L6986I datasheet(22/60 Pages) STMICROELECTRONICS

Part #	L6986I

Description	38 V, 5 W synchronous iso-buck converter for isolated applications

PDF	60 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 60 page

The L6986I device implements a 1.9 A typ. negative current limitation to limit the maximum reversed switch

current during the overvoltage operation.

Moreover, the overvoltage protection also activates the internal pull-down on RST pin. Once OVP is deactivated,

the L6986I releases the RST. The release of the RST pin can be delayed by connecting a capacitor to the DELAY

pin (pin 9). For the selection of the capacitance value, equation (28) can be used.

Figure 25. Overvoltage operation

4.11

Thermal shutdown

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

threshold (165 °C typical). 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 continuously. When the thermal protection runs away a new soft-start cycle will take place.

L6986I

Thermal shutdown

DS13647 - Rev 1

page 22/60

L6986I Datasheet(PDF) 22 Page - STMicroelectronics