FP6167

This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.

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Rev. 0.67

10/14

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

COUT

L

O

C

f

8

1

ESR

I

V

Where f = operating frequency, COUT= output capacitance and ΔIL = ripple current in the

inductor. For a fixed output voltage, the output ripple is highest at maximum input voltage since ΔIL

increases 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

and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can

and output ceramic capacitors, choose the X5R or X7R dielectric formulations. These dielectrics have

the best temperature and voltage characteristics of all the ceramics for a given value and size.

Inductor Value (

Dimensions (mm)

Component Supplier

Model

2.2

8.3×8.3×4.5

FENG-JUI

TPRH8D43-2R2M

2.2

10.3×10.3×4.0

FENG-JUI

TPRH10D40-2R2M

3.3

8.3×8.3×4.5

FENG-JUI

TPRH8D43-3R3M

3.3

10.3×10.3×4.0

FENG-JUI

TPRH10D40-3R3M

4.7

8.3×8.3×4.5

FENG-JUI

TPRH8D43-4R7M

4.7

10.3×10.3×4.0

FENG-JUI

TPRH10D40-4R7M

Capacitor Value

Case Size

Component Supplier

Model

0805

Taiyo Yuden

JMK212BJ106MG

0805

TDK

C12012X5ROJ106K

0805 1206

TDK

C2012JB0J226M