VIPer20/SP/DIP - VIPer20A/ASP/ADIP
OVER-TEMPERATURE PROTECTION:
COMP pin in order to limit the primary peak current
of the device to a value:
Over-temperature protection is based on chip
temperature sensing. The minimum junction
temperature at which over-temperature cut-out
occurs is 140ºC while the typical value is 170ºC.
The device is automatically restarted when the
junction temperature decreases to the restart
temperature threshold that is typically 40ºC below
the shutdown value (see figure 8).
V
– 0.5
COMP
-------------------------------------
I
=
DPEAK
H
ID
where:
R
+ R
1
2
---------------------
V
= 0.6 ×
COMP
R
2
The suggested value for R +R is in the range of
1
2
220KΩ.
Figure 18: Typical Compensation Network
Figure 19: Slope Compensation
VIPer20
R2
R1
VDD
13V
DRAIN
-
VIPer20
OSC
VDD
13V
DRAIN
+
-
COMP SOURCE
OSC
+
COMP SOURCE
C2
R1
C1
C2
Q1
R3
C3
C1
FC00451
FC00461
Figure 20: External Clock Synchronization
Figure 21: Current Limitation Circuit Example
VIPer20
VDD
DRAIN
-
OSC
13V
+
VIPer20
COMP SOURCE
VDD
DRAIN
-
OSC
13V
+
COMP SOURCE
R1
10 kΩ
Q1
R2
FC00470
FC00480
15/25
STMICROELECTRONICS [ ST ]
