ACT4533C

Rev 1, 14-Nov-14

Innovative Power

TM

- 9 -

www.active-semi.com

Copyright © 2014 Active-Semi, Inc.

STABILITY COMPENSATION CONT’D

compensation

needs

to

be

adjusted

correspondingly. As show in Figure 7, adding a

compensation capacitance at COMP pin helps the

system stability.

Figure 6:

Cable Compensation at Various Resistor

Divider Values

Figure 7:

PC Board Layout Guidance

When laying out the printed circuit board, the

following checklist should be used to ensure proper

1) Arrange the power components to reduce the

and the schottky diode.

power GND with vias or short and wide path.

and connect the signal GND to power GND at a

single point for best noise immunity. Connect

exposed pad to power ground copper area with

copper and vias.

dissipation and noise immunity.

Figure 8 shows an example of PCB layout.

Figure 9 gives one typical car charger application

schematic and associated BOM list.

Figure 8: PCB Layout

400

300

250

200

150

100

50

0

350

450

Output Current (A)

0

0.3

0.6

0.9

1.2

1.5

1.8

2.4

2.1

1

= 3

00

k

1

= 2

40k

= 150

k

= 20

0k

FB

1nF

Comp

Delta Output Voltage vs. Output Current