FP6121-RWDG datasheet(9/12 Pages) FITIPOWER

9 / 12 page

FP6121-3.5-DEC-2013

FP6121

fitipower integrated technology lnc.

Application Information

The FP6121 include 2 independent output channels.

Current limit and on chip thermal shutdown features

provide protection against

any combination of

overload or ambient temperature that could exceed

maximum junction temperature.

EN Control

Force EN pin high to enable the FP6121 and turned

off the device by pulling it low.

The E pin can’t be

floated and must be tied to the Vin if not used.

The

enable control is independent to each channel.

PSRR (Power Supply Rejection Ratio)

The FP6121 has high 70dB PSRR.

Ripple rejection

is the ability of the regulator to reduce input voltage

ripple.

It is specified with a 10kHz and 1V

P-P

signal

applying to input, with 1

μF output capacitor. Ripple

rejection, expressed in dB, is the ratio of output ripple

to input ripple.

Thermal Shutdown

Thermal shutdown is employed to protect the device

damage from the junction temperature exceed safe

margins due mainly to short circuit or current limit.

Moreover, the device returns normally operation

when the junction temperature down to a constant

temperature.

Though temperature protection circuit

is built in to protect IC, the maximum power

dissipation design within Tj(max) is needed.

The

thermal protection is independent to each channel.

Thermal Consideration

The power handling capability of the device will be

limited by maximum 125

C operation junction

temperature.

The power dissipated by the device

will be estimated by

PD = IOUT  (VIN-VOUT)

The power dissipation should be lower than the

maximum power dissipation listed in “Absolute

Maximum Ratings” section.

Capacitor Selection

The

ceramic

capacitor

ideal

for

FP6121

application.

The ESR of the output capacitor

affects stability.

Larger value of the output

capacitor decreases the peak

deviations and

improves transient response for larger current

changes.

The capacitor types (ceramic, aluminum, and

tantalum) have different characterizations such as

voltage and temperature coefficients.

All ceramic

capacitors are manufactured with a variety of

dielectrics, each with different behavior across

temperature and applications. Common dielectrics

used are X5R, X7R and Y5V.

It is recommended

to use 1

μF to 10μF X5R or X7R dielectric ceramic

capacitors

because

X5R

X7R

hold

their

capacitance over wide voltage and temperature

ranges than other Y5V or Z5U types.

The ESR of

output capacitor is very important because it

generates a zero to provide phase lead for loop

stability.

The input capacitor can reduced peak

current and noise at power source.

FP6121-RWDG Datasheet(PDF) 9 Page - Fitipower Integrated Technology Inc.

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