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VIPER50-E

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
Obsolete Product(s) - Obsolete Product(s)
5 Operation Description VIPer50-E
16/29
Figure 11. Behaviour of the high voltage current source at start-up
Figure 12. Start-Up Waveforms
Ref.
UNDERVOLTAGE
LOCK OUT LOGIC
15 mA1 mA
3 mA
2 mA
15 mA
VDD
DRAIN
SOURCE
VIPer50
Auxiliary primary
winding
VDD
t
V
DDoff
VDDon
Start up duty cycle ~ 12%
C
VDD
FC0032
0
Obsolete Product(s) - Obsolete Product(s)
VIPer50-E 5 Operation Description
17/29
Figure 13. Over-temperature Protection
SC 101 91
T
J
T
tsd
-T
h yst
T
ts c
V
dd
V
dd on
V
dd off
I
d
V
co m p
t
t
t
t
Obsolete Product(s) - Obsolete Product(s)
5 Operation Description VIPer50-E
18/29
Figure 14. Oscillator
Rt
C
t
OSC
VDD
~360
Ω
CLK
FC00050
C
t
Fs
w
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
)
Frequency (kHz)
Oscillator frequency vs Rt and Ct
Ct = 1.5 nF
Ct = 2.7 nF
Ct = 4.7 nF
Ct = 10 nF
FC00030FC00030
For R
t
> 1.2kΩ and C
t
≤ 40KHz
F
SW
2.3
R
t
C
t
-----------1
550
R
t
150–
--------------------–
⋅=
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

VIPER50-E

Mfr. #:
Buy VIPER50-E
Manufacturer:
STMicroelectronics
Description:
AC/DC Converters SMPS PRIMARY IC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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