參數(shù)資料
型號(hào)： L6562A
廠商： 意法半導(dǎo)體
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Transition-mode PFC controller
中文描述： 過渡模式PFC控制器
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 343K
代理商： L6562A
Application information
L6562A
10/20
Example: Vo = 400V,
Vo = 40V. Then: R1 = 40V/27μA
≈
1.5M
;
R2 = 1.5 M
·2.5/(400-2.5) = 9.43k
. The tolerance on the OVP level due to the L6562A will
be 40·0.13 = 5.3V, that is ± 1.2%.
When the load of a PFC pre-regulator is very low, the output voltage tends to stay steadily
above the nominal value, which cannot be handled by the Dynamic OVP. If this occurs,
however, the error amplifier output will saturate low; hence, when this is detected the
external power transistor is switched off and the IC put in an idle state (Static OVP). Normal
operation is resumed as the error amplifier goes back into its linear region. As a result, the
device will work in burst-mode, with a repetition rate that can be very low.
When either OVP is activated the quiescent consumption of the IC is reduced to minimize
the discharge of the Vcc capacitor and increase the hold-up capability of the IC supply
system.
6.2
Disable function
The INV pin doubles its function as a not-latched IC disable: a voltage below 0.2V shuts
down the IC and reduces its consumption at a lower value. To restart the IC, the voltage on
the pin must exceed 0.45 V. The main usage of this function is a remote ON/OFF control
input that can be driven by a PWM controller for power management purposes. However it
also offers a certain degree of additional safety since it will cause the IC to shutdown in case
the lower resistor of the output divider is shorted to ground or if the upper resistor is missing
or fails open.
6.3
THD optimizer circuit
The device is equipped with a special circuit that reduces the conduction dead-angle
occurring to the AC input current near the zero-crossings of the line voltage (crossover
distortion). In this way the THD (Total Harmonic Distortion) of the current is considerably
reduced.
A major cause of this distortion is the inability of the system to transfer energy effectively
when the instantaneous line voltage is very low. This effect is magnified by the high-
frequency filter capacitor placed after the bridge rectifier, which retains some residual
voltage that causes the diodes of the bridge rectifier to be reverse-biased and the input
current flow to temporarily stop.
相關(guān)PDF資料
PDF描述
L6562AD Transition-mode PFC controller
L6562ADTR Transition-mode PFC controller
L6562AN Transition-mode PFC controller
L6563_07 Advanced transition-mode PFC controller
L6563A ADVANCED TRANSITION-MODE PFC CONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6562A_0708 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Transition-mode PFC controller
L6562AD 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Transition Mode PFC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6562ADTR 功能描述:功率因數(shù)校正 IC HV H-Bridge driver RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
L6562ADTR☞原裝☜ 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:深創(chuàng)輝科技，全新原裝L6562ADTR☞原裝☜
L6562AN 功能描述:功率因數(shù)校正 IC Low 2.5mA 30uA Transition Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
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