Model Selection Guide

Mechanical Dimensions

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 1.5 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

 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 4.7

µF.

5. The outputs of these units may be connected to provide a 10 VDC, 24 VDC

or 30 VDC output. To do this, connect the load across the positive (+Vout)

and negative (-Vout) ouputs 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.

Notes:

Pin Connections

Board Layout

Model

Number

Input

Output

Load

Regulation

(%, Max)

Efficiency

(%, Typ)

Output

Capacitive

Load

(µF, Max)

Fuse Rating

Slow-Blow

(mA)

Voltage

(VDC)

Current

(mA, Max)

Current

(mA, Min)

Nominal

Range

Full-Load No-Load

LF201D

5

4.5 - 5.5

519

60

±5.0

±200.0

±4.0

10

77

±10

1,000

LF202D

5

4.5 - 5.5

504

60

±12.0

±83.0

±1.5

7

79

±4.7

1,000

LF203D

5

4.5 - 5.5

501

60

±15.0

±66.0

±1.0

7

79

±4.7

1,000

LF212D

12

10.8 - 13.2

202

30

±12.0

±83.0

±1.5

5

82

±4.7

500

LF213D

12

10.8 - 13.2

201

30

±15.0

±66.0

±1.0

5

82

±4.7

500

LF222D

24

21.6 - 26.4

102

15

±12.0

±83.0

±1.5

5

81

±4.7

200

LF223D

24

21.6 - 26.4

100

15

±15.0

±66.0

±1.0

5

82

±4.7

200

Pin

Description

Pin

Description

1

-Vin

6

No Pin

2

+Vin

7

+Vout

3

No Pin

8

No Pin

4

Common

9

No Pin

5

-Vout

10

NA

NA = Not for electrical connection

Derating Curve

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