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- Oscillator Frequency
Oscillator Frequency is determined by the values of Rt and Ct in the circuit. These values also
determine the oscillation wave tilt and the off time of frequency. Osillation frequency is obtained
using the following formula.
1
f
osc =
t
RAMP
t
= C
x R
RAMP
t
t
In the SMPS circuit, the oscillation frequency is as follows:
f
osc =
nF
2 2
.
*
R
( R59 : 1/8W 20K ) , C
t
Samsung Electronics
Picture 2. PFC Drive FET(2SK2372) Gate pulse
x 0.51
= 59.417kHz
1
k
20
* .
0 51
( C14 : MLCC 222 )
t
Circuit Operation Description
5-7
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