L6932(2003) 데이터 시트보기 (PDF) - STMicroelectronics

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L6932
(Rev.:2003)

HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR

STMicroelectronics 

L6932

Figure 10. Thermal Impedance

Considering a pulse duration of 1sec, the thermal impedance is close to 20°C/W, allowing much bigger power

dissipated.

Example:

Vin = 3.3V

Vout = 1.8V

Iout = 2A

Pulse Duration = 1sec

The power dissipated by the device is:

PDISS = (VIN - VOUT) · IOUT = 1.5 · 2 3W

Considering a thermal impedance of 20°C/W, the maximum junction temperature will be:

TJ = TA + ZTHJA · PDISS = 60 + 60 = 120°C

Obviously, with pulse durations longer than approximately 10sec the thermal impedance is very close to the

thermal resistance (60°C/W to 70°C/W).

8/10

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