STMicroelectronics 19V - 90W Adapter with PFC for Laptop computers using the L6563H and L6699 EVL6699-90WADP EVL6699-90WADP Ficha De Dados
Códigos do produto
EVL6699-90WADP
L6699
Current sensing, OCP and OLP
Doc ID 022835 Rev 2
27/38
Figure 20.
Soft-start and delayed shutdown upon overcurrent timing diagram (safe-
start details are not shown)
start details are not shown)
In applications where continuous operation of the converter is needed even under overload
conditions, the delayed shutdown function can be disabled by simply grounding the DELAY
pin.
conditions, the delayed shutdown function can be disabled by simply grounding the DELAY
pin.
If the voltage on the ISEN pin reaches 1.5 V, the second comparator is triggered. Switching
is stopped immediately and both the internal switch that discharges C
is stopped immediately and both the internal switch that discharges C
SS
and the 350 µA
current source on the DELAY pin are forced continuously on. As V(DELAY) equals 3.5 V the
350 µA generator is turned off, so that C
350 µA generator is turned off, so that C
Delay
is slowly discharged by R
Delay
. The L6699
restarts when V(DELAY) falls below 0.3 V.
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