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DCH010515DN7 Failure when multiple power on test

S. Gaudreau
Intellectual 455 points

We use the DCH010515DN7 in our design.

The DCDC: is connected to 2.2 uF capacitor and then voltage regulator and the current draw on each voltage level is 3-4 mA.

We do a small power interruption test to check system stability.

500 times "ON / OFF / ON" cycles, 10-100 ms  OFF period and 60 seconds between tests.

The DC:DC breaks when we do the test, output voltage goes to 3V-4V rather than 15V in the steady state.

Here is the schematic associated...






Any idea anyone why the DC:DC fails ?




  • 0
    TI__Mastermind 38230 points

    Stephane:

    I reviewed the data and I have concern about the 10msec -100ms power cycle test for 500 cycles on 60 seconds. There are two(2) possible reasons for this failure.

    1. The short  power cycle tests is most likely generating a very high voltage transient  greater than  7V. The high input  dv/dt voltage on the input power circuit is exceeding the maximum 7Vin.

    2. Or  output +/- 15V  has shorted output  components.

    Can you measure the output resistance on digital meter set to Diode detect mode between Vout common pin  6  and pin 5  and then to pin 7. The meter polarity will have to be reversed   to detect any VR diode voltage?

    Tom

    You can sent this data directly to tguerin@ti.com