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LM337-N 数据表(PDF) 8 Page - Texas Instruments

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部件名 LM337-N
功能描述  3-Terminal Adjustable Negative Regulators
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM337-N 数据表(HTML) 8 Page - Texas Instruments

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OUT
ADJ
R
V
V
I
R
2
1.25
1
2
120
æ
ö
-
= -
+
+ -
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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.


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