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Summary of Contents for LM20124

Page 1: ...ed by replacing one of the feedback resistors RFB1 or RFB2 The control loop compensation of the LM20124 evaluation board has been designed to provide a stable solution over the entire input and output voltage range with a reasonable transient response The EN pin must be above 1 18V typ on the board to initiate switching If the EN function is not necessary the EN pin should be externally tied to VI...

Page 2: ... 6 mΩ DCR size and saturation current rating 9A ISAT rating 2 4 Output Capacitor The value of the output capacitor in a buck regulator influences the voltage ripple that will be present on the output voltage as well as the large signal output voltage response to a load transient Given the peak to peak inductor current ripple ΔIP P the output voltage ripple can be approximated by the equation 5 The...

Page 3: ...put current expected in the application 2 9 CC2 A second compensation capacitor CC2 can be used in some designs to provide a high frequency pole useful for cancelling a possible zero introduced by the ESR of the output capacitor For the LM20124 evaluation board the CC2 footprint is unpopulated as the low ESR ceramic capacitor used on the output does not contribute a zero to the control loop before...

Page 4: ...Murata 1 L 1 µH 6 mΩ MSS1038 102NL Coilcraft 1 RF 1Ω 0603 CRCW06031R0J e3 Vishay Dale 1 CF 100 nF 0603 X7R 16V GRM188R71C104KA01 Murata 1 CVCC 1 µF 0603 X5R 6 3V GRM188R60J105KA01 Murata 1 RPG 10 kΩ 0603 CRCW06031002F e3 Vishay Dale 1 RC1 3 9 kΩ 0603 CRCW06033901F e3 Vishay Dale 1 CC1 3 3 nF 0603 X7R 25V VJ0603Y332KXXA Vishay Vitramon 1 CC2 OPEN OPEN N A 0 CSS 33nF 0603 X7R 25V VJ0603Y333KXXA Vish...

Page 5: ...he device The operating voltage for this pin should not exceed 5 5V The absolute maximum voltage rating on this pin is 6V SS TRACK This terminal provides access to the SS TRK pin of the device Connections to this terminal are not needed for most applications The feedback pin of the device will track the voltage on the SS TRK pin if it is driven with an external voltage source that is below the 0 8...

Page 6: ...vs Load Line Regulation ILOAD 4A 0 5A to 4A Load Transient Response Load Regulation VIN 5V 200 µs DIV Startup Waveform 2ms DIV 6 AN 1654 LM20124 Evaluation Board SNVA252B October 2007 Revised May 2013 Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 7: ... Layout 7 PCB Layout Figure 2 Top Layer Figure 3 Bottom Layer 7 SNVA252B October 2007 Revised May 2013 AN 1654 LM20124 Evaluation Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Page 8: ...esponsible 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 information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

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