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OPA445BM Datasheet(PDF) 10 Page - Texas Instruments |
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OPA445BM Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 25 page  OPA445 SBOS156B − MARCH 1987 − REVISED APRIL 2008 www.ti.com 10 SAFE OPERATING AREA Stress on the output transistors is determined both by the output current and by the output voltage across the conducting output transistors, 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 6 through Figure 10) illustrates the permissible range of voltage and current. The curves shown represent devices soldered to a printed circuit board (PCB) with no heat sink. Increasing printed circuit trace area or the use of a heat sink (TO-99 package) can significantly reduce thermal resistance ( q ), resulting in increased output current for a given output voltage (see Figure 11, Figure 12, and the Heat Sink section). 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 and produces a typical output current of 25mA. With ±40V power supplies, this creates an internal dissipation of 1W. This exceeds the maximum rating and is not recommended. If operation in this region is unavoidable, a heat sink is required. For further insight on SOA, consult Application Bulletin SBOA022 (available for download at www.ti.com). 12 5 10 |V S| − |VO|(V) 20 50 100 T A =25_ C T A = 120_ C T A =85_ C T A +[(|VS| − |VO|) IO ×θJA] ≤ TJ (max) θ JA = 100_ C/W T J (max) = 125_ C 100 10 1 0.1 Figure 6. DIP-8 Safe Operating Area 12 5 10 |V S| − |VO|(V) 20 50 100 100 10 1 0.1 T A =25_ C T A =85_ C T A = 125_ C T A +[(|VS| − |VO|) IO ×θJA] ≤ TJ (max) θ JA = 200_ C/W (No Heat−Sink) T J (max) = 150_ C NOTE: Simple clip−on heat−sinks can reduce θ by as much as 50_C/W. Figure 7. TO-99 Safe Operating Area 12 5 10 |V S| − |VO|(V) 20 50 100 100 10 1 0.1 T A =85_ C T A = 120_ C T A +[(|VS| − |VO|) IO ×θJA] ≤ T J (max) θ JA = 150_ C/W T J (max) = 125_ C T A =25_ C Figure 8. SO-8 (non PowerPAD) Safe Operating Area 110 |V S| − |VO|(V) 100 100 10 1 0.1 T A =25_ C T A =85_ C T A =120_ C T A +[(|VS| − |VO|) IO ×θJA] ≤ TJ (max) θ JA =96_ C/W T J (max) = 125_ C Figure 9. SO-8 PowerPAD Safe Operating Area (no heat-spreader, no airflow) |
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