SNVS778D – MAY 1999 – REVISED APRIL 2013
LM137, V
OUT
=
−10V
V
IN
−
V
OUT
=
−40V
I
IL
= 0A
→
0.25A
→
0A
Vertical sensitivity, 5 mV/div
Figure 3.
In
a typical LM137'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 × 10W = 0.2% max. When the
10W pulse is ended, the thermal regulation again shows a 3 mV step at the LM137 chip cools off. Note that the
load regulation error of about 8 mV (0.08%) is additional to the thermal regulation error. In
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).
LM137, V
OUT
=
−10V
V
IN
−
V
OUT
=
−40V
I
L
= 0A
→
0.25A
→
0A
Horizontal sensitivity, 20 ms/div
Figure 4.
6
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