TPS658620ZQZT datasheet(38/104 Pages) TI

номер детали	TPS658620ZQZT

подробное описание детали	Advanced Power Management Unit

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3.22 DETECTING THE SYSTEM STATUS

TPS658620

Advanced Power Management Unit

SLVS993 – OCTOBER 2009

www.ti.com

Figure 3-7. Charge Phases Without Thermal Foldback

Figure 3-8. Charge Phases With Thermal Foldback

The TPS658620 has integrated comparators that monitor the voltages at the BAT, TS, and VIN_CHG

pins, as well as the charge current. The data generated by those comparators is used by the control logic

to detect fault conditions and control SM2 operation. Table 3-6 lists the system power detection

conditions. VSH(VIN_CHG), VLOWBAT, and VSH(BAT) are TPS658620 internal references (refer to the electrical

characteristics for additional details).

Table 3-6. System Status Detection Conditions

STATUS

DETECTION REQUIREMENTS

VIN_CHG pin short detected

V(VIN_CHG) < VSH(VIN_CHG)

Battery voltage below pre-charge threshold

V(BAT) < VLOWBAT

Battery short detected

V(BAT) < VSH(BAT)

DETAILED DESCRIPTION

38

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