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LM337IMP Scheda tecnica(PDF) 3 Page - National Semiconductor (TI) |
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LM337IMP Scheda tecnica(HTML) 3 Page - National Semiconductor (TI) |
3 / 12 page Electrical Characteristics (Note 1) (Continued) Note 4: Refer to RETS137H drawing for LM137H or RETS137K drawing for LM137K military specifications. Schematic Diagram 00906702 Thermal Regulation When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the individual IC circuit components. With an IC regulator, this gradient can be es- pecially severe since power dissipation is large. Thermal regulation is the effect of these temperature gradients on output voltage (in percentage output change) per Watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or temperature coeffi- cient, and occurs within 5 ms to 50 ms after a change in power dissipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regulation of a voltage regulator is defined as the percentage change of V OUT, per Watt, within the first 10 ms after a step of power is applied. The LM137’s specification is 0.02%/W, max. 00906703 LM137, VOUT = −10V VIN −VOUT = −40V IIL =0A → 0.25A → 0A Vertical sensitivity, 5 mV/div FIGURE 1. www.national.com 3 |
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