L6983 datasheet(24/63 Pages) STMICROELECTRONICS

Nome de Peças	L6983

Descrição Electrónicos	38 V, 3 A synchronous step-down converter with 17 μA quiescent current

PDF	63 Pages

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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24 / 63 page

Figure 21. Over current procedure with persistent short circuit between VOUT and GND

6.9

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. Electrical characteristics). The thermal sensing element is close to the power

elements, assuring 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 is expired, the L6983 restarts with a

new soft-start.

6.10

Power Good

The PGOOD pin indicates whether the output voltage is within its regulation level. The pin output is an open drain

MOSFET. The PG is pulled low when:

The FB pin voltage is lower than 90% (typ.) of the nominal internal reference for more than 10 µs

The FB pin voltage is higher than 120% (typ.) of the nominal internal reference for more than 10 µs (see

Section 6.7 Overvoltage protection)

During the soft-start procedure also with pre-charged VOUT

If a thermal shutdown event occurs

If a UVLO event occurs

The PG pin is VIN compatible.

L6983

Thermal shutdown

DS13116 - Rev 1

page 24/63

L6983 Folha de dados(PDF) 24 Page - STMicroelectronics