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AN4092 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN4092
Description  Low to mid range engine management
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4092 Datasheet(HTML) 12 Page - STMicroelectronics

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Power Management Controller (PMC)
AN4092
12/38
Doc ID 023080 Rev 2
Figure 3.
Inrush current example - without collector resistor
Figure 4.
Inrush current example - with collector resistor
1.1.7
Layout recommendations
The inductance of the heatsink rail of the ballast transistor and the MCU lead to inductance
in the system. The placement of the transistor also affects the inductance, due to the lengths
of the 1.2 V traces (from the emitter to the VDD pins) and of the VRCCTL signal: those
inductances eventually reduce the phase margin jeopardizing the regulator stability.
It is mandatory to keep the parasitic inductance between the emitter and VDD pins lower
than 20nH.



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