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OPA2541BM Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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OPA2541BM Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 8 page ® OPA2541 6 The internal current limit will not provide short-circuit protection in most applications. When the amplifier output is shorted to ground, the full power supply voltage is im- pressed across the conducting output transistor. For in- stance, with V S = ±35V, a short circuit to ground would impress 35V across the conducting power transistor. The maximum safe output current at this voltage is 1.8A, so the internal current limit would not protect the amplifier. The unit-to-unit variation and temperature dependence of the internal current limit suggest that it be used to handle abnormal conditions and not activated in commonly encoun- tered circuit operation. Reactive, or EMF generating loads such as DC motors can present demanding SOA requirements. With a purely reac- tive load, output voltage current occurs when the output voltage is zero and the voltage across the conducting transis- tor is equal to the full power supply voltage. See Burr- Brown Application Note AN-123 for further information on evaluating SOA. Applications with inductive or EMF-generating loads which can produce “kick back” voltage surges to the amplifiers should include clamp diodes from the output terminals to the power supplies. These diodes should be chosen to limit the peak amplifier output voltage surges to less than 2V beyond the power supply rail voltage. Common 1A rated rectifier diodes will suffice in most applications. APPLICATIONS CIRCUITS FIGURE 2. Clamping Output for EMF-Generating Loads. 0.1µF 0.1µF +35V –35V A V = 1 + R2/R1 = 5 R 2 10k Ω R 1 2.5k Ω V IN 30pF 0.5 Ω V O FIGURE 3. Isolating Capacitive Loads. FIGURE 1. Safe Operating Area. 0.1µF L 10µF 0.1µF 10µF +V S + –V S D 1 D 2 Inductive- or EMF- Generating Load D 1 – D2: IN4003 + FIGURE 4. Paralleled Operation, Extended SOA. A V = –R2/R1 = –10 20pF L 20pF R 2 100k Ω R 1 10k Ω 0.1 Ω 10k Ω 0.1 Ω B Slave A Master V IN 10 1.0 0.1 1 100 |V S – VOUT| (V) SAFE OPERATING AREA 10 T C = +25°C T C = +85°C T C = +125°C *Depending on temperature, maximum output may be restricted by internal current limit. See output current specifications and typical curves. * |
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