ISL976787IBZ 查看數據表（PDF） - Intersil

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ISL976787IBZ

4-Channel LED Driver with Phase Shift Control and 10-Bit Dimming Resolution

Intersil 

ISL97687

4. The relatively quiet AGND area, to the right of the neck needs

to be traced out carefully in unbroken metal, via the shortest

possible path to the ground side of the components

connected to OVP, COMP, ISET, ACTL, PWM_SET/PLL, and

ACTL. This is also true for the filtering caps on PWMI and STV.

These are needed to reject noise and cause decoding errors

in some conditions.

5. The current sensing line is shielded by a metal trace, coming

from its source, to prevent pickup from the GD pin beside it.

6. The filtering cap of the current sensing line should be placed

close to the CS pin rather than in the area of current sense

resistor, as it needs to couple this pin to the adjacent PGND pin.

7. The noisy switching FET should be kept far away from the

quiet pin area.

8. The area on the switching node should be determined by the

dissipation requirements of the boost power FET.

PVIN

PGND

INDUCTOR

VOUT

DIODE

PGND

FIGURE 29. EXAMPLE OF TWO LAYER PCB LAYOUT

19

FN7714.0

September 15, 2011

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