ACE150X

150KHz,2A ,PWM Step-Down DC/DC Converter

VER 1.2

5

Notes:

Thermal Considerations:

The SOP-8 package needs a heat sink under most conditions. The size of the heat sink depends on the input

voltage, the load current and ambient temperature. The ACE150X junction temperature rises above ambient

temperature for a 2A load and different input and output voltages. The data for these curves was taken with the

ACE150X(SOP-8 package) operating as a buck-switching regulator in an ambient temperature of 25℃ (still air).

These temperature increments are all approximate and are affected by many factors.

Higher ambient temperatures require more heat sinker. For the best thermal performance, wide copper traces and

generous amounts of printed circuit board copper should be used in the board layout. ( One exception is the

output(switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of

heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further.

Package thermal resistance and junction temperature increments are affected by a lot of factors. Some of these

factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace

width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of

solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, Furthermore,

some of these components such as the catch diode will add heat to the PC board and the heat can vary as the

input voltage changes. For the inductor, depending on the physical size, type or core material and the DC resistance,

it could either act as a heat sink taking heat away from the board, or it could add heat to the board.

Application Data

3A Diode

3A Diode

Surface Mount

Through Hole

Surface Mount

Through Hole

VR(V)

Scgittky

Schottky

Scgittky

Schottky

20

SK32

1N5820

SR302

MBR320

1N5823

SR502

MBR520

30

SK33

1N5821

MBR330

31DQ03

50WQ03

1N5824

SR503

SB530

40

SK34

MBRS340

1N5822

SR304

MBR340

31DQ04

50WQ04

1N5825

SR504

SB540

50

SK35

MBRS360

SR305

MBR350

31DQ05

MUR320

50WQ05

50WF10

SB550

50SQ080

HER601

MUR620