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LM9061: LM9061M not working

Part Number: LM9061

Dear support team, we are designing LM9061M with overcurrent 25A, but when we test the PCB, the output of Vgate = 5V, Vin = 8.2V, and Vsource = 3.7V, the mosfet does not work well, 

the on/off is an additional 5V. the Vgate = 5V is too low, the design is same as the datasheet(only mosfet is different). could you pls provide more technical support? cheers

  • Hi

       测试一下芯片Vcc脚的电压多少?(需稳定在7V以上)

     其次请问一共做了多少板子?  都这样吗? 

  • vcc是8.2v肯定没问题,但是芯片第六脚有5v,这个Vref貌似不对,电阻15.4k也确实没问题。另外芯片输出out到晶体管门级对地的电压有5v,晶体管输出到load竟然只有4点几v,load是10欧姆功率电阻。实在是找不到原因出在哪里,一模一样的电路图。

  • Hi

        Vref应该是1.2V.   OUT脚对MOS输出应该超过7V.

        从你描述看,有些像是芯片有问题,请问你芯片哪里买的? 做了几块板子都这样吗?

  • digi-key买的,按道理来说芯片应该没问题,但是我换了好几片,pin 6的引脚对地电压都是大于4V的。Vout输出电压跟pin7 On/OFF有关么?因为我发现Vout的电压会随着ON/OFF加的电压增加。

  • HI

        digi-key以前是TI授权代理商,按理说芯片不应该出现问题,但是从测试看完全不对,建议你通过其他渠道买芯片来确认下。(不要在淘宝,电子商场,建议直接找TI,或者是你们长期合作的渠道商)