Test board: design and evaluation

AN4007

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Doc ID 022455 Rev 2

1

Test board: design and evaluation

Table 1 summarizes the electrical specifications of the power supply, Table 2 provides the

bom list and

Table 3 lists the transformer characteristics. The electrical schematic is shown

in

Figure 1 and the PCB layout in Figure 4.

Table 1.

VIPER37LE power supply: electrical specifications

Parameter

Min.

Typ.

Max.

AC main input voltage

50 Hz

60 Hz

Output voltage

4.75 V

5 V

5.25 V

Output current

3 A

Output ripple voltage

50 mV

Rated output power

15 W

Input power in standby

30 mW

Active mode efficiency

70%

Ambient operating temperature

60 °C

Table 2.

VIPER37LE demonstration board: bom list

Reference

Part

Description

Note

R1

2.2 M

Ω

1% tolerance

R2

3.9 M

Ω

1% tolerance

R3

2 M

Ω

1% tolerance

R4

150 k

Ω

1% tolerance

R5

3.3

Ω

R6

330

Ω

R7

220

Ω

R8

12 k

Ω

R9

120 k

Ω

1% tolerance

R10

10 k

Ω

R11

33 k

Ω

1% tolerance

R12

33 k

Ω

1% tolerance

R13

47 k

Ω

R14

39 k

Ω

1% tolerance

C1

220 pF - 630 V film capacitor

C2

33 µF - 400 V electrolytic

C3, C4

ZLK series

1200 µF - 16 V electrolytic

Rubycon