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VIPER50SP Datasheet(PDF) 8 Page - STMicroelectronics

Part # VIPER50SP
Description  SMPS PRIMARY I.C.
Download  23 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER50SP Datasheet(HTML) 8 Page - STMicroelectronics

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VIPer50/SP - VIPer50A/ASP
Figure 9: Oscillator
1
Rt
Ct
OSC
VDD
CLK
FC00050
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 ≥ 15nF if FSW ≤ 40KHz
F
SW
2.3
R
t Ct
------------
1
550
R
t
150
–
----------------------
–


⋅
=
Ct
Fsw
40kHz
15nF
22nF
Forbidden area
Forbidden area
Ct(nF) =
Fsw(kHz)
880


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