Compound Gate Drivers

Gideon Analytical Laboratories received four National LM5111-1m dual 5A compound gate drivers. There were two bad devices and two good ones for comparison. A gate driver is a power amplifier that accepts a low-power input from a controller IC and produces a high current drive input for the gate of a high-power transistor. They consist of a level shifter in combination with an amplifier. They can power IGBTs and MOSFETs. They can help control electronics that need higher power than the PWM signals can generate. No information was given to Gideon Analytical Laboratories about the nature or cause of these failing National LM5111-1m dual 5A compound gate drivers.

Failure analysis was performed. There was no mechanical damage to the plastic or the lead frame of the 8-pin SOIC gate driver. All the devices were electrically tested on a curve tracer to determine the condition of each lead. Both the failed devices had dead shorts in similar locations, respectively. Both failed sites had burn marks, which were caused by an excessive voltage on the supply line.

Gideon Analytical Laboratories is one of the premier electronic failure analysis laboratories in the United States of America. We solve problems with semiconductors, all types of capacitors, resistors, diodes, transformers, and many more. In short, if it has electrical current running through it and it fails, Gideon Analytical Laboratories is the place to call. Rates charged for failure analysis is extremely low compared to the costs companies can save by preventing future failures. Save time, save money, acquire peace of mind knowing your products are reliable.

expoxy pyrolysis

expoxy pyrolysis

failure sites

failure sites

failure; dead short from Vcc to Vee

failure; dead short from Vcc to Vee

package after decapsulation

package after decapsulation

National LM5111-1M dual 5A compound gate driver

National LM5111-1M dual 5A compound gate driver

Problem area is circled

Problem area is circled