UM0727

Demonstration board description

Doc ID 15906 Rev 1

7/18

Figure 4.

Resonant transformer: mechanical drawing

The output voltage can be adjusted down to 1.235 V by a voltage divider. An internal

oscillator fixes the switching frequency up to 500 kHz to minimize the size of external

components. The power IC features several layers of protection, such as pulse by pulse

current limit with internal frequency modulation aimed at an effective constant current short

circuit protection, feedback disconnection and thermal shutdown. Finally, it can be

synchronized using a dedicated pin as well as inhibited for reduced standby power

consumption and time sequence operations.

The board layout is shown in Figure 5. The whole power supply is produced on a double

side 35 µm PCB FR-4 (130 x 66 mm).

Figure 5.

STEVAL-ISA018V1 board layout with tracks

AM04390v1