L99VR01 datasheet(20/40 Pages) STMICROELECTRONICS

Nome de Peças	L99VR01

Descrição Electrónicos	Automotive low dropout linear voltage regulator with configurable output voltage having 200 mA current capability

PDF	40 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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20 / 40 page

4.7

Overvoltage detection by advanced thermal warning read-out

The TW pin also provides diagnostics about output overvoltage (OV); to distinguish between a thermal warning

event and an output overvoltage event, two different signals are generated at the same TW output pin. How

reported in the previous paragraph a thermal warning event detection sets the TW pin LOW, instead an output

overvoltage event generates a square wave at the TW pin (Figure 35. Square wave on TW pin generated during

an overvoltage). Overvoltage detection has higher priority than thermal warning detection so that concurrence of

thermal warning and over voltage events leads to a square wave like in the case of overvoltage detection (as

shown in Figure 36. Warning signal caused by overvoltage and thermal warning on TW pin).

Figure 35. Square wave on TW pin generated during an overvoltage

Tw_per

A typical example of thermal warning and overvoltage failures management is depicted in Figure 36. Warning

signal caused by overvoltage and thermal warning on TW pin.

Figure 36. Warning signal caused by overvoltage and thermal warning on TW pin

Vo_hth

150ºC

L99VR01

Application information

DS13649 - Rev 4

page 20/40

L99VR01 Folha de dados(PDF) 20 Page - STMicroelectronics