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AN937 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN937
Description  The L4971 is a 1.5 A monolithic dc-dc converter
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN937 Datasheet(HTML) 16 Page - STMicroelectronics

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Power supply, UVLO and voltage reference
AN937
16/29
Doc ID 5655 Rev 15
Figure 20.
Power stage internal circuit
2.9
Turn - off
The turn-off behavior, is shown at Figure 19.
Figure 20 shows the details of the internal power stage and driver, where at Q2 is
demanded the turn-off of the power switch, S.
VO
D97IN659
DELAY
I2
Vi
L
CSS
Q3
I1
Q1
Q2
S
+
-
C
D
Q5
Q4
I5
I4
I3
from PWM LATCH
CSS
SRS



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