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TLC2274CPWR.B 数据表(PDF) 26 Page - Texas Instruments |
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TLC2274CPWR.B 数据表(HTML) 26 Page - Texas Instruments |
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26 / 61 page ![]() g OUT S Load R V R I R = ´ ´ 1 1 2 g g g 2 OUT BAT S Load 1 1 2 2 R 1 R R R 1 2 R R R R R V V R I R R R 1 1 R R æ ö æ ö ç ÷ + + ç ÷ - ç ÷ ç ÷ è ø = ´ + ´ ´ ç ÷ ç ÷ + + ç ÷ ç ÷ è ø 1 1 2 g g g 2 1 2 OUT 1 2 1 1 2 2 R 1 R R R 1 2 R R R R R V V V (V V ) R R R 2 1 1 R R æ ö æ ö ç ÷ + + ç ÷ - ç ÷ ç ÷ + è ø = ´ + - ç ÷ ç ÷ + + ç ÷ ç ÷ è ø _ + RS V1 V2 VBAT R1 VOUT ILOAD ILOUD R2 0.1 µF R Rg 47 k 26 TLC2272, TLC2272A, TLC2272M, TLC2272AM TLC2274, TLC2274A, TLC2274M, TLC2274AM SLOS190H – FEBRUARY 1997 – REVISED MARCH 2016 www.ti.com Product Folder Links: TLC2272 TLC2272A TLC2272M TLC2272AM TLC2274 TLC2274A TLC2274M TLC2274AM Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated 8.2 Typical Application 8.2.1 High-Side Current Monitor Figure 60. Equivalent Schematic (Each Amplifier) 8.2.1.1 Design Requirements For this design example, use the parameters listed in Table 3 as the input parameters. Table 3. Design Parameters PARAMETER VALUE VBAT Battery Voltage 12 V RSENSE Sense Resistor 0.1 Ω ILOAD Load Current 0 A to 10 A Operational Amplifier Set in Differential configuration with Gain = 10 8.2.1.2 Detailed Design Procedure This circuit is designed for measuring the high-side current in automotive body control modules with 12-V battery or similar applications. The operational amplifier is set as differential with an external resistor network. 8.2.1.2.1 Differential Amplifier Equations Equation 1 and Equation 2 are used to calculate VOUT. (1) (2) In an ideal case R1 = R and R2 = Rg, and VOUT can then be calculated using Equation 3: (3) |
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