3

Package Pin Description

PACKAGE PIN #

PIN SYMBOL

FUNCTION

Typical Performance Characteristics

1.274

1.264

1.254

1.244

1.234

1.224

1.214

-50

-25

-0

25

50

75

100

125

150

Temperature (

°C)

Reference Voltage vs. Temperature

47

45

43

41

39

37

33

-50

-25

-0

25

50

75

100

125

150

Temperature (

°C)

35

Switching Frequency vs. Temperature

100

90

80

70

60

50

0

0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Switch Current (A)

10

40

30

20

1.8

2.0

Driver Current vs. Switch Current

97

96

95

93

92

91

90

-50

-25

-0

25

50

75

100

125

150

Junction Temperature (

°C)

Maximum Duty Cycle

1.6

1.4

1.2

1.0

0.8

0.6

0

0

0.50

1.00

1.25

1.75

Switch Current (A)

0.4

0.2

2.0

0.25

0.75

1.50

Switch Saturation Voltage

16L

5L

8L

SO Wide

TO-220

PDIP

16

3

1

Gnd

Logic and power ground on TO-220. Logic ground only on 8L

PDIP.

21

2

Control voltage can be used for frequency compensation, cur-

rent limit threshold, frequency synchronization, and soft start.

32

3

Feedback voltage is the negative input to the error amplifier.

1,4,5,6,7,8,

4

NC

No connection.

10,12,15

95

5

Supply input voltage with a range of 3V to 60V.

11

6

Emitter One is a power ground which should always be con-

nected to logic ground since it is used as the negative input to

the current sense amp.

13

4

7

Collector of internal 75V NPN power switch.

14

8

Emitter Two is a power ground which can be left disconnected

to reduce the switch rating to 625mA.