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| 型号： | TDA4863 |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 稳压器 |
| 英文描述： | POWER FACTOR CONTROLLER, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 27/27页 |
| 文件大小： | 302K |
| 代理商： | TDA4863 |
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TDA4863
Functional Description
Version 2.1
9
2005-02-18
2
Functional Description
2.1
Introduction
Conventional electronic ballasts and switch mode power supplies are designed with a
bridge rectifier and a bulk capacitor. Their disadvantage is that the circuit draws power
from the line when the instantaneous AC voltage exceeds the capacitors voltage. This
occurs near the line voltage peak and causes a high charge current spike with following
characteristics: The apparent power is higher than the real power that means low power
factor condition, the current spikes are non sinusoidal with a high content of harmonics
causing line noise, the rectified voltage depends on load condition and requires a large
bulk capacitor, special efforts in noise suppression are necessary.
With the TDA4863 preconverter a sinusoidal current is achieved which varies in direct
instantaneous proportional to the input voltage half sine wave and so provides a power
factor near 1. This is due to the appearance of almost any complex load like a resistive
one at the AC line. The harmonic distortions are reduced and comply with the IEC555
standard requirements.
2.2
IC Description
The TDA4863 contains a wide bandwidth voltage amplifier used in a feedback loop, an
overvoltage regulator, an one quadrant multiplier with a wide linear operating range, a
current sense comparator, a zero current detector, a PWM and logic circuitry, a totem-
pole MOSFET driver, an internal trimmed voltage reference, a restart timer and an
undervoltage lockout circuitry.
2.3
Voltage Amplifier
With an external capacitor between the pins VSENSE and VAOUT the voltage amplifier
forms an integrator. The integrator monitors the average output voltage over several line
cycles. Typically the integrators bandwidth is set below 20 Hz in order to suppress the
100 Hz ripple of the rectified line voltage. The voltage amplifier is internally compensated
and has a gain bandwidth of 5 MHz (typ.) and a phase margin of 80 degrees. The non-
inverting input is biased internally at 2.5 V. The output is directly connected to the
multiplier input.
The gate drive is disabled when VSENSE voltage is less than 0.2 V or VAOUT voltage
is less than 2.2 V.
If the MOSFET is placed nearby the controller switching interferences have to be taken
into account. The output of the voltage amplifier is designed in a way to minimize these
inteferences.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA4863_05 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:Power Factor Controller IC for High Power Factor and Low THD |
| TDA48632 | 功能描述:功率因数校正 IC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| TDA4863-2 | 功能描述:功率因数校正 IC BOOST CONTROLLER FOR HI PWR FACTOR/LW THD RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| TDA4863-2_05 | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:Power-Factor Controller (PFC) IC for High Power Factor and Low THD |
| TDA48632G | 功能描述:功率因数校正 IC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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