Derating Curve

Board Layout

Pin Connections

Pin

Single

Dual

1

-Vin

-Vin

2

-Vin

-Vin

3

On/Off

On/Off

10

NC

Common

11

NC

NC

12

NC

-Vout

13

+Vout

+Vout

14

NC

NC

15

-Vout

Common

22

NC

NC

23

+Vin

+Vin

24

+Vin

+Vin

NC: No Connection

Model

Number

Input

Output

Reflected

Ripple Cur.

(mA)

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

LF301RU

24

9.0 - 36.0

138

20

3.3

750

75.0

10

75

1,000

LF302RU

24

9.0 - 36.0

158

20

5.0

600

60.0

10

79

1,000

LF303RU

24

9.0 - 36.0

154

20

12.0

250

25.0

10

81

1,000

LF304RU

24

9.0 - 36.0

154

20

15.0

200

27.0

10

81

1,000

LF305RU

24

9.0 - 36.0

160

20

±5.0

±300

±30.0

10

78

1,000

LF306RU

24

9.0 - 36.0

154

20

±12.0

±125

±12.5

10

81

1,000

LF307RU

24

9.0 - 36.0

154

20

±15.0

±100

±10.0

10

81

1,000

LF311RU

48

18.0 - 75.0

68

10

3.3

750

75.0

5

76

500

LF312RU

48

18.0 - 75.0

78

10

5.0

600

60.0

5

80

500

LF313RU

48

18.0 - 75.0

75

10

12.0

250

25.0

5

83

500

LF314RU

48

18.0 - 75.0

75

10

15.0

200

27.0

5

83

500

LF315RU

48

18.0 - 75.0

78

10

±5.0

±300

±30.0

5

80

500

LF316RU

48

18.0 - 75.0

75

10

±12.0

±125

±12.5

5

83

500

LF317RU

48

18.0 - 75.0

75

10

±15.0

±100

±10.0

5

83

500

MicroPower Direct

www.micropowerdirect.com

292 Page Street Ste D Stoughton, MA 02072

•

TEL: (781) 344-8226

•

FAX: (781) 344-8481

•

E-Mail: sales@micropowerdirect.com

Model Selection Guide

Mechanical Dimensions

Notes:

1. When measuring output ripple, it is recommended that an external 0.47

µF ceramic

capacitor be placed from the +Vout pin to the -Vout pin for single output units and from

each output to common for dual output units. For noise sensitive applications, the use of

3.3

µF capacitors will reduce the output ripple.

2. Transient recovery is measured to within a 1% error band for a load step change of 75%

to 100%.

3. No-load operation will not damage these units, however, they may not meet specifica-

tions.

4. Dual output units may provide a 10V, 24V or 30V output. To do this, connect the load

across the positive (+Vout) and negative (-Vout) outputs and float the output common.

5. 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 <1.0Ω at 100 kHz) capacitor be mounted close to the

converter. For 24V input units a 4.7

µF is recommended, and for 48V units a 2.2 µF.

6. Maximum capacitive load for single output units is 3,000

µF, for dual output models it is

180

µF for each output.

7. 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.

Remote ON/OFF Notes:

1. Maximum sink current at the on/off pin (pin 1) during a logic

low is 300

µA.

2. Maximum allowable leakage current of a switch connected to the

on/off terminal (Pin 1) at logic high (2.5V to 100V) is 200

µA.

Parameter

Condition

Units

Supply On

2.5 to 5.5 or Open Circuit

VDC

Supply Off

-0.7 to 0.8

VDC

Standby Input Current

10

mA

Control Common

Referenced to Negative Input (-Vin)

Remote ON/OFF

Notes:

inches (mm)