VIPER20-E STMicroelectronics, VIPER20-E Datasheet - Page 18

• Manufacturer Part Number: VIPER20-E
• Description: IC SWIT SMPS CM OTP PENTAWATT5
• Manufacturer: STMicroelectronics
• Series: VIPER™r

Specifications of VIPER20-E

• Output Isolation: Isolated
• Frequency Range: 90 ~ 200kHz
• Voltage - Input: 8 ~ 15 V
• Voltage - Output: 620V
• Power (watts): 57W
• Operating Temperature: 25°C ~ 125°C
• Package / Case: Pentawatt-5 HV (Bent and Staggered Leads)
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6794-5; VIPER20-E

5 Operation Description
Figure 14. Oscillator
18/31
Ct
R t
O SC
C t
22nF
15nF
1,000
500
300
200
100
50
30
VDD
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
Forbidden area
5
FC 00050
Rt (kΩ)
40kHz
CLK
10
Ct(nF) =
For R
F
20
SW
FC00030
FC00030
Fsw(kHz)
t
=
> 1.2k Ω and C
880
30
---------- -
R
2.3
t
C
t
50
⋅
⎛
1
Fsw
–
------------------- -
R
t
550
–
t
150
≤ 40KHz
⎞
⎠
VIPer20-E/DIP-E