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OPA544T Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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OPA544T Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 8 page ® 6 OPA544 TYPICAL PERFORMANCE CURVES (CONT) APPLICATIONS INFORMATION Figure 1 shows the OPA544 connected as a basic non- inverting amplifier. The OPA544 can be used in virtually any op amp configuration. Power supply terminals should be bypassed with low series impedance capacitors. The tech- nique shown, using a ceramic and tantalum type in parallel is recommended. Power supply wiring should have low series impedance and inductance. The safe output current decreases as VS–VO increases. Output short-circuits are a very demanding case for SOA. A short-circuit to ground forces the full power supply voltage (V+ or V–) across the conducting transistor. With VS = ±35V the safe output current is 1.5A (at 25˚C). The short-circuit current is approximately 4A which exceeds the SOA. This situation will activate the thermal shutdown circuit in the OPA544. For further insight on SOA, consult Application Bulletin AB-039. SAFE OPERATING AREA Stress on the output transistors is determined by the output current and the voltage across the conducting output transis- tor, VS–VO. The power dissipated by the output transistor is equal to the product of the output current and the voltage across the conducting transistor, VS–VO. The Safe Operating Area (SOA curve, Figure 2) shows the permissible range of voltage and current. FIGURE 1. Basic Circuit Connections. At T CASE = +25°C, VS = ±35V, unless otherwise noted. 5V/div G = 1+ = 3 R 2 R 1 + Z L V O R 2 10k Ω R 1 5k Ω 0.1µF 10µF OPA544 V– –35V +35V V+ V IN + 10µF 0.1µF 200MV/div SMALL SIGNAL RESPONSE G = 3, C L = 1nF 2µs/div FIGURE 2. Safe Operating Area. 12 5 10 |V S – VO| (V) 20 50 100 SAFE OPERATING AREA 10 4 1 0.4 0.1 Current-Limited T C = 25°C T C = 125°C T C = 85°C Output current may be limited to less than 4A—see text. CURRENT LIMIT The OPA544 has an internal current limit set for approxi- mately 4A. This current limit decreases with increasing junction temperature as shown in the typical curve, Current Limit vs Temperature. This, in combination with the thermal shutdown circuit, provides protection from many types of overload. It may not, however, protect for short-circuit to ground, depending on the power supply voltage, ambient temperature, heat sink and signal conditions. |
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Similar Description - OPA544T |
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