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SS6578

TYPICAL APPLICATION CIRCUIT

VIN

1

DUTY

2

SHDN

3

FB

4

GND

5

DRI

6

CS-

7

CS+

8

U1 SS6578

R3

12K

R4

3K9

C2

0.1

µF

Rs

*

+

C4

470

µF

D1

GS SS32

+

C1

100

µF

<15V

L1

33

µH

R6

1M

Q1

R7

**

L

f

V

2

)

V

V

(

V

I

I

S

IN

O

IN

O

MAX

,

O

P

×

×

−

+

=

2

O

O

IN

MAX

,

O

S

IN

S

IN

P

P

TH

S

V

V

V

LI

f

V

2

L

f

V

1

.

0

I

mV

50

I

V

R

−

+

=

=

=

L= Inductor value

≤15V, R7=0Ω

DC/DC Buck Converter

ABSOLUTE MAXIMUM RATINGS

VIN Supply Voltage.....…………................................…….............................................. 20V

DUTY Voltage.........................................……………...……........................................... 20V

SHDN Voltage......................................………….......……............................................. 15V

Operating Temperature Range................………….....…….................................... 0

°C~70°C

Storage Temperature Range......................…………....……........................... -65

°C~ 150°C

TEST CIRCUIT

Refer to TYPICAL APPLICATION CIRCUIT.

Rev.2.02 4/06/2004