Model Selection Guide

Notes:

1. Load regulation is measured for an output change of 20%

to 100%.

2. When measuring output ripple, it is recommended that an

external 0.33 μF ceramic capacitor be placed from the +Vout

pin to the -Vout pin. For noise sensitive applications, the use

of 0.47 μF capacitors will reduce the output ripple.

3. Operation at no-load will not damage these units. However,

they may not meet all specifications.

4. The converter should be connected to a low ac-impedance

source. An input source with a highly inductive impedance

may affect the stability of the converter. In applications where

the converter output loading is high and input power is sup-

plied over long lines, it may be necessary to use a capacitor

on the input to insure start-up.

In this case, it is recommended that a low ESR (ESR <1.0

Ω at

100 kHz) capacitor be mounted close to the converter. For

5V input units a 2.2 μF is recommended, for 12V input units,

a 1.0 μF, and for 24V input units, a 0.47 μF.

5. It is recommended that a fuse be used on the input of a

power supply for protection. See the table above for the

correct rating.

Model

Number

Input

Output

Load

Regulation

(%, Max)

Efficiency

(%, Typ)

Fuse Rating

Slow-Blow

(mA)

Voltage (VDC)

Current (mA)

Voltage

(VDC)

Current

(mA, Max)

Current

(mA, Min)

Nominal

Range

Full-Load

No-Load

LF101S

5

4.5 - 5.5

250

30

5.0

200.0

4.0

10

80

500

LF102S

5

4.5 - 5.5

254

30

9.0

110.0

2.0

10

78

500

LF103S

5

4.5 - 5.5

252

30

12.0

84.0

1.5

8

80

500

LF104S

5

4.5 - 5.5

248

30

15.0

67.0

1.0

7

81

500

LF105S

5

4.5 - 5.5

264

30

3.3

300.0

60.0

10

75

500

LF111S

12

10.8 - 13.2

103

15

5.0

200.0

4.0

8

81

200

LF112S

12

10.8 - 13.2

106

15

9.0

110.0

2.0

8

78

200

LF113S

12

10.8 - 13.2

104

15

12.0

84.0

1.5

5

81

200

LF114S

12

10.8 - 13.2

102

15

15.0

67.0

1.0

5

82

200

LF115S

12

10.8 - 13.2

110

15

3.3

300.0

60.0

8

75

200

LF121S

24

21.6 - 26.4

53

8

5.0

200.0

4.0

8

79

100

LF122S

24

21.6 - 26.4

54

8

9.0

110.0

2.0

8

77

100

LF123S

24

21.6 - 26.4

52

8

12.0

84.0

1.5

5

80

100

LF124S

24

21.6 - 26.4

52

8

15.0

67.0

1.0

5

80

100

LF125S

24

21.6 - 26.4

57

8

3.3

300.0

60.0

8

73

100

Pin

Description

Pin

Description

1

-Vin

5

+Vout

2+Vin

6

NA

3NA

7

NA

4

-Vout

8

NA

Pin Connections

μF Max

33

Capacitive Load

Board Layout

Derating Curve

MicroPower Direct

www.micropowerdirect.com