This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5050-2: LM5050 not provide enough Volts on Gate(charge pump not work correct)

Part Number: LM5050-2
Other Parts Discussed in Thread: LM5050-1

Schematic is look like this: Q12 is CSD19506 or CSD19505

Gate Charge Total (10 V) 120nC
Gate Charge Gate to Drain 20 nC
Drain-to-Source On Resistance VGS = 10 V 2.0 mΩ

Offset is ~4-5 V above Vin.

2 test:. I removed pool-down resistor to verify if have some changes. The same issue.

3 Test. I add a 100Ohm from gate of lm5050 to gate of Mossfet. The same result.

4. I cut line between gate of lm5050 and Gate of mossfet. Here I have 14-16V Offset.

I tried with 2 chips. Thes same results. 

On monday I can provide picture from oscilloscope to confirm my investigation.

please give me any suggestion.

thanks.