Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 7

Copyright

© 2004

Rev 1.0, 3/18/2005

LX1673

High Frequency PWM Regulator

TM

®

APPLI CATI ON SCHEMATI C

LX1673

LDGD

LDFB

LDDIS

DGND

AGND

LDVCC PWGD VC1 TDRV PGND

BDRV

VCCL

VCC

VS

CS

EAO

EA-

EA+

SS

DIS

1

2

3

4

5

6

789

10

11

12

13

14

15

16

17

18

19

20

+12

+5

+5

+5

+3.3

+5

PWM

Vout

LDO

Vout

LDDIS

DIS

PWRGD

Figure 3

– Schematic with Bootstrap Supply for PWM High Side Drive

LX1673

LDGD

LDFB

LDDIS

DGND

AGND

LDVCC PWGD VC1 TDRV PGND

BDRV

VCCL

VCC

VS

CS

EAO

EA-

EA+

SS

DIS

1

2

3

4

5

67

8

9

10

11

12

13

14

15

16

17

18

19

20

+5

+5

+5

+5

PWM

Vout

LDO

Vout

LDDIS

DIS

PWRGD

PWM

Vout

Figure 4

– Schematic for 5 Volt only Input