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LM337-N 数据表(PDF) 8 Page - Texas Instruments |
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LM337-N 数据表(HTML) 8 Page - Texas Instruments |
8 / 20 page ( ) OUT ADJ R V V I R 2 1.25 1 2 120 æ ö - = - + + - ´ ç ÷ è ø 8 LM337-N-MIL SNVSAX3 – JUNE 2017 www.ti.com Product Folder Links: LM337-N-MIL Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview In operation, the LM337-N-MIL develops a nominal −1.25-V reference voltage between the output and adjustment terminal. The reference voltage is impressed across program resistor R1 (120 Ω for example) and, because the voltage is constant, a constant current then flows through the output set resistor R2, giving an output voltage calculated by Equation 1. (1) 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Thermal Regulation When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the individual IC circuit components. With an IC regulator, this gradient can be especially severe because power dissipation is large. Thermal regulation is the effect of these temperature gradients on output voltage (in percentage output change) per Watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or temperature coefficient, and occurs within 5 ms to 50 ms after a change in power dissipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regulation of a voltage regulator is defined as the percentage change of VOUT, per Watt, within the first 10 ms after a step of power is applied. |
类似零件编号 - LM337-N |
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类似说明 - LM337-N |
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