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Posts by kellogs‭

7 posts
75%
+4 −0
Q&A Power switches and automotive load dump, unclamped

Power switches used in automotive are usually rated to withstand clamped load dump events, of the 35 - 40 V peak variety. AFAICT there are two main clamping mechanisms - first one for the logic par...

2 answers  ·  posted 1y ago by kellogs‭  ·  last activity 1y ago by TonyStewart‭

71%
+3 −0
Q&A MOSFET protection with TVS: at the source pin or at the drain pin

In the auotmotive context, does it matter where the fat load-dump grade diode is placed in relation to the MOSFET so as to protect it from both fast positive transients and the longer load dump ? ...

2 answers  ·  posted 1y ago by kellogs‭  ·  last activity 1y ago by Lundin‭

71%
+3 −0
Q&A Two way circuit breaking capability for ideal diode controllers

I would like to save some costs with ideal diode controllers. Basic requirement is for the diode controller to block overcurrents (short circuits) in both directions. The MAX16141A IC can do it a...

1 answer  ·  posted 1y ago by kellogs‭  ·  edited 1y ago by kellogs‭

66%
+2 −0
Q&A what should the output be for this use case of the CD4047 chip?

Hello, I am trying to use a CD4047 in monostable, positive-edge trigger mode: I am not skilled enough to make out what the output, i.e. pin 10, should be when pin 8, the input, is held at 0V (...

1 answer  ·  posted 1y ago by kellogs‭  ·  edited 1y ago by kellogs‭

66%
+2 −0
Q&A Variant of a Mosfet's Gate-Source protection

Let's say a 100V voltage spike arrives at +12V and the TVS diode clamps it to 25V. Q2 may or may not be activated. Will this circuit ensure a V_gs lower than 25V for the mosfet Q1 ? Any catch to it...

1 answer  ·  posted 1y ago by kellogs‭  ·  last activity 1y ago by Olin Lathrop‭

60%
+1 −0
Q&A derating MLCC ripple current for transient current spikes

This graph - MLCC temperature rise vs ripple current RMS & frequency If I had a 10 us current spike every 100 000 us (akin to a half-sine wave and then the rest of 9999 sine waves missing), ...

2 answers  ·  posted 1y ago by kellogs‭  ·  last activity 1y ago by TonyStewart‭

33%
+1 −4
Q&A Floating circuitry and diodes

In both cases, is the "X" point floating when there is no 12V applied ?

1 answer  ·  posted 1y ago by kellogs‭  ·  edited 1y ago by Lorenzo Donati‭