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LM237SP Scheda tecnica(PDF) 7 Page - STMicroelectronics

Il numero della parte LM237SP
Spiegazioni elettronici  THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATORS
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
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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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