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LMP8480 Datasheet(PDF) 10 Page - Texas Instruments |
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LMP8480 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page .01 .1 1 10 .001 .01 .1 1 10 SOURCING CURRENT (mA) VCC= 12V -40°C +25°C +85°C +125°C .01 .1 1 10 .001 .01 .1 1 10 SINKING CURRENT (mA) VCC= 12V -40°C +25°C +85°C +125°C .01 .1 1 10 .001 .01 .1 1 10 SINKING CURRENT (mA) VCC= 5V -40°C +25°C +85°C +125°C .01 .1 1 10 .001 .01 .1 1 10 SOURCING CURRENT (mA) VCC= 5V -40°C +25°C +85°C +125°C LMP8480, LMP8481 SNVS829A – JUNE 2012 – REVISED AUGUST 2012 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, TA = 25°C, VCC= 4.5V to 76V, 4.5V < VCM < 76V, RL= 100k, VSENSE = (VR SP – V RSN) = 0V, for all gain options. Saturated Output Sourcing Current at 4.5V Saturated Output Sinking Current at 4.5V Saturated Output Sourcing Current at 12V Saturated Output Current Sinking at 12V Application Information LMP8480 AND LMP8481 INTRODUCTION The LMP8480 and LMP8481 are single supply, high side current sense amplifiers with available fixed gains of x20, x50, x60 and x100. The power supply range is 4.5V to 76V, while the common mode input voltage range is capable of 4.0V to 76V operation. The supply voltage and common mode range are completely independent of each other. This makes the LMP848x supply voltage extremely flexible, as the LMP848x's supply voltage can be greater than, equal to, or less than the load source voltage, and allowing the device to be powered from the system supply or the load supply voltage. The amplifier supply voltage does not have to be larger than the load source voltage. A 76V load source voltage with a 5V LMP8481 supply voltage is perfectly acceptable. THEORY OF OPERATION The LMP8480 and LMP8481 are comprised of two main stages. The first stage is a differential input current to voltage converter, followed by a differential voltage amplifier and level-shifting output stage. Also present is an internal 14 Volt Low Dropout Regulator (LDO) to power the amplifiers and output stage, as well as a reference divider resistor string to allow the setting of the reference level. As seen in Figure 7, the current flowing through RSENSE develops a voltage drop called VSENSE. The voltage across the sense resistor, VSENSE, is then applied to the input RSP and RSN pins of the amplifier. 10 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LMP8480 LMP8481 |
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