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TDA4862 Datasheet(PDF) 6 Page - Infineon Technologies AG

Part No. TDA4862
Description  Power-Factor Controller (PFC) IC for High Power Factor and Active Harmonic Filter
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com

 6 page
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TDA 4862
Functional Description (cont’d)
Undervoltage Lockout
An undervoltage lockout circuitry enables the output stage when
CC reaches the upper
CC and terminates the output stage when VCC is falling below the lower
CCL. In the standby mode the supply current is typically 75
µA. An internal
clamp has been added from
CC to ground to protect the IC from an overvoltage
condition. The external circuitry is created with a start-up resistor connected from
CC to
the input supply voltage and a storage capacitor from
CC to ground. Bootstrap power
supply is created with the previous mentioned auxiliary winding and a diode.
The TDA 4862 totem pole output stage is MOSFET compatible. An internal protection
circuitry is activated when
CC is within the stand by mode and ensures that the MOSFET
is turned-OFF. The totem pole output has been optimized to minimize cross conduction
current during high speed operation. The addition of two 4
Ω resistors, one in series with
the source output transistor and one in series with the sink output transistor, reduces the
cross conduction current.

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