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DFA20E48S5 Datasheet(PDF) 3 Page - Power-One |
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DFA20E48S5 Datasheet(HTML) 3 Page - Power-One |
3 / 4 page 3 5 +OUT 7 TRIM 10K LOAD USING TRIMPOT 6 -OUT 5 +OUT 7 TRIM TRIM DOWN TRIM UP LOAD USING FIXED RESISTORS 6 -OUT DFA20 SERIES – SINGLE OUTPUT DFA20 SERIES APPLICATION NOTES: External Capacitance Requirements No external capacitance is required for operation of the DFA20 Series. The use of input capacitors with less than 0.5 ESR may cause peaking in the input filter and degrade filter performance. External output capacitance is not required for operation, however it is recommended that 1 F to 10 F of tantalum and 0.001 to 0.1 F ceramic capacitance be selected for reduced system noise. Additional output capacitance may be added for increased filtering, but should not exceed 400 F. Negative Outputs A negative output voltage may be obtained by connecting the +OUT to circuit ground and connecting -OUT as the negative output. Remote ON/OFF Operation The remote ON/OFF pin may be left floating if this function is not used. It is recommended to drive this pin with an open collector arrangement or a relay contact. When the ON/OFF pin is pulled low with respect to the -INPUT, the converter is placed in a low power drain state. Output TRIM The TRIM pin may be used to adjust the output ±5% from the nominal setting. This function allows adjustment for voltage drops in the system wiring, as well 5.2 volt outputs for ECL applications. Figure 1 shows the proper connections to use this function. A trimpot value of 10K should be used for 3.3 and 5 volt outputs. A trimpot value of 20K should be used for 12 and 15 volt outputs. If the TRIM function is not required the pin may be left floating. Figure 1. DFA20 SERIES BLOCK DIAGRAM 5 + OUTPUT ISOLATION TRANSFORMER + 6 7 TRIM ISOLATED FEEDBACK LOW TC BANDGAP REFERENCE FIVE SIDED SHIELDED COPPER CASE + – 2 – INPUT ON/OFF 1 3 + INPUT CURRENT MODE PWM THERMAL SHUTDOWN LC INPUT FILTER - OUT 50 0 5 10 15 20 60 70 80 90 100 OUTPUT POWER DERATING AMBIENT TEMPERATURE NUCLEAR AND MEDICAL APPLICATIONS Power-One products are not authorized for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the President of Power-One, Inc. TECHNICAL REVISIONS The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. |
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