General circuit description

AN1246

4/8

Figure 2.

PC board top legend bottom foil and surface mount components

Table 1.

Electrical specification from measured results

Parameter

Results

Input voltage range J1

Output J2

12 V from 0 to 0.5 A

Load regulation (0 to 0.5 A) from setpoint

+/-25 mV or +/-0.2%

Line regulation (at max load)

+/-1 mV

Efficiency

Output ripple voltage

35 mV MAX

Input power at no load

0.65 W MAX

Transient response, 50% load step

+/-60 mV typical

Table 2.

Component list

Quantity

Reference

Description

Value

1

C2

F4.7 µF 400 V

1

C3

120 µF 16 V (low ESR)

1

CS4

3.9 nF 50 V

1

CS5

33 nF 50 V

1

CS6

47 µF 25 V

1

C7

680 µF 16 V (low ESR)

1

C8

330 µF 16 V (low ESR)

1

C9

Y1 Rated safety cap

2.2 nF

1

C10

220 pF 1 KV

1

CS11

47 µF 50 V

1

C12

220 pF 1 KV

1

D1

600 V 1 A Ultrafast