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LM137HVQML Arkusz danych(PDF) 5 Page - Texas Instruments

Numer części LM137HVQML
Szczegółowy opis  LM137HVQML 3-Terminal Adjustable Negative Regulators (High Voltage)
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LM137HVQML Arkusz danych(HTML) 5 Page - Texas Instruments

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LM137HVQML
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SNVS314A – DECEMBER 2010 – REVISED APRIL 2013
Schematic Diagram
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 especially 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 coefficient, 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 VOUT, 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 4, a typical LM137HV's output drifts only 3 mV (or 0.03% of VOUT = −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 shows a 3 mV step as the LM137HV chip cools off. Note that the load regulation error of about 8 mV
(0.08%) is additional to the thermal regulation error. In Figure 5, 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).
Copyright © 2010–2013, Texas Instruments Incorporated
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