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VIPER100A-E Datasheet(PDF) 18 Page - STMicroelectronics

Part No. VIPER100A-E
Description  SMPS PRIMARY I.C.
Download  31 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER100A-E Datasheet(HTML) 18 Page - STMicroelectronics

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5 Operation Description
VIPer100A-E/ASP-E
18/31
Figure 14. Oscillator
Rt
Ct
OSC
VDD
CLK
FC 0005 0
Ct
Fsw
40kHz
15nF
22nF
Forbidden area
Forbidden area
Ct(nF) =
Fsw(kHz)
880
1
2
3
5
10
20
30
50
30
50
100
200
300
500
1,000
Rt (k
Ω)
Oscillator frequency vs Rt and Ct
Ct = 1.5 nF
Ct = 2.7 nF
Ct = 4.7 nF
Ct = 10 nF
FC00030
FC00030
For Rt > 1.2kΩ and Ct ≤ 40KHz
F
SW
2.3
R
tCt
-----------1
550
R
t
150
--------------------
⎝⎠
⎛⎞
=


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