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LM2596-12

Simple switcher Power Converter 150kHz 3A Step-Down Voltage Regulator

First Components International 

LM2596 Simple switcher Power Converter 150kHz

3A Step-Down Voltage Regulator

shown in the Figure 1 test circuit, system performance will be as shown in system parameters section

of Electrical Characteristics.

Note 6: The switching frequency is reduced when the second stage current limit is activated. The amount

of reduction is determined by the severity of current over-load.

Note 7: No diode, inductor or capacitor connected to output pin.

Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.

Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version,

and 15V for the 12V version, to force the output transistor switch OFF.

Note 10: VIN = 40V.

Note 11: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted

vertically, with the leads soldered to a printed circuit board with (1 oz.) copper area of approximately 1 in2

Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single

printed circuit board with 0.5 in2 of (1 oz.) copper area.

Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided

printed circuit board with 2.5 in2 of (1 oz.) copper area.

Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided

printed circuit board with 3 in2 of (1 oz.) copper area on the LM2596S side of the board, and

approximately 16 in2 of copper on the other side of the p-c board.

TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1)

Normalized Output Voltage

1.5

1.0

0.5

0

-0.5

-1.0

-50 -25 0 25 50 75

Switch Saturation

Voltage

1.4

1.3

VIN=12V

1.2

1.1

TJ=-400C

1.0

0.9

0.8

0.7 250C

0.6

1250C

0

1

2

3

4

SWITCH CURRENT (A)

Line Regulation

0.4

0.3

0.2

0.1

0

-0.1

-0.2

-0.3

-0.4

0

5 10 15 20 25 30 35 40

INPUT VOLTAGE (V)

Switch Current Limit

5.5

VIN=12V

VOUT=5V

5.0

4.5

4.0

3.5

-50 -25 0 25 50 75

Efficiency

95

20V

90

12V

85

80

5V

75

70 3.3V

65

0

5 10 15 20 25 30 35 40

INPUT VOLTAGE (V)

Dropout Voltage

1.6

1.4

1.2

ILOAD=3A

1.0

0.8

ILOAD=1A

0.6

-50 -25 0 25 50 75

4

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