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VIPER20B Datasheet(PDF) 14 Page - STMicroelectronics

Part No. VIPER20B
Description  SMPS PRIMARY I.C.
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER20B Datasheet(HTML) 14 Page - STMicroelectronics

 
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schematic to be adapted depending the specific
needs. If the proposed schematic is used, the
pulse duration must be kept at a low value (500ns
is sufficient) for minimizing consumption. The
optocoupler must be able to provide 20mA
through the optotransistor.
PRIMARY PEAK CURRENT LIMITATION
The primary IDPEAK current and, as resulting
effect, the output power can be limited using the
simple circuit shown in figure 18. The circuit
based on Q1, R1 and R2 clamps the voltage on
the COMP pin in order to limit the primary peak
current of the device to a value:
IDPEAK
=
VCOMP
− 0.5
HID
where:
VCOMP
= 0.6 x
R1
+ R2
R2
The suggested value for R1+R2 is in the range of
220K
Ω.
OVER-TEMPERATURE PROTECTION:
Over-temperature protection is based on chip
temperature sensing. The minimum junction
temperature at which over-temperature cut-out
occurs is 140
oC while the typical value is 160oC.
The device is automatically restarted when the
junction temperature decreases to the restart
temperature threshold that is typically 34
oC below
the shutdown value (see figure 6).
Figure 16: Slope Compensation
-
+
13V
OSC
COMP
SOURCE
DRAIN
VDD
VIPer
R1
R2
Q1
C2
C1
R3
FC00462
C3
-
+
13V
OSC
COMP
SOURCE
DRAIN
VDD
VIPer
R1
C1
F C00452
C2
Figure 15: Typical Compensation Network
-
+
13V
OSC
COMP SOURCE
DRAIN
VDD
VIPer
10 k
FC00 472
Figure 17:External Clock Synchronization
Figure 18:Current Limitation Circuit Example
-
+
13V
OSC
COMP SOURCE
DRAIN
VDD
VIPer
R1
R2
Q1
FC 00 482
VIPer20B / VIPer20BSP
14/17


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