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LMG1210: HO problem under PWM mode

Part Number: LMG1210

Hi team,

Customer is testing our LMG1210, but they meet some problem while test.

They now set the LMG1210 to PWM mode, the EN/HI pin is connected to the 5V supply, the signal generator generates a 5V, 2.5MHz, 50% pulse signal to drive the PWM/LI. Both signals have a 20K pull-down resistor.

After power-on, they measured the HO/LO output signal of the LMG1210. HO is always 10V level, but the signal of LO is normal, as follows:

But then, customer changed the decoupling capacitor value of VDD from 100nF to 10uF, and the output value of HO became 5V. At this time, the output of LO is normal as follows:

The schematic is:

They suspect that the chip is broken. We tried to replace the chip ourselves, but the result is that the output of the LO is not normal. The output frequency of the LO signal is the same as the input frequency, but the duty cycle is completely wrong., which turned into a very narrow pulse. The output signal of HO is completely turned low.

Customer wants to know how high the temperature of this chip can withstand during soldering, and how long it will cause the chip to break down at high temperatures. When they change the chip, the temperature of the heat gun used is 400 degrees Celsius, and the time of using the heat gun may be 1 to 2 minutes. Whether such conditions will cause the chip to break?

Do you have any suggestion to debug this problem?

Thanks and best regards,

Marc