L6981 datasheet(20/49 Pages) STMICROELECTRONICS

Part #	L6981

Description	38 V, 1.5 A synchronous step-down converter with low quiescent current

PDF	49 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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20 / 49 page

Figure 21 shows the L6981 soft-start procedure with VOUT shorted to GND.

Figure 21. Soft-start procedure with VOUT shorted to GND

Figure 22 shows the L6981 over current protection with a persistent short-circuit between VOUT and GND.

Figure 22. Over current procedure with persistent short circuit between VOUT and GND

6.7

Thermal shutdown

The shutdown block disables the switching activity if the junction temperature is higher than a fixed internal

threshold (TSHDWN refer to Table 6). The thermal sensing element is close to the power elements, ensuring fast

and accurate temperature detection. A hysteresis of approximately 30 °C prevents the device from turning ON

and OFF too fast. After a thermal protection event has expired, the L6981 restarts with a new soft-start.

L6981

Thermal shutdown

DS13554 - Rev 1

page 20/49

L6981 Datasheet(PDF) 20 Page - STMicroelectronics