viper20sp STMicroelectronics, viper20sp Datasheet - Page 15

• Manufacturer Part Number: viper20sp
• Description: Smps Primary I.c.
• Manufacturer: STMicroelectronics

Figure 18: Typical Compensation Network
Figure 20: External Clock Synchronization
COMP pin in order to limit the primary peak current
of the device to a value:
where:
The suggested value for R
220K .
V
I
DPEAK
COMP
=
=
0.6
V
-------------------------------------
OSC
COMP
10 k
13V
VDD
H ID
R
--------------------- -
1
R 2
+
+
-
–
C2
R
0.5
VIPer20
2
COMP SOURCE
OSC
1
FC00451
R1
C1
+R
13V
VDD
2
DRAIN
is in the range of
-
+
VIPer20
FC00470
COMP SOURCE
DRAIN
OVER-TEMPERATURE PROTECTION:
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).
Figure 19: Slope Compensation
Figure 21: Current Limitation Circuit Example
VIPer20/SP/DIP - VIPer20A/ASP/ADIP
R2
C1
OSC
R1
R3
Q1
13V
VDD
OSC
+
-
R1
R2
13V
VDD
VIPer20
C2
+
-
COMP
VIPer20
FC00480
COMP SOURCE
C3
SOURCE
Q1
FC00461
DRAIN
DRAIN
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