Switching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz

VIPER28HE

Manufacturer Part NumberVIPER28HE
DescriptionSwitching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz
ManufacturerSTMicroelectronics
VIPER28HE datasheet
 

Specifications of VIPER28HE

Output Voltage800 VOutput Current3 A
Output Power20 WInput Voltage8.5 V to 23.5 V
Switching Frequency115 KHzOperating Temperature Range- 40 C to + 150 C
Mounting StyleThrough HolePackage / CaseSDIP-10
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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VIPER28
Where:
V
is the OVP threshold (see
OVP
V
is the converter output voltage value to activate the OVP set by designer
OUT OVP
N
is the auxiliary winding turns
AUX
N
is the secondary winding turns
SEC
V
is the secondary diode forward voltage
DSEC
V
is the auxiliary diode forward voltage
DAUX
R
together R
OVP
Than, fixed R
LIM,
Equation 4
The resistor values will be such that the current sourced and sunk by the CONT pin be
within the rated capability of the internal clamp.
Figure 22. OVP timing diagram
V
V
DS
DS
V AUX
0
0
V CONT
V
OVP
2 µs
2 µs
STROBE
STROBE
OVP
OVP
COUNTER
COUNTER
RESET
RESET
COUNTER
COUNTER
STATUS
STATUS
0
0
0
0
FAULT
FAULT
N
N
O
O
R
R
M
M
A
A
L
L
O
O
P
P
Table 8 on page
make the output voltage divider
LIM
according to the desired I
, the R
Dlim
R
=
R
OVP
LIM
0.5 µs
0.5 µs
0 →1
0 →1
1 →2
1 →2
2 →0
2 →0
0
0
E
E
R
R
A
A
T
T
O I
O I
N
N
T
T
E
E
M
M
P
P
O
O
R
R
A
A
R
R
Y
Y
D
D
S I
S I
T
T
U
U
R
R
B
B
A
A
N
N
C
C
E
E
Doc ID 15028 Rev 4
Operation descriptions
8)
can be calculating by:
OVP
1 k
OVP
×
---------------------- -
k
OVP
0 →1
0 →1
1 → 2
1 → 2
2 →3
2 →3
0
0
F
F
E
E
E
E
D
D
B
B
A
A
C
C
K
K
L
L
O
O
O
O
P
P
F
F
A
A
L I
L I
U
U
R
R
E
E
t
t
t
t
t
t
t
t
t
t
t
3 → 4
3 → 4
t
t
t
t
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