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LM883HVK Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM883HVK Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 10 page 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 espe- cially severe since power dissipation is large. Thermal regu- lation 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 inde- pendent of electrical regulation or temperature coefficient, and occurs within 5 ms to 50 ms after a change in power dis- sipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regulation of a voltage regula- tor is defined as the percentage change of V OUT, per Watt, within the first 10 ms after a step of power is applied. The LM137HV’s specification is 0.02%/W, max. In Figure 1, a typical LM137HV’s output drifts only 3 mV (or 0.03% of V OUT = −10V) when a 10W pulse is applied for 10 ms. This performance is thus well inside the specification limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is ended, the thermal regulation again showsa3mV step as the LM137HV chip cools off. Note that the load regulation er- ror of about 8 mV (0.08%) is additional to the thermal regu- lation error. In Figure 2, when the 10W pulse is applied for 100 ms, the output drifts only slightly beyond the drift in the first 10 ms, and the thermal error stays well within 0.1% (10 mV). Connection Diagram See Physical Dimensions section for further information) DS009066-3 LM137HV, VOUT = −10V VIN−VOUT = −40V IL = 0A→0.25A→0A Vertical sensitivity, 5 mV/div FIGURE 1. DS009066-4 LM137HV, VOUT = −10V VIN−VOUT = −40V IL = 0A→0.25A→0A Horizontal sensitivity, 20 ms/div FIGURE 2. TO-3 Metal Can Package DS009066-5 Bottom View Order Number LM137HVK/883, LM137HVK-QMLV, or SMD #7703404 See NS Package Number K02C Order Number LM337HVK STEEL See NS Package Number K02A TO-39 Metal Can Package DS009066-6 Bottom View Order Number LM137HVH/883, LM137HVH-QMLV, SMD #7703404 or LML337HVH See NS Package Number H03A www.national.com 4 |
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