VIPER27HD STMicroelectronics, VIPER27HD Datasheet - Page 19
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VIPER27HD
Manufacturer Part Number
VIPER27HD
Description
IC OFFLINE CONV PWM OVP 16-SOIC
Manufacturer
STMicroelectronics
Series
VIPer™ plusr
Datasheet
1.VIPER27LD.pdf
(31 pages)
Specifications of VIPER27HD
Output Isolation
Isolated
Frequency Range
103 ~ 127kHz
Voltage - Input
8.5 ~ 23.5 V
Voltage - Output
800V
Power (watts)
24W
Operating Temperature
-40°C ~ 150°C
Package / Case
16-SOIC (0.154", 3.90mm Width)
Input Voltage
8.5 V to 23.5 V
Switching Frequency
115 KHz
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
VIPER27HD
Manufacturer:
MPS
Quantity:
10 000
VIPER27
Where:
●
●
●
●
●
●
●
Than, fixed R
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 26. OVP timing diagram
COUNTER
COUNTER
COUNTER
COUNTER
STATUS
STATUS
STROBE
STROBE
RESET
RESET
V CONT
V AUX
FAULT
FAULT
V
V
V
OVP
OVP
OVP
DS
DS
V
V
N
N
V
V
R
OVP
OUT OVP
DSEC
DAUX
AUX
SEC
OVP
0
0
0
0
is the OVP threshold (see
N
N
is the auxiliary winding turns
is the secondary winding turns
together R
O
O
is the auxiliary diode forward voltage
is the secondary diode forward voltage
R
R
M
M
LIM,
A
A
2 µs
2 µs
L
L
is the converter output voltage value to activate the OVP set by designer
O
O
0
0
P
P
E
E
according to the desired I
R
R
A
A
T
T
O I
O I
N
N
LIM
0.5 µs
0.5 µs
0
0
make the output voltage divider
0 →1
0 →1
Doc ID 15133 Rev 5
T
T
E
E
M
M
P
P
O
O
R
R
R
A
A
OVP
R
R
Y
Y
Table 8 on page 7
1 →2
1 →2
D
D
S I
S I
T
T
U
U
=
R
R
B
B
R
A
A
Dlim
N
N
LIM
C
C
2 →0
2 →0
E
E
, the R
×
1 k
---------------------- -
–
k
OVP
0
0
OVP
OVP
)
can be calculating by:
0 →1
0 →1
F
F
E
E
E
E
D
D
B
B
A
A
1 → 2
1 → 2
C
C
Operation descriptions
K
K
L
L
O
O
O
O
P
P
F
F
A
A
L I
L I
2 →3
2 →3
U
U
R
R
E
E
3 → 4
3 → 4
19/31
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t