FP6115

This datasheet contains new product information.

Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Rev. 0.65

11/14

The inductors in different shape and style are available from manufacturers. Shielded inductors

are small and radiate less EMI issue. But they cost more than unshielded inductors. The choice

depends on EMI requirement, price and size

.

Output Capacitor Selection

The output capacitor is required to maintain the DC output voltage. Low ESR capacitors are

preferred to keep the output voltage ripple low. In a buck converter circuit, output ripple voltage is

determined by inductor value, switching frequency, output capacitor value and ESR. The output ripple

is determined by:



























OUT

C

L

O

C

f

8

1

ESR

I

V

OUT

For a fixed output voltage, the output ripple is highest at maximum input voltage since ΔI

with input voltage.

Using Ceramic Input and Output Capacitors

Care must be taken when ceramic capacitors are used at the input and the output. When a

ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a

the output and be mistaken as loop instability. In worst condition, a sudden inrush of current through

part. When choosing the input and output ceramic capacitors, choose the one with X5R or X7R

dielectric formulations. These dielectrics have the best temperature and voltage characteristics of all

the ceramics for a given value and size.

Dimensions(mm)

Component Supplier

Model

10

10.3×10.3×4.0

FENG-JUI

TPRH10D40-10R

10

10.1×10.1×3.0

Sumida

CDRH104R

15

10.3×10.3×4.0

FENG-JUI

TPRH10D40-15R