TDA4862 データシートの表示（PDF） - Infineon Technologies

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TDA4862

Power-Factor Controller (PFC) IC for High Power Factor and Active Harmonic Filter

Infineon Technologies 

TDA 4862

Functional Description (cont’d)

Undervoltage Lockout

An undervoltage lockout circuitry enables the output stage when VCC reaches the upper

threshold VCC and terminates the output stage when VCC is falling below the lower

threshold VCCL. In the standby mode the supply current is typically 75 µA. An internal

clamp has been added from VCC to ground to protect the IC from an overvoltage

condition. The external circuitry is created with a start-up resistor connected from VCC to

the input supply voltage and a storage capacitor from VCC to ground. Bootstrap power

supply is created with the previous mentioned auxiliary winding and a diode.

Output

The TDA 4862 totem pole output stage is MOSFET compatible. An internal protection

circuitry is activated when VCC 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.

6

2005-02-17

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