VIPER17LDTR STMicroelectronics, VIPER17LDTR Datasheet - Page 19

• Manufacturer Part Number: VIPER17LDTR
• Description: IC OFFLINE CONV PWM OVP 16SOIC
• Manufacturer: STMicroelectronics
• Series: VIPer™ plusr

Specifications of VIPER17LDTR

• Output Isolation: Isolated
• Frequency Range: 54 ~ 66kHz
• Voltage - Input: 8.5 ~ 23.5 V
• Voltage - Output: 800V
• Power (watts): 12W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width) Exposed Pad
• For Use With: 497-9052 - BOARD EVAL FOR VIPER17LN497-9050 - BOARD DEMO BASED ON VIPER17HN497-9007 - BOARD EVAL BASED ON VIPER17497-8513 - BOARD EVAL VIPER17HN 6W SMPS497-8250 - BOARD EVAL FOR VIPER17497-6447 - BOARD EVAL FOR VIPER17L497-6446 - BOARD EVAL FOR VIPER17H
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-7048-2

VIPER17
Equation 3
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
FAULT
FAULT
V AUX
V
OVP
OVP
OVP
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 14419 Rev 7
T
T
E
E
M
M
P
P
O
O
R
R
R
A
A
OVP
k
R
R
Y
Y
OVP
Table 8 on page
1 →2
1 →2
D
D
S I
S I
T
T
=
U
U
R
R
=
B
B
R
A
A
DLIM
N
N
--------------------------------- -
R
LIM
2 →0
2 →0
C
C
E
E
LIM
, the R
R
×
+
LIM
1 k
---------------------- -
R
–
k
OVP
OVP
0
0
OVP
8)
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