Datasheet

Table Of Contents
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
Tabl e 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
V
DS
VA
U
X
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
ERULIAF POOL KCABDEEFECNABRUTSID YRAROPMETNOITAREPO LAMRON
t
V
DS
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
ERULIAF POOL KCABDEEFECNABRUTSID YRAROPMETNOITAREPO LAMRON
t
V
OVP
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