOLAR AND DMOS TOTEM POLE OUTPUT
- LOW START-UP CURRENT (0.3mA TYP.)
- UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
- OVERVOLTAGE, OVERCURRENT PROTECTION
- PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
- SOFT START
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功能框图
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L4981 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| L4981AD |
Active |
|
1000 |
SO-20 |
Tube |
|
|
| L4981AD013TR |
Active |
|
1000 |
SO-20 |
Tape And Reel |
|
|
| L4981BD013TR |
Active |
|
1000 |
SO-20 |
Tape And Reel |
|
|
| L4981A |
Active |
|
1000 |
PDIP 20 |
Tube |
|
|
| L4981BD |
Active |
|
1000 |
SO-20 |
Tube |
|
|
| L4981B |
Active |
|
1000 |
PDIP 20 |
Tube |
|
|
DATASHEET
| 描述 |
版本 |
大小 |
| L4981 : POWER FACTOR CORRECTOR |
6 |
2621KB |
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN829: Semiconductor kit for power factor corrector |
3 |
97KB |
| AN832: L4981A synchronization |
1 |
29KB |
| AN833: FREQUENCY MODULATION ON L4981B |
1 |
28KB |
| AN628: Designing a high power factor switching preregulator with the L4981 continuous mode |
9 |
781KB |
| AN510: Circuits for power factor correction with regards to mains filtering |
1 |
410KB |
| AN2649: A power factor corrector with MDmesh™ II and SiC diode |
2 |
768KB |
| AN827: A 500W high power factor with the L4981A continuous mode IC |
1 |
243KB |
| AN1606: A "bridgeless PFC configuration" based on L4981 PFC controller |
3 |
284KB |
| AN828: 1500W - 440V power factor corrector preregulator |
3 |
36KB |
SIMULATORS
