TS1100-50EG5 datasheet(6/20 Pages) SILABS

부품명	TS1100-50EG5

상세설명	High Side Bidirectional and Unidirectional Current Sense Amplifier

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2.4 Choosing the Sense Resistor

Selecting the optimal value for the external RSENSE is based on the following criteria and for each commentary follows:

1. RSENSE Voltage Loss

2. VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE

3. Total ILOAD Accuracy

4. Circuit Efficiency and Power Dissipation

5. RSENSE Kelvin Connections

2.4.1 RSENSE Voltage Loss

For the lowest IR power dissipation in RSENSE, the smallest usable resistor value for RSENSE should be selected.

2.4.2 VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE

As there is no separate power supply pin for the current-sense amplifiers, the circuit draws its power from the voltage at its RS+ and

RS- terminals. Therefore, the signal voltage at the OUT terminal is bounded by the minimum voltage applied at the RS+ terminal.

Therefore:

VOUT (max ) = VRS+(min ) − VSENSE(max ) − VOH (max )

and

RSENSE <

VOUT (max )

GAIN × ILOAD(max )

where the full-scale VSENSE should be less than VOUT(MAX)/GAIN at the application’s minimum RS+ terminal voltage. For best perform-

ance with a 3.6 V power supply, RSENSE should be chosen to generate a VSENSE of: a) 120 mV (for the 25 V/V GAIN option), b) 60 mV

(for the 50 V/V GAIN option), c) 30 mV (for the 100 V/V GAIN option), or d) 15 mV (for the 200 V/V GAIN option) at the full-scale ILOAD

current in each application. For the case where the minimum power supply voltage is higher than 3.6 V, each of the four full-scale

VSENSEs above can be increased.

2.4.3 Total Load Current Accuracy

In the current-sense amplifiers’ linear region where VOUT < VOUT(max), there are two specifications related to the circuit’s accuracy: a)

the input offset voltage and b) gain error (GE(max) = 0.6%). An expression for the current sense amplifiers’ total error is given by:

VOUT = GAIN × (1 ± GE) × VSENSE ± (GAIN × VOS)

A large value for RSENSE permits the use of smaller load currents to be measured more accurately because the effects of offset voltag-

es are less significant when compared to larger VSENSE voltages. Due care though should be exercised as previously mentioned with

large values of RSENSE.

2.4.4 Circuit Efficiency and Power Dissipation

IR losses in RSENSE can be large especially at high load currents. It is important to select the smallest, usable RSENSE value to mini-

mize power dissipation and to keep the physical size of RSENSE small. If the external RSENSE is allowed to dissipate significant power,

then its inherent temperature coefficient may alter its design center value, thereby reducing load current measurement accuracy. Pre-

cisely because the current-sense amplifiers input stages were designed to exhibit a very low input offset voltage, small RSENSE values

can be used to reduce power dissipation and minimize local hot spots on the PCB.

TS1100/01/02/03 Data Sheet

System Overview

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Rev. 1.0 | 5

유사한 부품 번호 - TS1100-50EG5

제조업체	부품명	데이터시트	상세설명
Touchstone Semiconducto...	TS1100-50	771Kb / 11P	A 1uA, 2V to 25V SOT23 Precision Current-Sense Amplifier
Silicon Laboratories	TS1100-50-EG6	63Kb / 1P	This change is considered a minor change which does not affect form, fit, function, quality, or reliability.
Silicon Laboratories	TS1100-50-EG6T	63Kb / 1P	This change is considered a minor change which does not affect form, fit, function, quality, or reliability.

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유사한 설명 - TS1100-50EG5

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