www.pulseeng.com

64

SPM2006 (

2/08)

SMT POWER INDUCTORS

Flat Coils - PG0277NL Series

Notes from Tables

1. The temperature of the component (ambient plus temperature

rise) must be within the specified operating temperature range.

2. Inductance at Irated is a typical inductance value for the compo-

nent taken at rated current.

3. The rated current listed is the lower of the saturation current @

25°C or the heating current.

nent inductance drops by 20% (typical) at an ambient tempera-

ture of 25°C. This current is determined by placing the compo-

nent in the specified ambient environment and applying a short

duration pulse current (to eliminate self-heating effects) to the

component.

component temperature by approximately 40°C. The heating cur-

rent is determined by mounting the component on a typical PCB

and applying current for 30 minutes. The temperature is mea-

sured by placing the thermocouple on top of the unit under test.

Take note that the component’s performance varies depending

on the system condition. It is suggested that the component be

tested at the system level, to verify the temperature rise of the

component during system operation.

6. Core loss approximation is based on published core data:

Where: Core Loss = in Watts

K1= 3.50E-10

f = switching frequency in kHz

K1 & K2 = core loss factors

ΔΔI = delta I across the component in Ampere

K2

ΔΔI = one half of the peak to peak flux density

across the component in Gauss

7.

Unless otherwise specified, all testing is made at

8.

Optional Tape & Reel packaging can be ordered by adding a "T"

suffix to the part number (i.e. PG0277.401NL becomes

PG0277.401NLT). Pulse complies to industry standard tape and

reel specification EIA481.

Inductance vs Current Characteristics

PG0277.202NL

PG0277.401NL

PG0277.282NL

0.0

0.5

1.0

1.5

2.0

2.5

3.0

DC BIAS (A)

PG0277.142NL

PG0277.801NL

Typical Core Loss vx Peak Flux Density

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

200

400

600

700

900

1000

DB (Gauss) where DB = K2DI

1.0

MHz

100

kHz

500

kHz

400

kHz

300

kHz

200

kHz

2.00

300

500

800

100