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LF300RU Series
Very Wide Input, 3W SMT Single & Dual Output DC/DC Converters
Electrical Specifications
Specifications typical @ +25C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Input
Key Features:
* 3W Output Power * Wide 4:1 Inputs * Miniature SMT Case * Tight Line/Load Regulation * 1,500 VDC Isolation * -40C to +71C Operation * 14 Standard Models * 1.0 MH MTBF Minimum * Industry Standard Pin-Out
Parameter Input Start Voltage Reverse Polarity Input Current Short Circuit Input Power Input Filter
Conditions 24 VDC Input 48 VDC Input
Max. 8.5 17.0 1.0 2,000 (Pi) Filter (Meets EN55022 Class A) Min. Typ. 0.5 0.5 0.2 0.3 50 Max. 1.0 2.0 1.0 1.0 75 100 15 500 6 0.02
Min. 4.5 8.5
Typ. 6.0 12.0
Units VDC A mW
Output
Parameter Output Voltage Accuracy Output Voltage Balance Line Regulation Load Regulation Ripple & Noise (20 MHz) (Note 1) Ripple & Noise (20 MHz) Ripple & Noise (20 MHz) Output Power Protection Transient Response Time (Note 2) Transient Response Deviation Temperature Coefficient Output Short Circuit Conditions Dual Output, Balanced Load For Vin = Min to Max Iout = 10% to 100% Units % % % % mV P - P mV P - P mV rms % S % %/C
120 25% Load Step Change 150 2 0.01 Continuous (Autorecovery) Min. 1,500 1,000 Typ.
RoHS Compliant
General
Parameter Isolation Voltage Isolation Resistance Isolation Capacitance Switching Frequency Conditions 60 Seconds 1,000 VDC 100 kHz, 1V Max. Units VDC M pF kHz Units
350 300
500
Environmental
Parameter Operating Temperature Range Operating Temperature Range Storage Temperature Range Cooling Humidity Conditions Min. Typ. -40 +25 -40 -40 Free Air Convection RH, Non-condensing Ambient Case Max. +71 +90 +125 95
MicroPower Direct
292 Page Street Suite D Stoughton, MA 02072 USA T: (781) 344-8226 F: (781) 344-8481 E: sales@micropowerdirect.com W: www.micropowerdirect.com
C C C
%
Physical
Case Size Case Material Weight 1.27 x 0.58 x 0.40 Inches (32.3 x 14.8 x 10.2 mm) Non-Conductive Black Plastic (UL94-V0) 0.31 Oz (8.8g) Conditions MIL HDBK 217F, 25C, Gnd Benign Conditions 24 VDC Input 48 VDC Input 1.5 mm From Case For 10 Sec. All Models Min. 1.0 Min. -0.7 -0.7 Typ. Max. Units MHours Units VDC C mW
Reliability Specifications
Parameter MTBF
Absolute Maximum Ratings
Parameter Input Voltage Surge (1 Sec) Lead Temperature Internal Power Dissipation Typ. Max. 50.0 100.0 260 2,500
Caution: Exceeding Absolute Maximum Ratings may damage the module. These are not continuous operating ratings.
Model Selection Guide
Model Number LF301RU LF302RU LF303RU LF304RU LF305RU LF306RU LF307RU LF311RU LF312RU LF313RU LF314RU LF315RU LF316RU LF317RU Input Voltage (VDC) Current (mA) Nominal Range Full-Load No-Load 24 9.0 - 36.0 138 20 24 9.0 - 36.0 158 20 24 9.0 - 36.0 154 20 24 9.0 - 36.0 154 20 24 9.0 - 36.0 160 20 24 9.0 - 36.0 154 20 24 9.0 - 36.0 154 20 48 18.0 - 75.0 68 10 48 18.0 - 75.0 78 10 48 18.0 - 75.0 75 10 48 18.0 - 75.0 75 10 48 18.0 - 75.0 78 10 48 18.0 - 75.0 75 10 48 18.0 - 75.0 75 10 Voltage (VDC) 3.3 5.0 12.0 15.0 5.0 12.0 15.0 3.3 5.0 12.0 15.0 5.0 12.0 15.0 Output Current (mA, Max) 750 600 250 200 300 125 100 750 600 250 200 300 125 100 Reflected Ripple Cur. Current (mA) (mA, Min) 75.0 10 60.0 10 25.0 10 27.0 10 30.0 10 12.5 10 10.0 10 75.0 5 60.0 5 25.0 5 27.0 5 30.0 5 12.5 5 10.0 5 Efficiency (%, Typ) 75 79 81 81 78 81 81 76 80 83 83 80 83 83 Fuse Rating Slow-Blow (mA) 1,000 1,000 1,000 1,000 1,000 1,000 1,000 500 500 500 500 500 500 500
Notes: 1. When measuring output ripple, it is recommended that an external 0.47 F 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 F 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 specifications. 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 <1.0 at 100 kHz) capacitor be mounted close to the converter. For 24V input units a 4.7 F is recommended, and for 48V units a 2.2 F. 6. Maximum capacitive load for single output units is 3,000 F, for dual output models it is 180 F 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.
Derating Curve
Mechanical Dimensions Remote ON/OFF
Parameter Supply On Supply Off Standby Input Current Control Common Condition Units 2.5 to 5.5 or Open Circuit VDC -0.7 to 0.8 VDC 10 mA Referenced to Negative Input (-Vin)
Remote ON/OFF Notes: 1. Maximum sink current at the on/off pin (pin 1) during a logic low is 300 A. 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 A.
Board Layout
Pin Connections
Pin 1 2 3 10 11 12 13 14 15 22 23 24 Single Dual -Vin -Vin -Vin -Vin On/Off On/Off NC Common NC NC NC -Vout +Vout +Vout NC NC -Vout Common NC NC +Vin +Vin +Vin +Vin
Notes: * All dimensions are typical in inches (mm) * Tolerance x.xx = 0.01 (0.25) * Pin 1 is marked by a "dot" or indentation on the unit
NC: No Connection
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

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