Texas Instruments AN-1601 LM34917A Скачать руководство пользователя страница 7

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Circuit Performance

Circuit Performance

Figure 5. Efficiency vs Load Current

Figure 6. Efficiency vs Input Voltage

Figure 7. Output Voltage Ripple

Figure 8. Switching Frequency vs. Input Voltage

Figure 9. Current Limit vs Input Voltage

SNOA484D – June 2007 – Revised April 2013

AN-1601 LM34917A Evaluation Board

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Содержание AN-1601 LM34917A

Страница 1: ...ers load currents to 1A with current limit set at 1 3A The board s specification are Input Voltage 8V to 33V Output Voltage 5V Maximum load current 1 0A Minimum load current 0A Current Limit 1 3A Meas...

Страница 2: ...necessary The LM34917A and diode D1 may be hot to the touch when operating at high input voltage and high load current Use CAUTION when probing the circuit at high input voltages to prevent injury as...

Страница 3: ...values for R5 and C10 are chosen to generate a 100 mVp p triangle waveform at their junction That triangle wave is then coupled to the FB pin through C9 The following procedure is used to calculate va...

Страница 4: ...and C10 are removed R4 and Cff are added as shown in Figure 3 R4 is chosen to generate 25 30 mVp p at VOUT knowing that the minimum ripple current is 105 mAp p at minimum VIN Cff couples that ripple t...

Страница 5: ...nductor Current The inductor s current can be monitored or viewed on a scope with a current probe Remove R6 and install an appropriate current loop across the two large pads where R6 was located In th...

Страница 6: ...0 F 16V C9 Ceramic Capacitor TDK C1608X7R1H104K 0603 0 1 F 50V C10 Ceramic Capacitor TDK C1608X7R1H332K 0603 3300 pF D1 Schottky Diode Zetex ZLLS2000 SOT23 6 40V 2 2A L1 Power Inductor Bussman DR73 15...

Страница 7: ...Efficiency vs Input Voltage Figure 7 Output Voltage Ripple Figure 8 Switching Frequency vs Input Voltage Figure 9 Current Limit vs Input Voltage 7 SNOA484D June 2007 Revised April 2013 AN 1601 LM34917...

Страница 8: ...aveforms Figure 10 Continuous Conduction Mode Figure 11 Discontinuous Conduction Mode 8 AN 1601 LM34917A Evaluation Board SNOA484D June 2007 Revised April 2013 Submit Documentation Feedback Copyright...

Страница 9: ...com Typical Waveforms Figure 12 Startup Waveforms 9 SNOA484D June 2007 Revised April 2013 AN 1601 LM34917A Evaluation Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorpo...

Страница 10: ...12 PC Board Layout Figure 13 Board Silkscreen Figure 14 Board Top Layer 10 AN 1601 LM34917A Evaluation Board SNOA484D June 2007 Revised April 2013 Submit Documentation Feedback Copyright 2007 2013 Tex...

Страница 11: ...Board Second Layer Viewed from Top Figure 16 Board Third Layer Viewed from Top 11 SNOA484D June 2007 Revised April 2013 AN 1601 LM34917A Evaluation Board Submit Documentation Feedback Copyright 2007...

Страница 12: ...t www ti com Figure 17 Board Bottom Layer Viewed from Top 12 AN 1601 LM34917A Evaluation Board SNOA484D June 2007 Revised April 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments...

Страница 13: ...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...