ACT4524_16 datasheet(8/16 Pages) ACTIVE-SEMI

Part #	ACT4524

Description	40V/3.5A Buck Converter with Dual Output and Separated Over Current Protection

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Manufacturer	ACTIVE-SEMI [Active-Semi, Inc]

Direct Link	http://www.active-semi.com

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8 / 16 page

ACT4524

Rev 1.1, 22-Feb-16

Innovative PowerTM

- 8 -

www.active-semi.com

APPLICATIONS INFORMATION

Current Sense Resistor

The traces leading to and from the sense resistor

can be significant error sources. With small value

sense resistors, trace resistance shared with the

load

can

cause

significant

errors.

It

is

recommended to connect the sense resistor pads

directly to the CSP and CSN pins using “Kelvin” or

“4-wire” connection techniques as shown below.

PCB Layout Guidance

When laying out the printed circuit board, the

following checklist should be used to ensure proper

operation of the IC.

1) Arrange the power components to reduce the

AC loop size consisting of CIN, VIN pin, SW pin

and the Schottky diode.

2) The high power loss components, e.g. the

controller, Schottky diode, and the inductor

should be placed carefully to make the thermal

spread evenly on the board.

3) Place input decoupling ceramic capacitor CIN as

close to VIN pin as possible. CIN should be

connected to power GND with several vias or

short and wide copper trace.

4) Shottky anode pad and IC exposed pad should

be placed close to ground clips in CLA

applications.

5) Use “Kelvin” or “4-wire” connection techniques

from the sense resistor pads directly to the CSP

and CSN1, CSN2 pins. The CSP ,CSN1, and

CSN2 traces should be in parallel to avoid

interference.

6) Place multiple vias between top and bottom

GND planes for best heat dissipation and noise

immunity.

7) Use short traces connecting HSB-CHSB-SW

loop.

8) SW pad is noise node switching from VIN to

GND. It should be isolated away from the rest

of circuit for good EMI and low noise operation.

PCB Load

Trace

Kevin Sense

Traces

Sense

Resistor

Example PCB Layout

Top Layer

Bottom Layer

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Active-Semi, Inc	ACT4524YH-T	378Kb / 16P	40V/3.5A Buck Converter with Dual Output and Separated Over Current Protection Rev 0, 28-Jul-15

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Manufacturer	Part #	Datasheet	Description
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ACT4524 Datasheet(PDF) 8 Page - Active-Semi, Inc

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