Hello,
On a DCDC converter we use LM5112Q1SD for drive the MOSFET bridge and it is work perfecly.
Before assembling the product, we test each board with flying prob and we measure the output impedance of the driver (OUT pin / VEE pin).
most of the time the measured value is high (>1M ohm) but sometimes the measured value is low (30K ohm).
I can't find in the datasheet infomration about output impedance value.
Can you tell me the min, max and type of this value.
Hello Antoine,
We don't spec the output impedance when the device is powered off. When the device is on, the output will either pull low or pull high, with no option for HI-Z:
My two guesses are either that the probe's polarity will determine the value measured, or that VCC is no being kept low. If a test current is injected into OUT while the device is off, there is a path to charge VDD through the device. It may cause VCC to rise and the driver to start to turn on (which would explain the resistance dropping).
Ultimately, this isn't something we spec, so I don't have data to share about the min, max, and typical value. If the customer would like OUT/VEE to be a well-defined resistance, they can use an Rgs pulldown resistor.
Thanks,
Alex M.
