FP6863 datasheet(8/10 Pages) FITIPOWER

8 / 10 page

FP6863-1.2-FEB-2012

FP6863

85T

fitipower integrated technology lnc.

Application Information

Input Capacitor

A 1

μF or above low-ESR ceramic capacitor for input

capacitor is recommended for general application.

Input capacitor is not necessary for operation, but it is

useful to prevent from affecting upstream circuits such

as noisy supply voltage or output short.

Output short

circuit may cause ringing on the input terminal (from

source lead inductance) to destroy the internal control

circuitry.

The input transient must not exceed 6V of

the absolute maximum supply voltage even for a short

duration.

Output Capacitor

A 0.1

μF or above capacitor between V

OUT and GND is

recommended.

Standard bypass methods should be

used to minimize inductance and resistance between

the bypass capacitor and the downstream connector to

reduce EMI and decouple voltage drop caused when

downstream transients.

Power Dissipation

The device’s junction temperature depends on

several factors such as the load, PCB layout,

ambient temperature and package type.

The

output pin of FP6863 can deliver current up to

1.5A, respectively over the full operating junction

temperature range.

However, the maximum

output current must be decreased at higher

ambient temperature to ensure the junction

temperature does not exceed 125°C.

With all

possible conditions, the junction temperature

must

within

the

range

specified

under

operating conditions.

Power dissipation can be

calculated based on the output current and the

RDS-ON of switch as below:

=R S O

OUT2

Although the devices are rated for 1.5A of output

current, but the application may limit the amount

of output current based on the total power

dissipation and the ambient temperature.

The

final operating junction temperature for any set of

conditions can be estimated by the following

thermal equation:

MA )=

T MA ) TA

θ A

Where TJ(MAX) is the maximum operation junction

temperature, TA is the ambient temperature and

the

is the junction to ambient thermal

resistance.

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