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 each output to common. 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 supplied 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. The outputs of these units may be connected to provide a 10 VDC, 18

VDC, 24 VDC or 30 VDC output. To do this, connect the load across

the positive (+Vout) and negative (-Vout) outputs and float the ouput

common.

6. 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.

Pin Connections

μF Max

33

Capacitive Load

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

LF101D

5

4.5 - 5.5

267

30

±5.0

±100.0

±2.0

10

75

500

LF102D

5

4.5 - 5.5

260

30

±9.0

±55.0

±1.0

10

76

500

LF103D

5

4.5 - 5.5

255

30

±12.0

±42.0

±0.8

8

79

500

LF104D

5

4.5 - 5.5

251

30

±15.0

±33.0

±0.7

7

79

500

LF111D

12

10.8 - 13.2

111

15

±5.0

±100.0

±2.0

8

75

200

LF112D

12

10.8 - 13.2

109

15

±9.0

±55.0

±1.0

8

76

200

LF113D

12

10.8 - 13.2

105

15

±12.0

±42.0

±0.8

5

80

200

LF114D

12

10.8 - 13.2

103

15

±15.0

±33.0

±0.7

5

80

200

LF121D

24

21.6 - 26.4

56

9

±5.0

±100.0

±2.0

8

74

100

LF122D

24

21.6 - 26.4

55

9

±9.0

±55.0

±1.0

8

75

100

LF123D

24

21.6 - 26.4

53

9

±12.0

±42.0

±0.8

5

79

100

LF124D

24

21.6 - 26.4

52

9

±15.0

±33.0

±0.7

5

79

100

Pin

Description

Pin

Description

1-Vin

6

NA

2

+Vin

7

+Vout

3NA

8

NA

4

Common

9

NA

5

-Vout

10

NA

MicroPower Direct

www.micropowerdirect.com

Board Layout

Derating Curve