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LM137KG-MW8 bảng dữ liệu(PDF) 10 Page - Texas Instruments

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LM137, LM337-N
SNVS778E – MAY 1999 – REVISED JANUARY 2016
www.ti.com
Feature Description (continued)
LM137
VOUT = −10 V
VIN − VOUT = −40 V
IL = 0 A → 0.25 A → 0 A
Horizontal sensitivity, 20 ms/div
Figure 14. Output Drift (10-W Pulse for 100 ms)
7.4 Device Functional Modes
7.4.1 Protection Diodes
When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to
prevent the capacitors from discharging through low current points into the regulator. Most 10-
μF capacitors have
low enough internal series resistance to deliver 20-A spikes when shorted. Although the surge is short, there is
enough energy to damage parts of the IC.
When an output capacitor is connected to a negative output regulator and the input is shorted, the output
capacitor pulls current out of the output of the regulator. The current depends on the value of the capacitor, the
output voltage of the regulator, and the rate at which VIN is shorted to ground.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
when either the input, or the output, is shorted. Figure 15 shows the placement of the protection diodes.
10
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