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output power-, but also input voltage dependent. The higher the input voltage, the
smaller t
, so the higher the frequency will be.
PRIM
Figure:
Point P1 is the minimum frequency f
that occurs at the specified minimum input
MIN
voltage and maximum output power required by the application. Of course the minimum
frequency has to be chosen above the audible limit (>20 kHz).
Start-Up Sequence
When the rectified AC voltage V
(via the center tap connected to pin 8) reaches the
IN
Mains dependent operation level (Mlevel: between 60 and 100 V), the internal 'Mlevel
switch' will be opened and the start-up current source is enabled to charge
capacitorC2521 at the V
pin as shown below.
CC
The 'soft start' switch is closed when the V
reaches a level of 7 V and the 'soft start'
CC
capacitor C
(C2522, between pin 5 and the sense resistor R3526), is charged to 0.5
SS
V.
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