12W 5V SMPS evaluation board with ICE3AR4780VJZ

Abstract

Application Note

2

Revision 1.2, 2015-05-12

6

Circuit diagram...........................................................................................................7

7

PCB layout .................................................................................................................8

7.1

Top side......................................................................................................................................................8

7.2

Bottom side................................................................................................................................................8

8

Component list ...........................................................................................................9

9

Transformer construction.......................................................................................... 10

10

Test results .............................................................................................................. 11

10.1

Efficiency ..................................................................................................................................................11

10.2

Standby power ........................................................................................................................................12

10.3

Line regulation.........................................................................................................................................13

10.4

Load regulation .......................................................................................................................................13

10.5

Maximum power......................................................................................................................................14

10.6

ESD immunity (EN61000-4-2).................................................................................................................14

10.7

Surge immunity (EN61000-4-5)..............................................................................................................14

10.8

Conducted emissions (EN55022 class B) ..............................................................................................15

10.9

Thermal measurement...........................................................................................................................17

11

Waveforms and scope plots........................................................................................ 18

11.1

Start up at low/high AC line input voltage with maximum load ........................................................18

11.2

Soft start...................................................................................................................................................18

11.3

Frequency jittering..................................................................................................................................19

11.4

Drain voltage and current at maximum load .......................................................................................19

11.5

Load transient response (Dynamic load from 10% to 100%).............................................................20

11.6

Output ripple voltage at maximum load ..............................................................................................20

11.7

Output ripple voltage during burst mode at 1 W load ........................................................................21

11.8

Active Burst mode operation .................................................................................................................21

11.9

Vcc over voltage protection (Odd skip auto restart mode) ................................................................22

11.10

Over load protection (Auto restart mode)............................................................................................22

11.11

VCC under voltage/Short optocoupler protection (Normal auto restart mode)................................23

11.12

AC Line input OVP mode.........................................................................................................................23

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References ............................................................................................................... 24

Revision History........................................................................................................................ 24