FP6745 datasheet(8/11 Pages) FITIPOWER

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FP6745-1.4-AUG-2013

FP6745

85T

fitipower integrated technology lnc.

Applications Information (Continued)

will be 25

μs. The PWM signal’s duty cycle (D) must

be greater than 6% to set TON greater than 1.5μs.

Period

PWM Signal

TON

Period

Layout Consideration

The proper PCB layout and component placement

are critical for all switching regulators.

The careful

attention should be taken to the high-frequency and

high

current

loops

prevent

electromagnetic

interference (EMI) problems.

Here are some

suggestions to the layout of FP6745 design.

a. The input capacitor should be located as close to

the VIN and GND pin as possible.

b. Minimize the distance of all traces connected to

the SW node.

The external components, COUT,

L1 and D1 should be placed as close to the

device as possible with short and wide route to

obtain optimum efficiency.

c. Keep the noise-sensitive feedback circuitry away

from

the switching node.

Place feedback

resistor as close to FB pin as possible.

d. The ground terminal of COUT must be located as

closed to GND pin as possible.

Place COUT next

to Schottky diode.

In Backlight application, the system

engineers

usually place the COUT close to the LED connector.

The far COUT of the FP6745 may result in variable

VFB.

’s recommended to add one more C

OUT

close to FP6745.

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