ISL976787IBZ-T 데이터 시트보기 (PDF) - Renesas Electronics

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ISL976787IBZ-T

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

Renesas Electronics 

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, 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.

PVIN

PGND

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.

PIN 1

INDUCTOR

VOUT

DIODE

PGND

FIGURE 29. EXAMPLE OF TWO LAYER PCB LAYOUT

FN7714 Rev.3.00

Sep 13, 2017

Page 19 of 24

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