VIPER25HN STMicroelectronics, VIPER25HN Datasheet - Page 17

• Manufacturer Part Number: VIPER25HN
• Description: IC OFFLINE CONV PWM OVP 7DIP
• Manufacturer: STMicroelectronics
• Series: VIPer™ plusr

Specifications of VIPER25HN

• Output Isolation: Isolated
• Frequency Range: 200 ~ 250kHz
• Voltage - Input: 8.5 ~ 23.5 V
• Voltage - Output: 800V
• Power (watts): 24W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Input Voltage: 8.5 V to 23.5 V
• Switching Frequency: 225 KHz
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-9073-5

VIPER25
As soon as the output voltage reaches the regulated value, the regulation loop takes over
and the drain current is regulated below its limit, I
at a value lower than the threshold V
Figure 22. I
Figure 23. Timing diagram: normal power-up and power-down sequences
V
V
I
DRAIN_START
DD(RESTART)
DDch
V
DRAIN
V
(3mA)
I
V
DDch
DDoff
DDon
V
V
I
DD
DD
IN
V
(-3 mA)
DRAIN
V
V
V
V
V
V
V
FBolp
FBbm
I
DDon
DDoff
FBlin
I
I
DD
DD1
DD0
DD
START- UP
FB
DD
current during start-up and burst mode
Power-on
NORMAL MODE
Doc ID 15585 Rev 4
FBlin
Normal operation
Dlim
BURST MODE
, by the feedback voltage, which settles
regulation is lost here
Power-off
Operation description
V
HV startup is no more activated
IN
< V
DRAIN_START
NORMAL MODE
t
t
t
t
V
time
time
time
time
FBbmhys
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