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| AN937 Datasheet, PDF (16/29 Pages) STMicroelectronics – The L4971 is a 1.5 A monolithic dc-dc converter | |||
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Power supply, UVLO and voltage reference
Figure 20. Power stage internal circuit
Q3
I1
I2
Q4
I4
I5
Q5
I3
DELAY
AN937
CSS
Vi
Q1
S
CSS
Q2
from PWM LATCH
SRS
L
+
D
C
VO
-
D97IN659
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.
16/29
Doc ID 5655 Rev 15
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