TLE6389_07 datasheet(35/38 Pages) INFINEON

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TLE 6389

Datasheet Rev. 2.1

2007-08-13

7.11

Components recommendation - overview

7.12

Layout recommendation

The most sensitive points for Buck converters - when considering the layout - are the

nodes at the input, output and the gate of the PMOS transistor and the feedback path.

For proper operation and to avoid stray inductance paths the external catch diode, the

Buck inductance and the input capacitor C

IN1 have to be connected as close as possible to

the PMOS device. Also the GDRV path from the controller to the MosFet has to be as short

as possible. Best suitable for the connection of the cathode of the catch diode and one

terminal of the inductance would be a small plain located next to the drain of the PMOS.

The GND connection of the catch diode must be also as short as possible. In general the

GND level should be implemented as surface area over the whole PCB as second layer,

if necessary as third layer. The feedback path has to be well grounded also, a ceramic

capacitance might help in addition to the output cap to avoid spikes.

To obtain the optimum filter capability of the input pi-filter it has to be located also as

close as possible to the input. To filter the supply input of the device (VS) the ceramic cap

should be connected directly to the pin.

As a guideline an EMC optimized application board / layout is available.

Device

Type

Supplier

Remark

IN1

Electrolytic /Foil type

various

100

µF, 60V

IN2

Ceramic

various

220nF, 60V

B82464-A4473

EPCOS

µH, 1.6A, 145mΩ

B82479-A1473-M

EPCOS

µH, 3.5A, 47mΩ

DO3340P-473

Coilcraft

µH, 3.8A, 110mΩ

DO5022P-683

Coilcraft

µH, 3.5A, 130mΩ

DS5022P-473

Coilcraft

µH, 4.0A, 97mΩ

BSO 613SPV

Infineon

60V, 3.44A, 130m

Ω, NL

BSP 613P

Infineon

60V, 2.9A, 130m

Ω, NL

SPD09P06PL

Infineon

60V, 9A, 250m

Ω, LL

BDS

Ceramic

various

220nF, 16V

MBRD360

Motorola

Schottky, 60V, 3A

MBRD340

Motorola

Schottky, 40V, 3A

SS34

various

Schottky, 40V, 3A

OUT

B45197-A2107

EPCOS

Low ESR Tantalum, 100

µF, 10V

COMP

Ceramic

various

see 7.10.9.

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