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LM109JAN Fiches technique(PDF) 6 Page - Texas Instruments

No de pièce LM109JAN
Description  LM109JAN 5-Volt Regulator
Download  13 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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LM109JAN Fiches technique(HTML) 6 Page - Texas Instruments

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OBSOLETE
LM109JAN
SNVS379B – NOVEMBER 2005 – REVISED MARCH 2013
www.ti.com
Application Hints
1. Bypass the input of the LM109 to ground with
≥ 0.2 μF ceramic or solid tantalum capacitor if main filter
capacitor is more than 4 inches away.
2. Avoid insertion of regulator into “live” socket if input voltage is greater than 10V. The output will rise to
within 2V of the unregulated input if the ground pin does not make contact, possibly damaging the load. The
LM109 may also be damaged if a large output capacitor is charged up, then discharged through the internal
clamp zener when the ground pin makes contact.
3. The output clamp zener is designed to absorb transients only. It will not clamp the output effectively if a
failure occurs in the internal power transistor structure. Zener dynamic impedance is
≈ 4Ω. Continuous RMS
current into the zener should not exceed 0.5A.
4. Paralleling of LM109s for higher output current is not recommended. Current sharing will be almost
nonexistent, leading to a current limit mode operation for devices with the highest initial output voltage. The
current limit devices may also heat up to the thermal shutdown point (
≈ 175°C). Long term reliability cannot
be ensured under these conditions.
5. Preventing latchoff for loads connected to negative voltage:
If the output of the LM109 is pulled negative by a high current supply so that the output pin is more than 0.5V
negative with respect to the ground pin, the LM109 can latch off. This can be prevented by clamping the ground
pin to the output pin with a germanium or Schottky diode as shown. A silicon diode (1N4001) at the output is also
needed to keep the positive output from being pulled too far negative. The 10
Ω resistor will raise +VOUT by ≈
0.05V.
Crowbar Overvoltage Protection
Figure 3. Input Crowbar
6
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