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TDA4863G Datasheet(PDF) 10 Page - Infineon Technologies AG

Part No. TDA4863G
Description  Boost Controller
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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TDA4863
Functional Description
Data Sheet
10
V1.0, 2003-05
2.4
Overvoltage Regulator
Because of the integrator´s 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 integrator´s 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 have been made to assure universal line applications with respect to a 90
to 270 V AC range.
The multiplier output is internally clamped to1.3 V. So the MOSFET is protected against
critical operating during start up.
2.6
Current Sense Comparator, LEB and RS Flip-Flop
The source current of the MOS transistor is transferred into a sense voltage via the
external sense resistor. The multiplier output voltage is compared with this sense
voltage. Switch on time of the MOS transistor is determined by the comparision result
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 V
ISENSE-signal is falling
below ground potential. An internal RC-filter is connected at the ISENSE pin which
smoothes the switch-on current spike.The remaining switch-on current spike is blanked
out via a leading edge blanking circuit with a blanking time of typ. 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 reduces the reverse recovery losses of the boost
converter diode to a minimum. The MOSFET is switched off when the voltage drop of
the shunt resistor exceeds 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.




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