NASA Office of Logic Design

A scientific study of the problems of digital engineering for space flight systems,
with a view to their practical solution.

MS Kennedy 5920-1.5 LVDO SEE Test

Figure 1.  MS Kennedy 5920-1.5 LVDO Regulator.
For reference, lead pitch is 0.1" (nominal).

Note that the data sheet mentions, in the "OUTPUT CAPACITOR SELECTION" section that the output capacitors are required to maintain regulation and stability.  A test with no output capacitance and a DC load did result in rail-to-rail oscillation, as shown in Figure 2, below.  FOLLOW THE MANUFACTURER'S INSTRUCTIONS OR ELSE!!

Figure 2.  MS Kennedy 5920-1.5 LVDO Regulator with no output capacitance.
V_IN = 3.3V.  Note rail to rail output swings, from ~0.5V to ~3.3V.

Figure 3.  Radiation test board configured with two 5920-1.5 LVDO regulators.

SEE Test Report

SEE Test Report (October, 2005) 

Synopsis: This testing is a preliminary survey of the single event destructive and transient susceptibility of the MSK5920-1.5RH low voltage dropout voltage regulator. The device was monitored for transient interruptions in the output signal and for destructive events induced by exposing it to a heavy ion beam at the Texas A&M University Cyclotron Single Event Effects Test Facility. The sample size of the testing was two devices with a lot date code of 51651. The device is a hybrid device containing 2 active circuits, one bipolar transistor and one bipolar control circuit.

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Last Revised: October 31, 2005
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