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Truman

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  1. The datasheet lists their thermal resistance differences. ==> Thank you. The temperature of the OPA445AP is quite high.
  2. Dear all, i have two questions about the OPA445. First, about the "package-lead", there are 4 kind of the package, "DIP-8", "SO-8 Surface-Mount", "SO-8 PowerPAD" and "TO-99 8-Pin". What's the difference in the performance between these 4 kinds of the package? The second question is, recently, I bought a OPA445AP to design a power amplifier. The power amplifier is chose to be inverting power amplifier. The input resistor and output resistor are 3M Ohm and 12M Ohm, so the gain is 12M/3M=4 if neglecting the minus sign. According to the datasheet of OPA445, the supply voltages of OPA445 could as high as +/- 45V. However, when applying +/- 40V, in addition to the output signal is disappeared from the oscillator scope, the temperature of the OPA445AP is quite high. But, when applying +/-30V, the performance is quite well and the temperature is moderate. So, what's the problem in the OPA445 or my circuit ? Is anyone can help me? Thank you very much. Truman
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