2

Schematic diagrams

GND1

GND1

GND2

GND2

GNDiso

VISO+

GND1

EMI FIlter

ferrite bead

0 ohm

ZB1175-AE

TL431

2STR1215

n.m.

10uF

Optional circuitry for improved load

regulation

R8

180

TP5

VIN

R3

56k

VOUT2

TP12

C16

n.m.

C20

4.7uF

C19

4.7uF

TP4

GNDpri

R17

L3

4.7uH

TP7

GND1

U2

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

U3

C18

4.7uF

L4

C15

68p

C4

4.7p

R1

6.8k

R12

11k

C21

TP6

VOUT1

C17

R13

10.7k

D1

2

1

TP9 GNDiso

TP8

VISO+

Q1

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

R11

100

R2

1.3k

C13

1uF

R18

n.m.

TP11

GND2

C5

680p

C11

10uF

R16

n.m.

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).