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Texas Instruments LM20133, Руководство пользователя


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Performance Characteristics

4

Performance Characteristics

Efficiency

vs

Load

Line Regulation (I

LOAD

= 3A)

0.5A to 3A Load Transient Response

Load Regulation (V

IN

= 5 V)

(200 µs/DIV)

Startup Waveform

3

SNVA274B – October 2007 – Revised May 2013

AN-1688 LM20133 Evaluation Board

Submit Documentation Feedback

Copyright © 2007–2013, Texas Instruments Incorporated

Содержание LM20133

Страница 1: ...uirements The LM20133 is available in a 16 pin HTSSOP package with an exposed pad for enhanced thermal performance The LM20133 evaluation board has been designed to balance overall solution size with the efficiency of the regulator The evaluation board measures just under 1 3 x 1 1 on a two layer PCB with all components placed on the top layer The power stage and compensation components of the LM2...

Страница 2: ...inal connects to the output voltage of the power supply and should be connected to the load EN This terminal connects to the enable pin of the device This terminal should be connected to VIN or driven externally If driven externally a voltage typically greater than 1 18 V will enable the device The operating voltage for this pin should not exceed 5 5 V The absolute maximum voltage rating on this p...

Страница 3: ...ncy vs Load Line Regulation ILOAD 3A 0 5A to 3A Load Transient Response Load Regulation VIN 5 V 200 µs DIV Startup Waveform 3 SNVA274B October 2007 Revised May 2013 AN 1688 LM20133 Evaluation Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 4: ...tage drop can trigger the UVLO comparator For the demo board a 1 Ω resistor is used for RF ensuring that UVLO will not be triggered after the part is enabled A recommended 1 µF CF capacitor coupled with the 1 Ω resistor provides roughly 16dB of attenuation at the 1 MHz switching frequency 5 3 Inductor As per the device specific data sheet recommendations the inductor value should initially be chos...

Страница 5: ...5 6 CVCC The CVCC capacitor is necessary to bypass an internal 2 7 V subregulator This capacitor should be sized equal to or greater than 1 µF but less than 10 µF A value of 1 µF is sufficient for most applications 5 7 CC1 The capacitor CC1 is used to set the crossover frequency of the LM20133 control loop Since this board was optimized to work well over the full input output voltage and frequency...

Страница 6: ...LM20133 evaluation board is set to 1 2 V giving resistor values of RFB1 4 99 kΩ and RFB2 10 kΩ If a different output voltage is required the value of RFB1 can be adjusted according to Equation 9 9 RFB2 does not need to be changed from its value of 10 kΩ 6 PCB Layout Figure 2 Top Layer 6 AN 1688 LM20133 Evaluation Board SNVA274B October 2007 Revised May 2013 Submit Documentation Feedback Copyright ...

Страница 7: ...www ti com PCB Layout Figure 3 Bottom Layer 7 SNVA274B October 2007 Revised May 2013 AN 1688 LM20133 Evaluation Board Submit Documentation Feedback Copyright 2007 2013 Texas Instruments Incorporated ...

Страница 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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