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UCC2817APWRG4 Datasheet(PDF) 9 Page - Texas Instruments

Part # UCC2817APWRG4
Description  BiMOS POWER FACTOR PREREGULATOR
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC2817APWRG4 Datasheet(HTML) 9 Page - Texas Instruments

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UCC2817A, UCC2818A
UCC3817A, UCC3818A
SLUS577C − SEPTEMBER, 2003 − REVISED MARCH 2009
9
www.ti.com
APPLICATION INFORMATION
Power Stage
LBOOST : The boost inductor value is determined by:
L
BOOST +
V
IN(min)
D
(
DI
f
s)
where D is the duty cycle,
∆I is the inductor ripple current and fS is the switching frequency. For the example
circuit a switching frequency of 100 kHz, a ripple current of 875 mA, a maximum duty cycle of 0.688 and a
minimum input voltage of 85 VRMS gives us a boost inductor value of about 1 mH. The values used in this
equation are at the peak of low line, where the inductor current and its ripple are at a maximum.
COUT : Two main criteria, the capacitance and the voltage rating, dictate the selection of the output capacitor.
The value of capacitance is determined by the holdup time required for supporting the load after input ac voltage
is removed. Holdup is the amount of time that the output stays in regulation after the input has been removed.
For this circuit, the desired holdup time is approximately 16 ms. Expressing the capacitor value in terms of output
power, output voltage, and holdup time gives the equation:
C
OUT +
2
P
OUT
Dt
V
OUT
2 * V
OUT(min)
2
In practice, the calculated minimum capacitor value may be inadequate because output ripple voltage
specifications limit the amount of allowable output capacitor ESR. Attaining a sufficiently low value of ESR often
necessitates the use of a much larger capacitor value than calculated. The amount of output capacitor ESR
allowed can be determined by dividing the maximum specified output ripple voltage by the inductor ripple
current. In this design holdup time was the dominant determining factor and a 220-
µF, 450-V capacitor was
chosen for the output voltage level of 385 VDC at 250 W.
(2)
(3)


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