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Performance Characteristics

Conditions: Input Voltage = 78VDC Output Current = 25A

Conditions: Input Voltage = 48VDC Output Current = 5A

Trace 1: Q1 drain voltage Volts/div = 20V Horizontal

Synchronous rectifier, Q3 gate Volts/div = 5V Trace 1:

Resolution = 1µs/div

Synchronous rectifier, Q3 gate Volts/div = 5V Trace 2:
Synchronous rectifier, Q5 gate Volts/div = 5V Horizontal
Resolution = 1µs/div

Figure 7. Drain Voltage of Q1

Figure 8. Gate Voltages

SNVA117A – September 2005 – Revised May 2013

AN-1387 LM5026 Evaluation Board

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Содержание AN-1387 LM5026

Страница 1: ...in primary switch turns on and applies the input voltage across the primary winding which has 12 turns The transformer secondary has 2 turns leading to a 6 1 step down of the input voltage For an outp...

Страница 2: ...ts this is especially true for accurate efficiency measurements 5 Source Power The evaluation board can be viewed as a constant power load At low input line voltage 36V the input current can reach 3 5...

Страница 3: ...impedance referred to earlier The interaction of the source supply folding back and the evaluation board going into undervoltage shutdown will start an oscillation or chatter that may have undesirable...

Страница 4: ...the gate capacitance This provides improved switching transitions for optimum efficiency The difference in drive voltage is inherent in the topology and varies with line voltage Conditions Input Volta...

Страница 5: ...hronous rectifier Q3 gate Volts div 5V Trace 1 Resolution 1 s div Synchronous rectifier Q3 gate Volts div 5V Trace 2 Synchronous rectifier Q5 gate Volts div 5V Horizontal Resolution 1 s div Figure 7 D...

Страница 6: ...pplication Circuit Figure 9 Application Circuit Input 36 to 78V Output 3 3V 30A 6 AN 1387 LM5026 Evaluation Board SNVA117A September 2005 Revised May 2013 Submit Documentation Feedback Copyright 2005...

Страница 7: ...ITOR TANT KEMET 330 6 3V 3 C21 C22 C23 C4532X7S0G686M CAPACITOR CER TDK 68 4V C24 C25 OPEN NOT USED 1 C26 C0805C101J5GAC CAPACITOR CER KEMET 100p 50V 1 C27 C1206C333K5RAC CAPACITOR CER KEMET 0 033 50V...

Страница 8: ...RRENT XFR PULSE ENG 100 01 1 T2 B0357 B POWER XFR COILCRAFT 12 02 1 U1 LM5026 CONTROLLER Texas Instruments 1 U2 MOCD207M OPTO COUPLER QT OPTO 1 U3 LM6132 OPAMP Texas Instruments 1 U4 LM4041 REFERENCE...

Страница 9: ...www ti com PCB Layouts Figure 11 Figure 12 9 SNVA117A September 2005 Revised May 2013 AN 1387 LM5026 Evaluation Board Submit Documentation Feedback Copyright 2005 2013 Texas Instruments Incorporated...

Страница 10: ...PCB Layouts www ti com Figure 13 Figure 14 10 AN 1387 LM5026 Evaluation Board SNVA117A September 2005 Revised May 2013 Submit Documentation Feedback Copyright 2005 2013 Texas Instruments Incorporated...

Страница 11: ...www ti com PCB Layouts Figure 15 11 SNVA117A September 2005 Revised May 2013 AN 1387 LM5026 Evaluation Board Submit Documentation Feedback Copyright 2005 2013 Texas Instruments Incorporated...

Страница 12: ...sponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related inf...