VIPER100 데이터 시트보기 (PDF) - STMicroelectronics
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VIPER100 Datasheet PDF : 23 Pages
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Figure 9: Oscillator
Rt
VDD
OSC
Ct
VIPer100/SP - VIPer100A/ASP
For Rt >1.2KΩ
and
Ct ≥ 15nF if FSW ≤ 40KHz
CLK
FSW
=
---2---.-3----
RtCt
⋅
1
–
R-----t-5--–--5--1-0---5---0--
FC00050
Ct
22nF
15nF
Forbidden area
880
Ct(nF) =
Fsw(kHz)
Forbidden area
40kHz
Fsw
1,000
Oscillator frequency vs Rt and Ct
FC00030
Ct = 1.5 nF
500
300
Ct = 2.7 nF
Ct = 4.7 nF
200
Ct = 10 nF
100
50
30
1
23
5
10
20 30 50
Rt (kΩ)
8/23
1
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