Application information

AN1441

10/13

Doc ID 8422 Rev 2

protection occurs, can be dissipated with a ground plane, as shown in Figure 12. Figure 12

and 13 display the demonstration board PCB and schematic circuit. It is designed for SMD

components.

2.4

Demonstration board description

Figure 13.

On the left side of the board the power input connector is found, while the output connector

is on the right side. A 3-pin connector, J3, is located on the left side as well. This connector

FAULT pin (pin 8) is connected to J4. It can be closed by using the jumper to reach LED1, or

it can be used to connect the FAULT to an external microprocessor. The SET pin (pin 5) is

The bill of material is:

–

R1 = 2700

–

R2 = 680

Ω 1/4 W

–

R3 = 100 k

Ω 1/4 W

–

C1 = 1 µF

–

C2 = 0.1 µF

–

IC1 = ST890

–

LED1 = 3 mm LED

–

J1-J5 = straight pin headers

2.5

ST890 and USB bus

An example of a ST890 application is the supply of a USB bus, as seen in Figure 14: ST890

USB application.