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LM137 Folha de dados(PDF) 7 Page - STMicroelectronics |
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LM137 Folha de dados(HTML) 7 Page - STMicroelectronics |
7 / 14 page Figure 1. Figure 2. When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the in- dividual IC circuit components. With an IC regulator, this gradient can be especially severe since power dissipation is large. Thermal regulation is the effect of these tempera- ture gradients on output voltage (in percentage out- put change) per watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or temperature coefficient, and occurs within 5ms to 50ms after a change in power dissipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regu- lation of a voltage regulator is defined as the per- centage change of VO, per watt, within the first 10ms after a step of power, is applied. The LM137 specification is 0.02 %/W max.In figure 1, a typical LM337’s output drifts only 3mV for 0.03% of VO = – 10V) when a 10W pulse is applied for 10ms. This performance is thus well inside the spe- cification limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is ended the thermal regulation again shows a 3mV step as the LM137 chip cools off. Note that the load regulation error of about 8mV(0.08%) is additional to the thermal regulation error. In figure 2, when the 10W pulse is applied for 100ms, the output drifts only slightly beyond the drift in the first 10ms and the thermal error stays well within 0.1% (10mV). LM 337, V0 = – 10V VI –V0 = – 40V IL =0A → 0.25A → 0A Vertical sensitivity 5mV/div. LM 337, V0 = – 10V VI –V0 = – 40V IL =0A → 0.25A → 0A Horizontal sensitivity 20msN/div. THERMAL REGULATION LM137-LM237-LM337 7/14 |
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