Circuit operation

AN2544

10/17

The above board can be modified to any voltage output from 10 V to 15 V by changing DZ.

To modify the board to 16 or higher, D6 and C4 can be omitted and the jumper wire can be

having the current leak through the Zener and Vf pin path. The output voltage can be

changed by changing DZ from 16 V Zener to a higher value matching the output voltage. If

pin compatible with the VIPer22ADIP-E.

Also one of the input capacitors, C2, can be reduced to 4.7 µF. Various data and waveforms

from evaluation boards can be seen in the following pages.

capacitor.

Table 3.

Bill of material for VIPer22A-E Buck 12 V at 350 mA

Item

Qty

Ref.

Part

V/W

Description

CAT#

1

1

Cx

0.022

50 V

X7R +/-10%

GP SM Ceramic

2

2

C1,C2

10 µF

400 V

105 C

UCC

EKMG401ELL100MJ20S

3

1

C3

4.7 µF

25 V

X7R +/-10%

TDK C3216X7R1E475K

4

1

C4

0.47 µF

25 V

X7R +/-10%

TDK C2012X7R1E474K

5

1

C6

47 µF

50 V

105 C Low ESR

Low ESR

6

1

C7

0.1 µ

1 kV

X7R +/-15%

Murata

GRM55DR73A104KW011

7

1

DZ

12 V

zener

BZT5212FDICT

8

1

DZ1

16 V

zener

BZT5216FDICT

9

3

D1,D6,D8

S1MDICT

SM GP Diode 1 kV 1 A

S1MD

10

1

D5

STTH1R06A

600 V 1 A Ultrafast

STMicroelectronics

11

2

J1, J2

2 pin

Mouser 651-1751099

12

1

L0

470 µH

140 mA

JW Miller 5300-33

13

1

L1

1 mH

400 mA

Compostar Q3277 or

JW Miller RL895-102K

14

1

R0

10

Ω

1 W

wire wound

ALSR1J-10

15

1

R1

1 k

Ω

5%

SM 1206 CERAMIC

16

1

U1

VIPer22ADIP-E

STMicroelectronics

Table 4.

Bill of material for VIPer22A-E Buck 16 V at 350 mA

For 16 V or higher operation.

Omit

1

D8

S1MDICT

SM GP Diode

1 kV 1A

S1MD

Omit

1

C4

0.47 µF

25 V

X7R +/-10%

TDK C2012X7R1E474K

Add

1

Jumper

Wire jumper

24 AWG