PM6675AS datasheet(29/48 Pages) STMICROELECTRONICS

部件名	PM6675AS

功能描述	High efficiency step-down controller with embedded 2 A LDO regulator

PDF	48 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

29 / 48 page

PM6675AS

Device description

29/48

7.1.7

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 4 mA.

7.1.8

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 33.

Switching section soft-end

Figure 32.

Soft-start at heavy load (a) and short-circuit (b) condition,

pulse-skip enabled

(a)

(b)

SWEN

VOUT

Resistive Discharge

PM6675AS 数据表(PDF) 29 Page - STMicroelectronics