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AN4213 데이터시트(PDF) 9 Page - STMicroelectronics

부품명 AN4213
상세설명  Fluorescent lamps are increasingly driven by electronic
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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AN4213 데이터시트(HTML) 9 Page - STMicroelectronics

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AN4213
Designing a TM PFC
3
Designing a TM PFC
3.1
Input specification
The first consideration for designing a new boost PFC converter is a detailed specification of
the operating conditions of the circuit that is needed for the calculation.
In this example a 116 W, single-input range mains PFC circuit has been considered.
The L6562A integrates an OVP in order to prevent excessive output voltage that can
overstress the output components and the load.
•
Maximum output overvoltage:
The PFC minimum switching frequency is one of the main parameters used to dimension
the boost inductor. The switching frequency at low mains on the top of the sinusoid and at
full load conditions has been considered. It must be higher than the audio bandwidth in
order to avoid audible noise and it must not interfere with the L6562A minimum internal
starter period. On the other hand, if the minimum frequency is set too high, the circuit shows
excessive losses at a higher input voltage. The typical minimum frequency range is 20 - 50
kHz.
•
Minimum switching frequency (kHz):
In order to properly select the power components of the PFC, the maximum operating
ambient temperature around the PFC circuitry must be known. The designer must take into
consideration that it is the temperature at which the PFC components are working and not
the maximum external operating temperature of the entire equipment.
•
Maximum ambient temperature (°C):
Table 1. Specified parameters
Converter specification data and fixed parameters
Symbol
Description
Values
V
AC(min)
Mains voltage range
185 V
AC
V
AC(max)
265 V
AC
fl
Minimum mains frequency
47 Hz
P
OUT
Rated output power
116 W
V
OUT
Regulated DC output voltage
400 V
η
=P
OUT
/P
IN
Expected efficiency
90%
PF
Expected power factor
0.99
V
V
OVP
40
=
Δ
kHz
f
SW
35
min
=
C
T
ambx
°
= 50



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