LM1575, LM2575-N, LM2575HV

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SNVS106E – MAY 1999 – REVISED APRIL 2013

ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS

LM2575-XX

LM1575-XX

Units

LM2575HV-XX

Symbol

Parameter

Conditions

Typ

(Limits)

DEVICE PARAMETERS

Feedback Bias Current

50

100/500

100/500

nA

Oscillator Frequency

52

kHz

47/43

47/42

kHz(Min)

58/62

58/63

kHz(Max)

Saturation Voltage

(4)

0.9

V

1.2/1.4

1.2/1.4

V(Max)

DC

Max Duty Cycle (ON)

98

%

93

93

%(Min)

Current Limit

2.2

A

1.7/1.3

1.7/1.3

A(Min)

3.0/3.2

3.0/3.2

A(Max)

Output Leakage

Output = 0V

2

2

mA(Max)

Current

Output =

−1V

7.5

mA

Output =

30

30

mA(Max)

Quiescent Current

5

mA

10/12

10

mA(Max)

Standby Quiescent

ON /OFF Pin = 5V (OFF)

50

μA

Current

200/500

200

μA(Max)

Thermal Resistance

65

45

TO-220 Package, Junction to Case

2

85

°C/W

100

DDPAK/TO-263 Package, Junction to Ambient

37

(11)

(1)

All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All limits are used to

calculate Average Outgoing Quality Level, and all are 100% production tested.

(2)

All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits

are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control

(SQC) methods.

(3)

The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated

output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power

dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.

(4)

Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.

(5)

Feedback (pin 4) removed from output and connected to 0V.

(6)

Feedback (pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V

versions, to force the output transistor OFF.

(7)

(8)

Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads in a

socket, or on a PC board with minimum copper area.

(9)

Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads

soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads.

(10) Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper

area will lower thermal resistance further. See thermal model in Switchers made Simple software.

(11) If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally

connected to the package: Using 0.5 square inches of copper area,

and with 1.6 or more square inches of copper area,

Copyright © 1999–2013, Texas Instruments Incorporated

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