VIPER50/SP STMICROELECTRONICS [STMicroelectronics], VIPER50/SP Datasheet - Page 15

• Manufacturer Part Number: VIPER50/SP
• Description: SMPS PRIMARY I.C.
• Manufacturer: STMICROELECTRONICS [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 COMP
I DPEAK
=
=
0.6
OSC
V
-------------------------------------
COMP
10 k
13V
VDD
H ID
R 1 R 2
--------------------- -
R 2
+
+
-
–
C2
0.5
VIPer50
COMP SOURCE
OSC
1
FC00351
R1
C1
+R
13V
VDD
2
DRAIN
is in the range of
-
+
VIPer50
FC00370
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
R2
C1
OSC
R1
R3
Q 1
13V
VDD
VIPer50/SP - VIPer50A/ASP
O SC
+
-
R1
R2
13V
VD D
VIPer50
C 2
COMP
+
-
V IP er50
FC00380
COM P
SOURCE
Q1
C3
DRAIN
FC 00361
SO U RCE
DRAIN
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