參數(shù)資料
型號： TDA4863G
廠商： INFINEON TECHNOLOGIES AG
元件分類： 穩(wěn)壓器
英文描述： POWER FACTOR CONTROLLER, PDSO8
封裝： PLASTIC, DSO-8
文件頁數(shù)： 2/27頁
文件大?。?/td> 302K
代理商： TDA4863G
TDA4863
Functional Description
Version 2.1
10
2005-02-18
2.4
Overvoltage Regulator
Because of the integrators low bandwidth fast changes of the output voltage can’t be
regulated within an adequate time. Fast output changes occur during initial start-up,
sudden load removal, or output arcing. While the integrators differential input voltage
remains zero during this fast changes a peak current is flowing through the external
capacitor into pin VAOUT. If this current exceeds an internal defined margin the
overvoltage regulator circuitry reduces the multiplier output voltage. As a result the on
time of the MOSFET is reduced.
2.5
Multiplier
The one quadrant multiplier regulates the gate driver with respect of the DC output
voltage and the AC half wave rectified input voltage. Both inputs are designed to achieve
good linearity over a wide dynamic range to represent an AC line free from distortion.
Special efforts are made to assure universal line applications with respect to a 90 to
270 V AC range.
The multiplier output is internally clamped at 1.3 V. So the MOSFET is protected against
critical operating during start up.
2.6
Current Sense Comparator, LEB and RS Flip-Flop
An external sense resistor transfers the source current of the MOSFET into a sense
voltage.The multiplier output voltage is compared with this sense voltage.
To protect the current comparator input from negative pulses a current source is inserted
which sends current out of the ISENSE pin every time when VISENSE-signal is falling
below ground potential. The switch-on current peak of the MOSFET is blanked out via a
leading edge blanking circuit with a blanking time of typically 200 ns.
The RS Flip-Flop ensures that only one single switch-on and switch-off pulse appears at
the gate drive output during a given cycle (double pulse suppression).
2.7
Zero Current Detector
The zero current detector senses the inductor current via an auxiliary winding and
ensures that the next on-time of the MOSFET is initiated immediately when the inductor
current has reached zero. This diminishes the reverse recovery losses of the boost
converter diode. The MOSFET is switched off when the voltage drop of the shunt resistor
reaches the voltage level of the multiplier output. So the boost current waveform has a
triangular shape and there are no deadtime gaps between the cycles. This leads to a
continuous AC line current limiting the peak current to twice of the average current.
To prevent false tripping the zero current detector is designed as a Schmitt-Trigger with
a hysteresis of 0.5 V. An internal 5 V clamp protects the input from overvoltage
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