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VIPER20BSP Datasheet(PDF) 8 Page - STMicroelectronics

Part # VIPER20BSP
Description  SMPS PRIMARY I.C.
PDF  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER20BSP Datasheet(HTML) 8 Page - STMicroelectronics

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Figure 7: Oscillator
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
1
2
3
5
10
20
30
50
0.5
0.6
0.7
0.8
0.9
1
Rt (k
Ω)
Maximum duty cycle vs Rt
FC00040
Rt
Ct
OSC
VDD
CLK
FC00050
For R
T > 1.2 KΩ:
F
SW =
2.3
R
T CT
D
MAX
D
MAX = 1 −
550
R
T − 150
Recommended D
MAX values:
100KHz: > 80%
200KHz: > 70%
VIPer20B / VIPer20BSP
8/17



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