LM/-Q1 does not rely on output capacitor ESR An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in. LM Synchronous 1MHz A Step-Down Voltage Regulator from the PowerWise® Family The LM Synchronously Rectified Buck Converter features all. The LM Synchronously Rectified Buck Converter Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Author: Akinom JoJor
Country: Cambodia
Language: English (Spanish)
Genre: Politics
Published (Last): 6 June 2011
Pages: 71
PDF File Size: 4.74 Mb
ePub File Size: 19.28 Mb
ISBN: 613-4-37244-494-1
Downloads: 67725
Price: Free* [*Free Regsitration Required]
Uploader: Taugal

In this demonstration board, a 10 nF capacitor is used. Buyers are responsible for their products and applications using TI components.

A load which creates significant transients requires a larger output capacitor than a fixed load. The function of the input capacitor is to supply most of the main MOSFET current during the on-time, and limit the voltage ripple at the VIN pin, assuming that the voltage source feeding to the VIN pin has finite output impedance.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. Calculate the feedback resistors The ratio of the feedback resistors can be calculated from the following equation: Nonetheless, such components are subject to these terms.

LMQ1 from Texas Instruments

The inductor L1 datashest be connected close to the SW pin with as short a trace as possible to reduce the potential for EMI electromagnetic interference generation. The Constant On-Time COT regulation scheme requires no loop compensation, results in a fast load transient response and simple circuit implementation that allows a low component count, and consequently very small overall board space is required for a typical application.

Buyer will fully indemnify Dtaasheet and its representatives against any damages arising out of the use of any TI components in safety-critical applications. Buyer acknowledges and agrees that any military or aerospace use of TI components which have not been so designated is solely at the Buyer’s risk, and that Buyer is solely responsible for compliance with all legal and regulatory requirements in connection with such use.


TI is not responsible or liable for such altered documentation. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which TI components or services are used. I wish to measure a very low resistance of the order of an ohm. Judicious positioning of the PC board within the end product, along with the use of any available air flow forced or natural convection can help reduce the junction temperature.

It must be as neat and compact as possible, and datashwet external components must be as close to their associated pins of the LM as possible. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. A low ESR 0. The bootstrap capacitor C4 should be connected as close to the SW and BST pins as possible, and the connecting traces should be thick.

Synchronous 1MHz 2.5A Step-Down Voltage Regulator

The input capacitor is calculated from: The time is determined from the following equation: The operating frequency remains constant with line variations dtaasheet to the inverse relationship between the input voltage and the on-time.

C8 should be no smaller than nF for stability, and should be a good quality, low ESR, ceramic capacitor. Lab 6 in this note. For a worst case calculation, the input capacitor must be capable of supplying this average load current during the maximum on-time.

Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed.

Lm3012 Flashcards Grammar checker. Information published by TI regarding third-party products or services dagasheet not constitute a license to use such products or services or a warranty or endorsement thereof.

Information of third parties may be subject to additional restrictions. Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory datashete 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.


AN-1646 LM3102 Demonstration Board

It then drops to zero at turn-off. Using numerous vias to connect the die attached pad to the ground plane is a good practice. The demonstration board schematic, PCB layout, Bill of Materials, and circuit design descriptions are shown. Resale of TI components or services with statements different from or beyond the parameters stated by TI for that component or service voids all express and any implied warranties for the associated TI component or service and is an unfair and deceptive business practice.

This user’s guide details the design of a demonstration board which provides a 3. Vias should be added to connect the ground of the lm3120 capacitors to a ground plane, located as close to the capacitor as possible. Layout is therefore critical for optimum performance. If the output voltage is higher than 1. Once ILR is selected, L can be determined by: To ensure that the on-time is larger than the minimum limit, which is ns, the value of R1 must satisfy the following equation: Protection features include datashwet over-voltage protection, thermal shutdown, VCC undervoltage lock-out, gate drive under-voltage lock-out.

No TI components are authorized for datasheer in FDA Class III or similar life-critical medical equipment unless authorized officers of the parties have executed a special agreement specifically governing such datadheet.

Headline Bold Ipsum lorem Headline Light. The capacitor at the SS pin determines the soft-start time, that is, the time for the dahasheet voltage at the regulation comparator and the output voltage to reach their final value. Experimentation is usually necessary to determine the minimum value for the output capacitor, as the nature of the load may require a larger value.