PM6675 datasheet(27/47 Pages) STMICROELECTRONICS

Part #	PM6675

Description	Very fast load transient response using constant on-time control loop

PDF	47 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6.1.7

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 4mA.

6.1.8

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 15. Switching section Soft-End

Figure 14. Soft-start at heavy load (a) and short-circuit (b) conditions, Pulse-Skip enabled

(a)

(b)

SWEN

VOUT

Resistive Discharge

PM6675 Datasheet(PDF) 27 Page - STMicroelectronics