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FAN7530 데이터시트(PDF) 15 Page - Fairchild Semiconductor

부품명 FAN7530
상세설명  Interleaved Dual BCM PFC Controllers
Download  37 Pages
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN7530 데이터시트(HTML) 15 Page - Fairchild Semiconductor

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© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN9611 / FAN9612 • Rev. 1.1.3
15
9.
Input Voltage Sensing (VIN)
The input AC voltage is sensed at the VIN pin. The input
voltage is used in three functions: input under-voltage
lockout
(brownout
protection),
input
over-voltage
protection, and input voltage feedforward in the PWM
control circuit. All the functions require the RMS value of
the input voltage waveform. Since the RMS value of the
AC input voltage is directly proportional to its peak, it is
sufficient to find the peak instead of the more
complicated and slower method of integrating the input
voltage over a half line cycle. The internal circuit of the
VIN pin works with peak detection of the input AC
waveforms. One of the important benefits of this
approach is that the peak indicates the correct RMS
value even at no load when the HF filter capacitor at the
input side of the boost converter is not discharged
around the zero crossing of the line waveform. Another
notable benefit is that during line transients, when the
peak exceeds the previously measured value, the input-
voltage feedforward circuit can react immediately,
without waiting for a valid integral value at the end of the
half line period. Furthermore, lack of zero crossing
detection could fool the integrator while the peak
detector works properly during light-load operation.
The valid range for the peak of the AC input is between
approximately 0.925V and 3.7V. This range is optimized
for universal input voltage range of operation. If the
peak of the sense voltage remains below the 0.925V
threshold, input under-voltage or brownout condition is
declared and the FAN9611/12 stops operating. When
the VIN voltage exceeds 3.7V, the FAN9611/12 input
voltage sense circuit saturates and the feedforward
circuit is not able to follow the input any higher.
Consequently, the slope of the PWM ramp remains
constant corresponding to the VIN = 3.7V level
amplitude for any VIN voltage above 3.7V.
The input voltage is measured by a tracking analog-to-
digital converter, which keeps the highest value (peak
voltage) of the input voltage waveform. Once a
measurement is taken, the converter tracks the input for
at least 12ms before a new value is taken. This delay
ensures at least one new peak value is captured before
the new value is used.
Figure 23. Input Voltage Sensing Circuit
The measured peak value is then used in the following
half-line cycle while a new measurement is executed to
be used in the next half line cycle. This operation is
synchronized to the zero crossing of the line waveform.
Since the input voltage measurement is held steady
during the line half periods, this technique does not feed
any AC ripple into the control loop. If line zero crossing
detection is missing, the FAN9611/12 measures the
input voltage in every 32ms; it can operate from a DC
input as well. The following figures provide detail about
the input voltage sensing method of the controller.
As shown in the waveforms, input voltage feedforward is
instantaneous when the line voltage increases and has
a half line cycle delay when the input voltage decreases.
Any increase in input voltage would cause output over
voltage due to the slow nature of the voltage regulation
loop. This is successfully mitigated by the immediate
action of the input-voltage feedforward circuit.


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