VIPER100/SP STMICROELECTRONICS [STMicroelectronics], VIPER100/SP Datasheet - Page 8
VIPER100/SP
Manufacturer Part Number
VIPER100/SP
Description
SMPS PRIMARY I.C.
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.VIPER100SP.pdf
(23 pages)
- Current page: 8 of 23
- Download datasheet (407Kb)
Figure 9:
Ct
Rt
Oscillator
OSC
VDD
1,000
C t
500
300
200
100
22nF
15nF
50
30
1
Ct = 1.5 nF
Ct = 4.7 nF
Ct = 2.7 nF
Ct = 10 nF
Forbidden area
2
Oscillator frequency vs Rt and Ct
3
FC00050
CLK
Forbidden area
5
Rt (k )
40kHz
10
For R
and
C
Ct(nF) =
F SW
t
15nF if F
t
Fsw(kHz)
>1.2K
880
=
20
VIPer100/SP - VIPer100A/ASP
----------- -
R
FC00030
FC00030
2.3
t
30
C
SW
t
Fsw
1
50
40KHz
–
--------------------- -
R
t
550
–
150
8/23
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