MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK

MP4658 Rev. 1.0

MonolithicPower.com

15

10/13/2021

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PCB Layout Guidelines

Efficient PCB layout is important to achieve

reliable operation, good EMI performance and

excellent thermal performance. For the best

results, refer to Figure 4 and follow the

guidelines below:

1. Minimize the area of the power stage loop.

This

includes

the

primary

loop

(input

capacitor, transformer, and MOSFET sense

resistor), as well as the secondary-side

winding loop (transformer, rectifier, and

output capacitor).

2. Separate the output loop GND and control

circuit GND, and only connect them at the

GND pin.

3. Place the peripheral electronic components

(such as those for VIN, FB, COMP1, and

COMP2) as close to the IC as possible to

decouple noise.

C1

16

FF

15

VIN

14

NC

13

ADIMP

12

ISET

11

LED3

10

LED4

9

GND

1

PDIM

2

OPT

3

FB

4

COMP2

5

COMP1

6

OVP

7

LED1

8

LED2

C4

C5

C2

C3

R2

R3

R4

R1

R5

D1

Figure 4: Recommended PCB Layout