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LMH6554LEX/NOPB Datasheet(PDF) 17 Page - Texas Instruments |
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LMH6554LEX/NOPB Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 24 page  VCM V + 10 PF 0.1 PF + - 0.1 PF 0.01 PF 0.01 PF VEN -OUT +OUT +IN -IN LMH6554 LMH6554 www.ti.com SNOSB30O – OCTOBER 2008 – REVISED MARCH 2013 Figure 38. Single Supply Bypassing Capacitors Power Dissipation The LMH6554 is optimized for maximum speed and performance in a small form factor 14 lead UQFN package. To ensure maximum output drive and highest performance, thermal shutdown is not provided. Therefore, it is of utmost importance to make sure that the TJMAX is never exceeded due to the overall power dissipation. Follow these steps to determine the maximum power dissipation for the LMH6554: 1. Calculate the quiescent (no-load) power: PAMP = ICC * (VS) where • VS = V + − V-. (Be sure to include any current through the feedback network if V CM is not mid-rail) (1) 2. Calculate the RMS power dissipated in each of the output stages: PD (rms) = rms ((VS − V+OUT) * I+OUT) + rms ((VS − V-OUT) * I-OUT) where • VOUT and IOUT are the voltage • the current measured at the output pins of the differential amplifier as if they were single ended amplifiers • VS is the total supply voltage (2) 3. Calculate the total RMS power: PT = PAMP + PD (3) The maximum power that the LMH6554 package can dissipate at a given temperature can be derived with the following equation: PMAX = (150° − TAMB)/ θJA where • TAMB = Ambient temperature (°C) • θJA = Thermal resistance, from junction to ambient, for a given package (°C/W) • For the 14 lead UQFN package, θJA is 60°C/W (4) NOTE If VCM is not 0V then there will be quiescent current flowing in the feedback network. This current should be included in the thermal calculations and added into the quiescent power dissipation of the amplifier. Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: LMH6554 |
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