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參數資料
| 型號： | L6562ATN |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDIP8 |
| 封裝： | ROHS COMPLIANT, DIP-8 |
| 文件頁數： | 6/25頁 |
| 文件大?。?/td> | 488K |
| 代理商： | L6562ATN |
Application information
L6562AT
14/25
Figure 19.
THD optimization: standard TM PFC controller (left side) and L6562AT
(right side)
To overcome this issue the circuit embedded in the device forces the PFC pre-regulator to
process more energy near the line voltage zero-crossings as compared to that commanded
by the control loop. This will result in both minimizing the time interval where energy transfer
is lacking and fully discharging the high-frequency filter capacitor after the bridge. The effect
of the circuit is shown in figure 2, where the key waveforms of a standard TM PFC controller
are compared to those of the L6562AT.
Essentially, the circuit artificially increases the ON-time of the power switch with a positive
offset added to the output of the multiplier in the proximity of the line voltage zero-crossings.
This offset is reduced as the instantaneous line voltage increases, so that it becomes
negligible as the line voltage moves toward the top of the sinusoid.
To maximally benefit from the THD optimizer circuit, the high-frequency filter capacitor after
the bridge rectifier should be minimized, compatibly with EMI filtering needs. A large
capacitance, in fact, introduces a conduction dead-angle of the AC input current in itself -
even with an ideal energy transfer by the PFC pre-regulator - thus making the action of the
optimizer circuit little effective.
Imains
Vdrain
Imains
Vdrain
Input current
MOSFET's drain voltage
Rectified mains voltage
Input current
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| L6563 | 0.003 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDSO14 |
| L6563A | 0.003 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDSO14 |
| L6566BH | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6585D | 0.6 A POWER FACTOR AND FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6585DTR | 0.6 A POWER FACTOR AND FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L6562D | 功能描述:功率因數校正 IC Trans Mode PFC Cont RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6562DTR | 功能描述:功率因數校正 IC Trans Mode PFC Cont RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6562DTR☞㊣☜ | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:深創(chuàng)輝科技L6562DTR☞㊣☜現貨 |
| L6562N | 功能描述:功率因數校正 IC Trans Mode PFC Cont RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563 | 功能描述:功率因數校正 IC POWER SUPPLY RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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