Microsemi

Linfinity Microelectronics Division

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

Page 9

Copyright

© 2000

Rev. 1.1b,2005-03-09

LX1681/1682

Voltage-Mode PWM Controllers

TM

®

BLOCK DI AGRAM

CS Com p

+

-

Am plifier/

Com pensation

+

-

Error Com p

+

-

I

RES ET

R

S

Q

Q

5

V

TRIP

V

CC

7

320k

20k

1

R

SS

V

REF

Hiccup

Ramp

O scillator

4

3

UVLO

8

2

6

L

R

1

ESR

C

OU T

R

2

C

IN

+12V

V

IN

(5V)

+5V

V

CO RE

R

SET

C

SS

V

CC

GND

BDRV

TDRV

V

C1

CS

V

FB

SS/ENABLE

Hiccup

UVLO

I

SE T

PW M

V

RE SE T

I

SET

PHY S IC AL D I M E N S ION S

DM

8-Pin Plastic SOIC

A

P

G

B

K

L

F

C

D

J

M

Note:

1. Dimensions do not include mold flash or protrusions;

these shall not exceed 0.155mm(.006”) on any side. Lead

dimension shall not include solder coverage.

Dim

MIN

MAX

MIN

MAX

A

4.83

5.00

0.190

0.197

B

3.81

3.94

0.150

0.155

C

1.35

1.75

0.053

0.069

D

0.33

0.51

0.013

0.020

F

-

0.77

-

0.030

G

1.27 BSC

0.050 BSC

J

0.19

0.25

0.007

0.010

K

0.13

0.25

0.005

0.010

L

4.80

5.21

0.189

0.205

M

-

8°

-

8°

P

5.79

6.20

0.228

0.244

*LC

-

0.10

-

0.004