PM6675S Datasheet, PDF (33/53 Pages) STMicroelectronics – High efficiency step-down controller with embedded 2 A LDO regulator

PM6675S
Device description
Figure 42. Soft-start at heavy load (a) and short-circuit (b) conditions, Pulse-Skip enabled
7.1.7
7.1.8
(a)
(b)
Switching section power good signal
The SPG pin is an open drain output used to monitor output voltage through VSNS (in fixed
output voltage mode) or VSEL (in adjustable output voltage mode) pins and is enabled after
the soft-start timer has expired. The SPG signal is held low if the output voltage drops 10%
below or rises 10 % above the nominal regulated value. The SPG output can sink current up
to 4 mA.
Switching section output discharge
Active soft-end of the output occurs when the SWEN (SWitching ENable) is forced low.
When the switching section is turned off, an internal 25 Ω resistor discharges the output
through the VSNS pin.
Figure 43. Switching section soft-end
VOUT
Resistive Discharge
SWEN
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