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L6563STR Datasheet(PDF) 32 Page - STMicroelectronics

Part No. L6563STR
Description  Enhanced transition-mode PFC controller
Download  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6563STR Datasheet(HTML) 32 Page - STMicroelectronics

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Application information
L6563S
32/42
Doc ID 16116 Rev 3
Figure 44.
Interface circuits that let the L6563S switch on or off a PWM controller
If the chip is provided with a soft-start pin, it is possible to delay the start-up of the dc-dc
stage with respect to that of the PFC stage, which is often desired, as described in
Figure 45
. An underlying assumption in order for that to work properly is that the UVLO
thresholds of the PWM controller are certainly higher than those of the L6563S.
Figure 45.
Interface circuits for power up sequencing when dc-dc has the SS
function
If this is not the case or it is not possible to achieve a start-up delay long enough (because
this prevents the dc-dc stage from starting up correctly) or, simply, the PWM controller is
devoid of soft start, the arrangement of Figure 46 lets the dc-dc converter start-up when the
voltage generated by the PFC stage reaches a preset value. The technique relies on the
UVLO thresholds of the PWM controller.


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