reduced to +3.6V to +5.5V. Other changes to the trans-

former turns ratio may be possible to suit the exact

needs of the application. Refer to the MAX3535E IC

data sheet for more information. Contact HALO

Electronics to obtain a TGM-350NA transformer.

Smaller Transformer and 2kV Isolation Design

The transformer (T1) is an integral part of the dielectric-

withstand voltage of the EV kit circuit. The MAX3535E

(min). However, the circuit uses an isolated transformer

to transfer power from the primary side to the sec-

ondary side. The withstand voltage of the transformer,

as well as the MAX3535E, must be considered when

designing and testing the EV kit circuit. For example, if

less than 3kV isolation is needed, a smaller 2kV trans-

former can be used to save board area, but the entire

circuit will have only 2kV of isolation.

MAX3535E Evaluation Kit

4

_______________________________________________________________________________________

Figure 1. MAX3535E EV Kit Schematic

T1

D1

VCC2

3

2

1

4

5

6

2

1

3

14

16

3

2

VCC2

ST2

ST1

VCC2

C4

0.1µF

C3

10µF

R1

OPEN

A

A

A

Y

R2

OPEN

B

B

A

17

18

R02

SGND

VCC2

VCC2

R02

SLO

15

13

B

Y

1

2

JU3

B

Z

12

Z

1

1

2

2

JU4

JU2

TP2

SGND

TP1

GND

GND2

GND1

411

C1

10µF

C2

0.1µF

1

25

DI

DI

26

27

DE

RE

DE

VCC1

VCC1

VCC1

VCC1

GND

VCC1

R3

100kΩ

R4

100kΩ

JU1

1

2

3

28

RO1

RO1

RE

U1

MAX3535E