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VIPER37HE Datasheet(PDF) 25 Page - STMicroelectronics

Part # VIPER37HE
Description  VIPerPlus family: fixed frequency offline converter
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER37HE Datasheet(HTML) 25 Page - STMicroelectronics

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VIPER37
Operation description
Doc ID 022218 Rev 1
25/35
The resistor values are such that the current sourced and sunk by the CONT pin are within
the rated capability of the internal clamp.
Figure 28.
OVP timing diagram
8.9
About the CONT pin
Referring to
Figure 29, the features below can be implemented through the CONT pin:
1.
Current limit set point
2.
Overvoltage protection on the converter output voltage
Table 11, referring to Figure 29, lists the external resistance combinations needed to
activate one or more of the CONT pin functions.
Figure 29.
CONT pin configuration
t
VDS
VAUX
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
CONT
(pin 4)
sampling time
OVP
FAULT
0
0
0
0 →1
1 →2
2 →0
0 →1
1 →2
2 →3
3 → 4
0
E
R
U
L
I
A
F
P
O
O
L
K
C
A
B
D
E
E
F
E
C
N
A
B
R
U
T
S
I
D
Y
R
A
R
O
P
M
E
T
N
O
I
T
A
R
E
P
O
L
A
M
R
O
N
t
VDS
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
(pin 4)
OVP
FAULT
0
0
0
0 →
1 →
2 →
0 →
1 →
2 →
3 →
0
E
R
U
L
I
A
F
P
O
O
L
K
C
A
B
D
E
E
F
E
C
N
A
B
R
U
T
S
I
D
Y
R
A
R
O
P
M
E
T
N
O
I
T
A
R
E
P
O
L
A
M
R
O
N
t
VOVP
T
STROBE
Current Limit Comparator
To OVP Protection
R
OVP
R
LIM
D
AUX
SOFT
START
CONT
From SenseFET
Auxiliary
winding
To PWM Logic
OVP DETECTION
LOGIC
Curr. Lim.
BLOCK
OCP



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