LM5166DRCT datasheet(24/57 Pages) TI2

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LM5166

SNVSA67B – DECEMBER 2016 – REVISED JUNE 2017

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In case of an overload event such as an output short circuit, the clamping circuit discharges the soft-start

capacitor. When the short is removed, the FB voltage quickly rises until it reaches the level of the SS pin. Then,

the recovery continues under the soft-start capacitor control. Figure 50 and Figure 51 show short-circuit entry

and recovery waveforms.

Time Scale: 1 ms/Div

CH2: VOUT, 2 V/Div

CH4: IL, 200 mA/Div

Figure 50. Short-Circuit Entry

(Figure 52 Circuit)

Time Scale: 1 ms/Div

CH2: VOUT, 2 V/Div

CH4: IL, 200 mA/Div

Figure 51. Short-Circuit Recovery

(Figure 52 Circuit)

7.3.10 Thermal Shutdown

Thermal shutdown is a built-in self protection to limit junction temperature and prevent damage related to

overheating. Thermal shutdown turns off the device when the junction temperature exceeds 170°C typically to

prevent further power dissipation and temperature rise. Junction temperature decreases during thermal

shutdown, and the LM5166 restarts when the junction temperature falls to 160°C.

LM5166DRCT Datasheet(PDF) 24 Page - Texas Instruments