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TDA4862 データシート(PDF) 6 Page - Siemens Semiconductor Group

部品番号 TDA4862
部品情報  Power-Factor Controller PFC IC for High Power Factor and Active Harmonic Filter
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メーカー  SIEMENS [Siemens Semiconductor Group]
ホームページ  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

TDA4862 データシート(HTML) 6 Page - Siemens Semiconductor Group

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TDA 4862
Semiconductor Group
6
1998-02-16
Functional Description (cont’d)
Undervoltage Lockout
An undervoltage lockout circuitry enables the output stage when
V
CC reaches the upper
threshold
V
CC and terminates the output stage when VCC is falling below the lower
threshold
V
CCL. In the standby mode the supply current is typically 75 µA. An internal
clamp has been added from
V
CC to ground to protect the IC from an overvoltage
condition. The external circuitry is created with a start-up resistor connected from
V
CC to
the input supply voltage and a storage capacitor from
V
CC 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
V
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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