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| HA16666P Datasheet, PDF (10/15 Pages) Hitachi Semiconductor – 600kHz PWM Controlled Switching Regulator | |||
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HA16666P/FP
Formula for the oscillation frequency
HA16666
Vref
OSC
CT RT1 RT2 Out
RT2
CT
RT1
Frequency vs. RT1, RT2 Dependence
800 k
CT
120 pF
180 pF
100 k
HA16666 summary formula of the oscillation ferquency
log (f) â a à log (RT1) + b
430 pF
(= RT2)
The following table show empirical values of
a and b for different values of CT.
CT
a
b
180pF
â0.50
7.58
330pF
â0.61
7.86
1000pF
â0.75
8.09
0.01µF
â0.86
7.57
0.15µF
â0.86
6.45
10 k
1000 pF
3300 pF
0.01 µF
1k
0.033 µF
0.15 µF
5
10
20 30 40 50
R T1 = R T2 (k â¦)
10
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