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.

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This user’s guide details lm3120 design of a demonstration board which provides a 3. Headline Bold Ipsum lorem Headline Light. Protection features include output over-voltage protection, thermal shutdown, VCC undervoltage lock-out, gate drive under-voltage lock-out.

Once ILR is selected, L can be determined by: Buyers are responsible for their products and applications using TI components.

LM3102 PDF Datasheet浏览和下载

Reproduction of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Calculate the on-time setting resistor The switching frequency fSW of the demonstration board is affected by the on-time ton of the LM, which is determined by R1.

In some cases, TI components may be promoted specifically to facilitate safety-related applications. Low ESR also helps ensure a complete recharge during each off-time. Buyer acknowledges and agrees that it is solely responsible for compliance catasheet all legal, regulatory and safety-related requirements concerning its products, and any datashet of TI components in its applications, notwithstanding any applications-related information or support that may be provided by TI.

Nonetheless, such components are subject datasueet these terms. 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. Determine the inductance The main parameter affected by the inductor is the dstasheet of the inductor current ripple ILR.


LM Datasheet(PDF) – National Semiconductor (TI)

It then drops to zero at turn-off. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.

The bootstrap capacitor C4 should be connected as close to the SW and BST pins as possible, and the connecting traces should be thick. The design of the demonstration board is detailed below.

In this demonstration board, a 10 nF capacitor is used. Information published by TI regarding third-party products or services does not constitute a license to use such products or services or a warranty or endorsement thereof. For a worst case calculation, the input capacitor must be capable of supplying this average load current during the maximum on-time.

The capacitor at the SS pin determines the soft-start time, that is, the time for the reference voltage at the regulation comparator and the output voltage to reach their final value.

A low ESR 0. TI is not responsible or liable for any such statements. Products Applications Audio www. Except where mandated by applicable law, testing of all parameters of each component is not necessarily performed. The time is determined from the following equation: Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

The input capacitor is calculated from: Vias should be added to connect the ground of the input capacitors to a ground plane, located as close to the capacitor as possible. TI is not responsible or liable for such altered documentation.

C8 should be no smaller than nF for stability, and should be a good quality, low ESR, ceramic capacitor. I wish to measure a very low resistance of the order of an ohm. Lab 6 in this note. Layout is therefore critical for optimum performance.


The operating frequency remains constant with line variations due to the inverse relationship between the input voltage and the on-time.

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. To ensure that the on-time is larger than the minimum limit, which is ns, the value of R1 must satisfy satasheet following equation: The output capacitor C10, C11 should be connected close to the load and tied directly to the ground plane.

The exposed datasueet on the bottom of the LM IC package can be soldered to the ground plane, which should extend out from beneath the LM to help dissipate heat.

The demonstration board schematic, PCB layout, Bill of Materials, and circuit design descriptions are shown. Buyer represents and agrees that it has all datashheet necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm and take appropriate remedial actions.

The average current during the on-time is the load current. Experimentation is usually necessary to determine the minimum value for the output capacitor, as the nature of the load may require a larger value. 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 lm312.

If the output voltage is higher than 1.

Information of third parties may be subject to additional restrictions.

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