US 11,749,983 B2
Startup protection circuit, for interrupting startup of a boost DC-DC switching converter
Louis de Marco, Swindon (GB); Nicusor Bortun, Graz (AT); and Giovanni Tarroboiro, Bientina (IT)
Assigned to Dialog Semiconductor (UK) Limited, London (GB)
Filed by Dialog Semiconductor (UK) Limited, London (GB)
Filed on Aug. 3, 2021, as Appl. No. 17/392,689.
Application 17/392,689 is a division of application No. 16/287,287, filed on Feb. 27, 2019, granted, now 11,121,541.
Prior Publication US 2021/0367419 A1, Nov. 25, 2021
Int. Cl. H02H 7/12 (2006.01); H02M 3/155 (2006.01)
CPC H02H 7/1213 (2013.01) [H02M 3/155 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A startup protection circuit, for interrupting startup of a Boost DC-DC switching converter for a short circuit to ground at the output, comprising:
a programmable constant current source, at an input of said Boost DC-DC switching converter,
wherein said programmable constant current source is configured to charge said output of the Boost DC-DC switching converter, during a startup sequence;
a voltage sense comparator, with inputs comprising said output of said Boost DC-DC switching converter and a voltage threshold; and
an isolation switch, between a high side device and said output of said Boost DC-DC switching converter,
wherein said short circuit to ground at said output of said Boost DC-DC switching converter is detected when said programmable constant current source is configured low, a predetermined time for said output to reach said voltage threshold is exceeded, and said output is low,
and when said short circuit to ground is detected, said output of said Boost DC-DC switching converter is pulled up with said programmable constant current before said isolation switch is turned on.