Texas Instruments AN-1601 LM34917A User Manual Download Page 10 | Manualshive

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Texas Instruments AN-1601 LM34917A User Manual Download Page 10

PC Board Layout

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PC Board Layout

Figure 13. Board Silkscreen

Figure 14. Board Top Layer

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AN-1601 LM34917A Evaluation Board

SNOA484D – June 2007 – Revised April 2013

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Copyright © 2007–2013, Texas Instruments Incorporated

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Summary of Contents for AN-1601 LM34917A

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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