TS1107-20ITQ1633 datasheet(6/22 Pages) SILABS

No de pièce	TS1107-20ITQ1633

Description	Power Management Systems

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2.7 Selecting a 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. Desired VSENSE and Applied Supply Voltage at VDD

3. Total ILOAD Accuracy

4. Circuit Efficiency and Power Dissipation

5. RSENSE Kelvin Connections

2.7.1 RSENSE Voltage Loss

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

2.7.2 VOUT Swing vs. Desired VSENSE and Applied Supply Voltage at VDD

Although the Current Sense Amplifier draws its power from the voltage at its RS+ and RS– terminals, the signal voltage at the OUT

terminal is provided by a buffer, and is therefore bounded by the buffer’s output range. As shown in the Electrical Characteristics table,

the CSA Buffer has a maximum and minimum output voltage of:

VOUT (max ) = VDD(min) − 0.2V

VOUT (min ) = 0.2V

Therefore, the full-scale sense voltage should be chosen so that the OUT voltage is neither greater nor less than the maximum and

minimum output voltage defined above. To satisfy this requirement, the positive full-scale sense voltage, VSENSE(pos_max), should be

chosen so that:

VSENSE(pos_max) <

VBIAS − VOUT (min )

GAIN

The negative full-scale sense voltage, VSENSE(neg_min), should be chosen so that:

VSENSE(neg_min ) <

VOUT (max ) − VBIAS

GAIN

For best performance, RSENSE should be chosen so that the full-scale VSENSE is less than ±75 mV.

2.7.3 Total Load Current Accuracy

In the TS1107/10’s linear region where VOUT(min) < VOUT < VOUT(max), there are two specifications related to the circuit’s accuracy: a)

the TS1107/10 CSA’s input offset voltage (VOS(max) = 150 μV), b) the TS1107/10 CSA’s gain error (GE(max) = 1%). An expression for

the TS1110’s total error is given by:

VOUT = VBIAS − 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.

2.7.4 Circuit Efficiency and Power Dissipation

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

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. Precisely

because the TS1107/10 CSA’s input stage was 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.

TS1107/10 Data Sheet

System Overview

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Rev. 1.0 | 5

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