ncv890201 ON Semiconductor, ncv890201 Datasheet - Page 14

• Manufacturer Part Number: ncv890201
• Description: Automotive Buck Switching Regulator
• Manufacturer: ON Semiconductor

the amount of heatsinking on the PCB, the temperature rise
corresponding to this power dissipation can be estimated.
Input capacitor:
current I
an input filter to filter out the ripple current in the source, in
order to reduce EMI conducted emissions.
calculate that an inductor of 200 nH will ensure that the
input filter has a cut−off frequency below 200 kHz (low
enough to attenuate the 2 MHz ripple).
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ORDERING INFORMATION
Specifications Brochure, BRD8011/D.
NCV890201MWTXG
Then, knowing the thermal resistance of the package and
The input capacitor must sustain the RMS input ripple
It can be designed in combination with an inductor to build
For example, using a 4.7 mH input capacitor, it is easy to
INac
:
Device
I
INac
+
DI
2
L
D
3
DFN10 with wettable flanks
(eq. 7)
http://onsemi.com
(Pb−Free)
Package
14
PCB LAYOUT RECOMMENDATION
guidelines to follow to optimize the layout of the printed
circuit board for the NCV890201. However, because of the
high switching frequency extra care has to be taken.
− Minimize the area of the power current loops:
− Minimize the length of high impedance signals, and
As with any switching power supplies, there are some
route them far away from the power loops:
♦
♦
♦
♦
³ output capacitor ³ return through Ground
³ return through ground
Input capacitor ³ NCV890201 switch ³ Inductor
Freewheeling diode ³ inductor ³ Output capacitor
Feedback trace
Comp trace
3000 / Tape & Reel
Shipping
†