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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM333K bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI) |
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LM333K bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI) |
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6 / 8 page  Typical Applications (Continued) 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 the 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 50ms 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 LM333’s specification is 0.01%/W, max. In Figure 1, a typical LM333’s output drifts only 2mV (or 0.02% of V OUT = −10V) when a 20W pulse is applied for 10 ms. This performance is thus well inside the specification limit of 0.01%/Wx20W = 0.2% max. When the 20W pulse is ended, the thermal regulation again showsa2mV step as the LM333 chip cools off. Note that the load regulation error of about 1 mV (0.01%) is additional to the thermal regulation error. In Figure 2, when the 20W pulse is applied for 100 ms, the output drifts only slightly beyond the drift in the first 10ms, and the thermal error stays well within 0.1% (10mV). Adjustable Lab Voltage Regulator DS009065-12 *The 10 µF capacitors are optional to improve ripple rejection. Adjustable Current Regulator DS009065-13 *0.5 Ω≤ R1 ≤ 24Ω DS009065-14 FIGURE 1. www.national.com 6 |
Số phần tương tự - LM333K |
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Mô tả tương tự - LM333K |
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