2

Schematic diagrams

GND1

GND1

GND2

GND2

VISO-

GNDiso

VISO+

GND1

EMI FIlter

f er r i t e bead

0 ohm

ZA9668-AE

TL431

2STR1215

BZT52B4V3

n.m.

10uF

Optional circuitry for improved load regulation

TP5

VIN

R8

620

R3

56k

C20

4.7uF

U2

1

1

2

2

3

3

4

4

7

8

C16

n.m.

TP12

VOUT2

C12

1uF

R17

TP4

GNDpri

C19

4.7uF

TP9

GNDiso

C18

4.7uF

U3

TP7

GND1

L3

4.7uH

C4

4.7p

C15

82p

L4

C21

R12

36k

R1

6.8k

TP8

VISO+

TP10

VISO-

D1

2

1

R13

5k6

C17

TP6

VOUT1

R11

430

U1

A6986I

RST

1

VCC

2

SS/INH

3

SYNCH

4

FSW

5

MLF

6

COMP

7

DELAY

8

FB

9

SGND

10

PGND

11

PGND

12

LX

13

LX

14

VIN

15

VBIAS

16

EP

17

Q1

TP11

GND2

R18

n.m.

C13

1uF

R2

1.3k

C5

680p

D3

C11

10uF

R16

n.m.

8

7

6

6

5

5

Note:

The evaluation board embeds an input EMI filter (on the bottom side). If the filter is not necessary or needs to be bypassed for any test, a 0 Ω

resistor can be placed on R16 (bottom side).