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LM5116: LM5116 Failure

simone frasanni
Intellectual 285 points
Part Number: LM5116

Hi to all,

Is there any possibility to damage internal regulator of LM51116 ?

I fed VCCX with output voltage of 13V, and VCC with input voltage of 20..40Vdc.

I utilize LM5116 to charge a lead acid battery : when battery is very low voltage, the LM5116 works in current limit condition. If the input voltage ripple is high (about 5Vpp) the IC LM5116 will damage..

With LM5116 broken, I found Vin on VCC pin , and 0V in VCCx.

Can someone suggest me some tricks ? I read on datasheet it is useful to put a diode between Vin and Vcc to prevent reverse discharge of VCCx when it is higher than Vin.

Thank

Regards

Simone

  • 0
    TI__Genius 13700 points
    Hello Simone,

    Yes, the internal LDO off the VCC pin can be damaged with too much voltage.
    Looking at the datasheet specifically at Section 6.1 it states that the Absolute Maximum voltage that can be placed on VCC is 16V.

    That said VIN and VCC are very different. VIN is capable of supporting the full 100V input range of the part.

    With all that said there is an internal regulator between VIN and VCC such that VCC should not be connected to any external voltage source since there is an internal LDO in the LM5116 stepping the input voltage down to a safe voltage for VCC.