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AN2798 Datasheet(PDF) 33 Page - STMicroelectronics

Part # AN2798
Description  Complete DDR2/3 memory power supply
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2798 Datasheet(HTML) 33 Page - STMicroelectronics

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AN2798
PM6670AS evaluation tests
33/38
8.12
Thermal behavior
The IC internal maximum and average temperature can be monitored by an IR camera. For
the measurements in Figure 36 through 39 the test setup is:
●
VIN = 24 V
●
FSW = 360 kHz
●
Pulse-skip mode
●
IVDDQ = 4 A
●
VTT rail powered by VDDQ
●
TAMB = 25 °C
By increasing the VTT current, the IC temperature changes as depicted in the following
pictures.
Figure 36.
IVTT = 0 A, average IC temperature = 37.5 °C, max internal IC temperature = 40.1 °C



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