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PDF TDA4863 Data sheet ( Hoja de datos )
| Número de pieza | TDA4863 | |
| Descripción | Boost Controller | |
| Fabricantes | Infineon Technologies | |
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Data Sheet, Rev.2, Feb. 2005
Boost Controller
TDA4863
Power Factor Controller
IC for High Power Factor
and Low THD
Power Management & Supply
Never stop thinking.
http://www.Datasheet4U.com
1 page  
AC line
RF-Filter
and
Rectifier
TDA4863
Overview
DC Output
Volage
TDA4863
GND
Figure 1 Typical application
1.3 Description
The TDA4863 IC controls a boost converter in a way that sinusoidal current is taken from
the single phase line s upply and stabilized DC volt age is available at the out put. This
active harmonic f ilter li mits the harmonic current s resulting from th e capacitor pulsed
charge currents during rectification. The power factor which describes the ratio between
active and apparent power is almost one. Line voltage fluctuations can be compensated
very efficiently.
Data Sheet
5 Rev.2, 2005-02
5 Page 
TDA4863
Functional Description
To prevent false tripping the zero current detector is designed as a Schmitt-Trigger with
a hysteresis of 0. 5 V. An in ternal 5 V clamp pr otects the input from overvoltage
breakdown, a 0.6 V clamp prev ents substrate in jection. An external resistor has to be
used in series with the auxiliary winding to limit the current through the clamps.
2.8 Restart Timer
The restart timer function eliminates the need of an oscillator. The timer starts or restarts
the TDA4863 when the driver output has been off for more than 150 µs after the inductor
current reaches zero.
2.9 Undervoltage Lockout
An undervoltage lockout circuitry swit ches the IC on when VCC reaches the upper
threshold VCCH and switches the IC off whenVCC is falling belowthe lower thresholdVCCL.
During start up the supply current is less then 100 µA.
An in ternal voltag e cl amp has been added to pr otect the IC from VCC overvoltage
condition. When using this clamp special care must be taken on power dissipation.
Start up current is provided by an external start up resistor which is connected from the
AC line to the input supply voltage VCC and a storage capacitor which is connected from
VCC to ground. Be aware that this capacitor is discharged before the IC is plugged into
the application boar d. Otherw ise the IC can be destr oyed due to the high capacitor
voltage.
Bootstrap power supply is created with the previous mentioned auxiliary winding and a
diode (see “Application Circuit” on Page 21).
2.10 Gate Drive
The TDA4863 totem pole output stage is M OSFET compatible. An internal pr otection
ciruitry is activated when VCC is within the start up phase and ensures that the MOSFET
is turned off. The totem pole output has been optimized to minimize cross conduction
current during high speed operation.
Data Sheet
11 Rev.2, 2005-02
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet TDA4863.PDF ] | |
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