TLE8386-2EL Datasheet, PDF (29/32 Pages) Infineon Technologies AG – Basic Smart Boost Controller

TLE8386-2EL
Application Information
Conducted disturbances:
Conducted disturbances are voltage spikes or voltage oscillations, occurring permanently or by occasion mostly
on the input or output connections. Comparable to the radiated electric fields they are caused by voltage
oscillations occurring due to stray inductances and stray capacitances at the connection between power MOSFET,
output diode D_BOOST and output capacitor C_OUT.
Their frequencies might be between 10 and 100 MHz. They are super positioned to the input and output voltage
and might thus disturb other components of the application.
The countermeasures against conducted disturbances are similar to the radiated electric fields:
• it is recommended to use short an thick connections between the single parts of the converter
• all parts shall be mounted close together
• additional Filter capacitors (ceramic, with low ESR) in parallel to the output and input capacitor and as close
as possible to the switching parts. Input and load current must be forced to pass these devices, do not connect
them via thin lines. Recommended values from 10nF to 220nF
• for the input filter a so called “p” – Filter for maximum suppression might be necessary, which requires
additional capacitors on the input
10.2.2 Additional information
• Please contact us for information regarding the Pin FMEA.
• and for existing application notes with more detailed information about the possibilities of this device
• For further information you may contact http://www.infineon.com/
Data Sheet
27
Rev. 1.0, 2010-10-25