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INA139NA Datasheet(PDF) 5 Page - Texas Instruments |
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INA139NA Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page ![]() INA139, INA169 5 SBOS181D www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, V+ = 5V, VIN+ = 12V, and RL = 25kΩ, unless otherwise noted. STEP RESPONSE 20 µs/div 1.5V G = 100 0.5V 1V G = 100 0V STEP RESPONSE 10 µs/div 1V G = 50 0V 2V G = 10 0V OPERATION Figure 1 shows the basic circuit diagram for both the INA139 and the INA169. Load current, IS, is drawn from the supply, VS, through the shunt resistor, RS. The voltage drop in the shunt resistor, VS, is forced across RG1 by the internal op amp, causing current to flow into the collector of Q1. The external resistor, RL, converts the output current to a voltage, VOUT, at the OUT pin. The transfer function for the INA139 is: IO = gm (VIN+) – (VIN–) (1) where gm = 1000µA/V (2) In the circuit of Figure 1, the input voltage, (VIN+) – (VIN–), is equal to IS • RS and the output voltage, VOUT, is equal to IO • RL. The transconductance, gm, of the INA139 is 1000 µA/V. The complete transfer function for the current measurement amplifier in this application is: VOUT = (IS) (RS) (1000µA/V) (RL) (3) FIGURE 1. Basic Circuit Connections. VOLTAGE GAIN EXACT RL (Ω) NEAREST 1% RL (Ω) 11k 1k 22k 2k 5 5k 4.99k 10 10k 10k 20 20k 20k 50 50k 49k 100 100k 100k Shunt R S INA139 2 1 OUT Q1 R L I O + V O – Load R G1 1k Ω R G2 1k Ω V IN+ V IN– 3 4 I S V+ 5 NOTE: (1) Maximum V P and V+ voltage is 60V with the INA169. V+ power can be common or independent of load supply. 2.7V ≤ (V+) ≤ 40V(1) V P Load Power Supply +2.7V to 40V(1) |
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